Among the following compounds, a strong electrolyte is NaF. It gives its constituent ions Na+ and F- when dissolved in water.
What are electrolytes ?Electrolytes are molten or liquid substances containing ions which are free to move within the solution. There are two types of electrolytes namely strong electrolytes and weak electrolytes.
Strong electrolytes are those which are able to completely dissociates into its ions and thus conduct current. Weak electrolytes are weakly ionize or do not dissociates into its ions completely.
NaOH, KOH, NaCl , NaF etc are strong electrolytes. Whereas acetic acid, HF, water etc. are weak electrolytes. Strong ionic compounds are strong electrolytes too. Hence, NaF is the correct option.
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For the following materials, indicate the predominate cohesive force that binds the particles together to form a solid specimen (presuming each specimen is below its respective melting temperature). In other words, what is the predominate inter-particle bond for the materials listed below when they are present as solids. (Particle is generic for atom, ion, molecule.) Some options may be used more than once, or perhaps not at all Hint: These should be fairly obvious cases that you can hopefully answer with simple logic, and a basic knowledge of the periodic table Aluminum Choose ] Silicon Choose ] Lithium Fluoride (LiF) IChoose ] Neon Choose ] Water (again, not looking for the intramolecular bond here, but rather the intermolecular bond) Potassium Bromide (KBr) IChoose ] Brass (CopperZinc Alloy) IChoose ] Germanium Choose ] Silicon Carbide IChoose ] Octane Choose ]
The predominate inter-particle bond for each material is:
Aluminum - MetallicSilicon - CovalentLithium Fluoride (LiF) - IonicNeon - London KeesomWater - HydrogenPotassium Bromide (KBr) - IonicBrass (CopperZinc Alloy) - MetallicGermanium - CovalentSilicon Carbide - CovalentOctane - London KeesomThe cohesive forces that bind particles together in a solid material are determined by the nature of the atoms, ions, or molecules that make up the material. Some materials are composed of atoms that are held together by strong covalent bonds, whereas others are made up of ions that are attracted to each other by electrostatic forces.
Metallic materials have delocalized electrons that form a "sea" of electrons which hold the metal ions together. London Keesom forces are present in all materials, and arise from instantaneous dipoles that are formed in molecules. Hydrogen bonds are formed between molecules that have a hydrogen atom bonded to an electronegative atom.
By considering the nature of the constituent particles, it is possible to identify the predominant inter-particle bond that holds a solid material together.
This question should be provided with the options, which are: ebye, ionic, metallic, hydrogen, london keesom, covalent.
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NH4HS(s) ßà NH3(g) + H2S(g)For this reaction, ΔH° = + 93 kJ. The equilibrium above is established by placing solid NH4HS in an evacuated container at 25 °C. At equilibrium, some solid NH4HS remains in the container. Predict and explain each of the following.a.The effect on the equilibrium partial pressure of NH3 gas when additional solid NH4HS is introduced into the container.b.The effect on the equilibrium partial pressure of NH3 gas when additional H2S gas is introduced into the container.c. The effect on the mass of solid NH4HS present when the volume of the container is decreased.d. The effect on the mass of solid NH4HS present when the temperature is increased
The answers for following multiple question are given below.
(a)The equilibrium pressure of NH3 gas would remain unaffected. KP = (PNH3)(PH2S). Thus the amount of solid NH4HS present usually does not affect the equilibrium of the reaction.
(b) Generally, the equilibrium pressure of NH3 gas would decrease. In order for the pressure equilibrium to be constant, KP, to remain constant, the equilibrium pressure of NH3 must decrease when the pressure of H2S is increased. KP = (PNH3)(PH2S). (The complete explanation is based on the LeChatelier’s principle is also acceptable.)
(c) The mass of NH4HS increases because a decrease in volume causes the pressure of each gas to increase. To maintain the value of the pressure equilibrium constant, Kp, the pressure of each of the gases must decrease. The decrease in pressure is realized by the formation of more solid NH4HS. Kp = (PNH3)(PH2S). (A complete explanation based on LeChatelier’s principle is also acceptable.)
(d) Basically, the mass of NH4HS decreases because the endothermic reaction absorbs heat and goes nearer to completion (to the right) as the temperature increases.
Generally, for any chemical reaction, the equilibrium constant can be defined as the ratio between the amount of reactant and the amount of product which is used to determine chemical behaviour. At equilibrium, for any reaction, Rate of the forward reaction = Rate of the backward reaction.
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Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 25.0 L.
I understood how to do this first paer of the question...
I did 1atm * 24L = 24.0J
Then did -24*101.325= -2431.8
It is the second part of the question I do not understand....
Now calculate the work done if this process is carried out in two steps. 1. First, let the gas expand against a constant external pressure of 5.00 atm to a volume of 5.00 L. 2. From there, let the gas expand to 25.0 L against a constant external pressure of 1.00 atm.
The answer is -4040 but how do you get that answer?
The work done by the gas during an expansion is, -0.0242 MJ.
The work done by the gas during an expansion is given by the equation:
w = -P_extΔV
where P_ext is the external pressure,
ΔV is the change in volume of the gas.
The gas is expanding from an initial volume of 1.00 L to a final volume of 25.0 L, so:
ΔV = V_final - V_initial = 24.0 L
The external pressure is given as 1.00 atm = 1.01 × 10^-3 MPa
The work done by the gas is:
w = -P_extΔV = -(1.01 × 10^-3 MPa)(24.0 L) = -0.0242 MJ
Note that the negative sign indicates that the work is done by the gas on the surroundings.
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What is the mass of a piece
of iron that has a volume
of 1.00 cm3 ? The density of
iron is 7.90 g/cm3
7.90g is the mass of a piece of iron that has a volume of 1.00 cm³.
It is the most abundant element on Earth by mass.
What is iron?Iron has the chemical symbol Fe (from Latin: ferrum) as well as the atomic number 26. It is a metal from the periodic table's first transition series within group 8.
It is the most abundant element on Earth by mass, currently ahead behind oxygen (32.1% and 30.1%, respectively), and makes up much of the Earth's outer and inner cores.
density = mass /volume
7.90 g/cm³ = mass/ 1.00 cm³
mass = 7.90 ×1.00 g=7.90g
Therefore, 7.90g is the mass of a piece of iron that has a volume of 1.00 cm³.
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You received no credit for this question in the 16 1 attempt let Check my work 0.75 points Select the single best answer. Which one of the following isomers of bromodimethylbenzene cannot undergo nucleophilic aromatic substitution by treatment with sodium amide in liquid ammonia? CH CH, CH, o сн. H.C pr Br CH References B Br CH CH S Prov o EI Type here to search
The correct answer is B.Bromodimethylbenzene B cannot undergo nucleophilic aromatic substitution
By treatment with sodium amide in liquid ammonia because the two bromine atoms attached to the benzene ring are meta-directing, which would prevent the reaction from occurring.Bromodimethylbenzene is an organic compound made up of a benzene ring with two bromine atoms and two methyl groups attached. It is a colorless liquid at room temperature and has a slightly sweet odor. It is used as an intermediate in the production of a variety of organic compounds, such as dyes and pharmaceuticals. It can also be used as a solvent for various compounds. Bromodimethylbenzene is a toxic substance and should be handled with caution.
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if you decrease temperature of an endothermic reaction, will the reaction favor products or reactants_________
if you decrease temperature of an endothermic reaction, will the reaction favor products or reactants will shift it in the direction that is exothermic.
About exothermicExothermic reactions are chemical reactions that occur in everyday life. Exothermic reactions have certain characteristics that distinguish them from endothermic reactions.
The characteristics of an exothermic reaction are:
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which of the following molecules is not directly formed by any of the steps of the citric acid cycle? a. ATP.
b. CO2. c. NADH. d. FADH2
e. coenzyme
ATP is not directly formed by any of the steps of the citric acid cycle. Option A is correct.
Although, the citric acid cycle produces some ATP indirectly through the electron transport chain, the production of ATP from the citric acid cycle does not occur directly in any of the steps of the cycle. The other options (CO₂, NADH, FADH₂, and coenzyme) are all directly involved in various steps of the citric acid cycle.
Citric acid cycle: The citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the mitochondria of eukaryotic cells and the cytoplasm of prokaryotic cells. It is a central metabolic pathway that completes the oxidation of carbohydrates, fats, and proteins, releasing energy that is used to produce ATP, the primary energy currency of the cell.
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If a glass of water contains (6.00x10^24) hydrogen atoms, how many moles of H2O are present? The Avogadro constant is 6.02 x 1023 mol-1.
If a glass of water contains( 6.022×10²⁴) hydrogen atoms, how many moles of H[tex]_2[/tex]O are present, 10 moles are there.
What is water?Water has the chemical formula H[tex]_2[/tex]O and is an inorganic substance. It is a clear, tasteless, odorless, and almost colorless chemical substance that is the primary ingredient of the Earth's hydrosphere as well as the fluids of all recognized living species.
Despite not supplying food, energy, or organic micronutrients, it is essential for all known life forms. Its chemical equation, H[tex]_2[/tex]O, reveals that every single its molecules is made up of one hydrogen atom and two oxygen atoms that are linked together by covalent bonds.
mole = given number of atom/ Avogadro number
= 6.022×10²⁴ / 6.022×10²³
= 10 moles
Therefore, 10 moles are there.
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which of the following statements is true? a weak acid solution consists of mostly non-ionized acid molecules
The statements that true is A weak acid solution consists of mostly insoluble acid molecules.
The definition of a weak acid is something that partially dissociates into a solvent. This also implies that the majority of the molecules in a mild acid solution continue to be insoluble in their natural state.
A strong electrolyte is a solution in which all solute particles entirely separate into ions in a solvent.
A weak electrolyte, on the other hand, is a solution in which solute particles only partially split apart into ions.
As like dissolves like, a molecular compound is a covalent compound. In polar solvents like water, molecular molecules cannot dissolve.
Your question is incomplete but most probably your full question was Choose the statement below that is TRUE.
a. A weak acid solution consists of mostly non-ionized acid molecules.
b. The term "strong electrolyte" means that the substance is extremely reactive.
c. A strong acid solution consists of only partially ionized acid molecules.
d. The term "weak electrolyte" means that the substance is inert.
e. A molecular compound that does not ionize in solution is considered a strong electrolyte.
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50 points!
Using at least 5 sentences, explain how introducing a new organism into an ecosystem can affect the stability of that system. Give specific examples.
Answer:
A new organism in an ecosystem can either greatly downgrade the quality of the ecosystem, upgrade, or bring no significant changes. Although it does usually benefit the ecosystem, it's safe to say some organisms may bring a decline to vital animals already present in the ecosystem. For example, if a new and quite aggressive species are introduced to the ecosystem, it may not have natural predators that would control its amount. That would cause an overabundance of that species and a decline in other organisms that they feed on. It can overbreed and spread throughout the ecosystem eating all the species that can't compete with them (due to the fact that the ecosystem does not have a defense against them).
It's 8 points and you didn't even say thanks to the person who answered for you. smh
Which of the following elements would be a good selection as the sacrificial electrode in the cathodic protection of tin (Sn)?
I. Silver
II. Copper
III. Nickel
IV. Magnesium
The elements that would be the good selection as the sacrificial electrode in the cathodic protection of tin, Sn is the correct option is III. Nickel and IV. Magnesium.
The Sacrificial anodes are helpful to protect the metal structures from the corroding. The Sacrificial anodes will work by the oxidizing to quickly as compared to the the metal that is protecting, and that is being consumed completely and before the other metal will reacts with the electrolytes. The Sacrificial anodes is the metals or the alloys that is attached to the hull that is more anodic.
Thus, the nickel and magnesium is used as the sacrificial electrode in the cathode protection of the tin.
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Which of the following sets of quantum numbers are not allowed? For each incorrect set, state why it is incorrect. a. n = 3, € = 3, me = 0, m, = -1 b. n = 4, l = 3, me = 2, m, = -2 c. n = 4, l = 1, me = 1, m, = + d. n = 2, { = 1, me = -1, m, = -1 e. n = 5, 6 = -4, me = 2, m, = +1 f. n = 3, l = 1, me = 2, m, = -2 -ia +
The quantum numbers show the position of the electrons.
What are the allowed quantum numbers?The question has unclear options hence I would discuss the quantum numbers generally.
In quantum mechanics, the allowed quantum numbers depend on the physical system under consideration. However, in the case of an electron in an atom, the allowed quantum numbers are:
Principal quantum number (n): determines the overall energy and distance from the nucleus, where n = 1, 2, 3, and so on.
Azimuthal quantum number (l): determines the angular momentum and the shape of the orbital, where l can range from 0 to (n-1).
Magnetic quantum number (m): determines the orientation of the orbital in space, where m can range from -l to l.
Spin quantum number (s): determines the intrinsic angular momentum of the electron, where s = ±1/2.
The combination of these quantum numbers completely specifies an electron's state in an atom.
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An experiment is conducted in order to determine the mass of silver metal in an alloy. The alloy is dissolved in acid to convert all the silver metal to silver ions, and those ions are then precipitated by reaction with excess sodium chloride. The precipitate is washed, dried and weighed, and the following data are collected. Mass of silver alloy = 4.3148 g Mass of filter paper = 0.50000 g Mass of filter paper and dried precipitate 1.9332 g What is the percent by mass of silver in the alloy? a. 0.010000 % b. 1.0787 % c. 25.000 % d. 100.00 %
When the precipitate is washed, dried and weighed, then the percent by mass of silver in the alloy is 100%.
First, we need to determine the mass of the silver in the precipitate. We can do this by subtracting the mass of the filter paper from the mass of the filter paper and dried precipitate:
mass of precipitate = (mass of filter paper and dried precipitate) - (mass of filter paper)
mass of precipitate = 1.9332 g - 0.50000 g = 1.4332 g
Since all the silver in the alloy was converted to silver ions and then precipitated as silver chloride, the mass of silver in the precipitate is equal to the mass of silver in the original alloy. Therefore, the percent by mass of silver in the alloy is:
percent by mass of silver = (mass of silver / mass of alloy) x 100%
We just need to solve for the mass of silver. We know that the mass of the alloy was 4.3148 g, so the mass of silver must be:
mass of silver = mass of alloy - mass of other elements
Since we're assuming the alloy is pure silver and other elements, we can simply subtract the mass of the other elements from the mass of the alloy to get the mass of silver. We don't have information about the mass of other elements, but we can assume it's small enough to be negligible.
So, we have:
mass of silver = 4.3148 g - 0 g (assumed negligible) = 4.3148 g
Now we can calculate the percent by mass of silver:
percent by mass of silver = (mass of silver / mass of alloy) x 100%
percent by mass of silver = (4.3148 g / 4.3148 g) x 100%
percent by mass of silver = 100.00%
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CaCO, (s) ở CaO (8) + CO, (g) AH' - 178 kJ/mol. The reaction system represented above is at equilibrium. Which of the following will decrease the amount of CaO(8) in the system? a. Increasing the volume of the reaction vessel c. Removing some CO (9) b. Lowering the temperature of the system d. Removing some Caco, (8)
The answer is c. Removing some CO (g). Removing some CO (g) will decrease the amount of CaO(8) in the system
The equilibrium expression for the reaction given is:
CaCO3(s) ↔ CaO(s) + CO2(g)
Removing some of the CO2(g) from the system will shift the equilibrium to the left, reducing the amount of CaO(s) in the system. This is because the reaction is exothermic and shifts to the side with the lower energy.
Mathematically, the reaction can be represented as:
CaCO3(s) + heat ↔ CaO(s) + CO2(g)
If we remove some of the CO2(g), the equation becomes:
CaCO3(s) + heat ↔ CaO(s)
This shift to the left reduces the amount of CaO(s) in the system.
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complete question:CaCO, (s) ở CaO (s) + CO, (g) AH' - 178 kJ/mol. The reaction system represented above is at equilibrium. Which of the following will decrease the amount of CaO(s) in the system?
a. Increasing the volume of the reaction vessel
b. Lowering the temperature of the system
c. Removing some CO (g)
d. Removing some Caco, (s)
for part 3: in your lab notebook, write a net ionic equation for the two changes observed: (1) the solid forming and (2) the solid dissolving. these changes are explained within the lab manual. if you did not see these changes, make a note to repeat this part on day 2.
The ionic equation for solid forming is Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s) and the ionic equation for the solid dissolving is Cu(OH)2(s) + 2OH-(aq) → Cu(OH)4 2-(aq).
Solid forming refers to the process of creating a solid object or structure from a material that is initially in a liquid, powder, or semi-solid state. This process can be achieved through a variety of methods, including casting, molding, extrusion, and additive manufacturing (3D printing).
Casting involves pouring molten metal or other material into a mold to create a specific shape as the material cools and solidifies. Molding is similar to casting, but typically involves using a preformed mold made of material such as plastic, silicone, or metal. Extrusion involves pushing a material through a die to create a continuous shape, such as a tube or rod.
• ionic equation for Solid forming:
Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s)
Solid dissolving is a process by which a solid substance dissolves in a liquid to form a homogenous solution. In this process, the solid substance (solute) is broken down into individual molecules or ions, which are then surrounded by the molecules of the liquid (solvent).
The rate at which a solid dissolves in a liquid depends on a number of factors, including the surface area of the solid, the temperature of the liquid, and the concentration of the solute in the liquid. Generally, increasing the surface area of the solid, increasing the temperature of the liquid, and increasing the concentration of the solute in the liquid all increase the rate of dissolution.
The process of solid dissolving can be understood using the concept of intermolecular forces. The attractive forces between the molecules of the solute and solvent play an important role in the dissolution process. When the forces of attraction between the solute and solvent molecules are stronger than the forces holding the solute together, the solute dissolves in the solvent.
• Solid dissolving:
Cu(OH)2(s) + 2OH-(aq) → Cu(OH)4 2-(aq)
If you did not observe these changes, it is recommended to repeat the experiment on day 2.
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When a mixture of 56.0 g acetylene, c2h2 , and 81.0 g oxygen, o2 , is ignited, the resultant combustion reaction produces co2 and h2o . (a) Write the balanced chemical equation for this reaction. (b) Which is the limiting reactant? (c) How many grams of C2H2, O2, CO2, and H2O are present after the reaction is complete?
When a mixture of 56.0 g acetylene,C₂H₂ , and 81.0 g oxygen, O₂ , is ignited, the resultant combustion reaction produces CO₂ and H₂O. There are 27.144 g C₂H₂, 91.872 g CO₂, and 18.792 g H₂O present after the reaction is complete with the oxygen as limiting reactant.
First we should write the balance chemical equation
2C₂H₂ + 5O₂ =4CO₂ + 2H₂O
Then we can calculate the moles of the reactant
Moles acetylene = mass / mass molar
Moles acetylene = 56 g / 26 g/ moles
Moles acetylene = 2.15 moles
Moles oxygen = mass / mass molar
Moles oxygen = 81 g / 31 g/ moles
Moles oxygen = 2.61 moles
From the reaction we know that 2 moles of acetylene reacted with 5 moles of oxygen produce 4 mole of carbon dioxide an 2 moles water. in this reaction oxygen fully reacted an acetylene excess so the limiting reactant is oxygen.
Because of oxygen is fully reacted the moles acetylene that present after reaction complete will be
Moles acetylene = 2/5 x mole oxygen
Moles acetylene = 2/5 x 2.61 moles
Moles acetylene = 1.044 moles
mass acetylene = moles x mass molar
Mass acetylene = 1.044 moles x 26 g/ moles
Mass acetylene = 27.144 g
Moles CO₂= 4/5 x mole oxygen
Moles CO₂= 4/5 x 2.61
Moles CO₂= 2.088 moles
Mass CO₂ = moles x mass molar
Mass CO₂ = 2.088 moles x 44 g/ moles
Mass CO₂ = 91.872 g
Moles H₂O = 2/5 x mole oxygen
Moles H₂O = 2/5 x 2.61 moles
Moles H₂O = 1.044 moles
Mass H₂O = moles x mass molar
Mass H₂O = 1.044 moles x 18 g/ moles
Mass H₂O = 18.792 g
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How many grams is 5.89 moles of cobalt
347.12 gram present in 5.89 moles of cobalt.1 mole is equal to 6.023 × 10²³ particles.
What do you mean by the term mole ?The term mole is defined as the amount of material containing 6.023 × 10²³ particles.
1 mole is equal to 6.023 × 10²³ particles.
It can be utilized to measure out the products obtained from the chemical reaction. The unit is referred by mol. The formula for the number of moles formula is showed as follows.
Number of Moles = Mass of substance ÷ Mass of one mole.
The amount of atoms, molecules, or other particles 6.023 × 10²³ that make up one mole of a material is known as Avogadro's Number. One mole of hydrogen, for instance, is represented by hydrogen atoms. One mole of water is equal to 6.023 × 10²³ water molecules.
1 mole of cobalt = 58.9345 grams
Therefore, 5.89 moles of cobalt = 5.89 × 58.9345
= 347.12 gram
Thus, 5.89 moles of cobalt contains 347.12 gram.
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polymers may be composed of thousands of monomers. draw three repeat units of acrylonitrile. assume there are hydrogen atoms on the two ends of the trimer. ignore stereochemistry
H
|
H2C = CH - C ≡ N
|
H
This is a repeat unit of acrylonitrile. Three such units together, with hydrogen atoms on each end, would be drawn as:
H H
| |
H2C = CH - C≡N-CH2-CH=C H - C≡N
| |
H H
What is acrylonitrile?
Acrylonitrile is a colorless, liquid organic compound with the chemical formula C3H3N. It is an important monomer used in the production of various synthetic polymers, such as polyacrylonitrile, which is used in the manufacture of carbon fibers, and acrylonitrile-butadiene-styrene (ABS), a thermoplastic used in various applications such as automotive parts, toys, and electronic housings. Acrylonitrile is also used as a fumigant, in the production of specialty chemicals, and as a precursor to various pharmaceuticals. It is a highly reactive compound and must be handled with care due to its toxicity and flammability.
Hence, the answer is,
H H
| |
H2C = CH - C≡N-CH2-CH=C H - C≡N
| |
H H
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2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O In the above equation how many grams of N2 can be made when 132 grams of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
[tex]7.7 g[/tex] of N2 can be made when 132 grams of CuO are consumed.
The equation can be written as: NH3 + 3CuO → 3Cu + N2 + 3H2O
To calculate the amount of N2 produced in grams when 132 grams of CuO is consumed, we need to use the molar mass of each element.
Molar Mass of N2 = [tex]14 g/mol[/tex]
Molar Mass of CuO = [tex](63.5 + 16) g/mol = 79.5 g/mol[/tex]
Therefore, the number of moles of CuO consumed is [tex]\frac{ 132}{79.5} = 1.65 mol[/tex]
The ratio of N2 to CuO in the equation is 1 : 3. Therefore, the number of moles of N2 produced is[tex]\frac{1.65}{3 }= 0.55 mol.[/tex].
Now, to calculate the mass of N2 produced, we need to multiply the number of moles of N2 produced by the molar mass of N2, i.e. [tex]0.55 * 14 = 7.7 g.[/tex]
Therefore, the answer is [tex]7.7 g[/tex] of N2 can be made when 132 grams of CuO are consumed.
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complete question:2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
In the above equation, how many grams of N2 can be made when 15 moles of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16
Calculate the concentrations of each ion remaining in solution after the precipitation is complete.
The precipitation reaction involves 75.0 mL of .0750 M solution of potassium phosphate and 75.0 mL of .0750 M iron (II) acetate.
The concentrations of each ion remaining in solution after the precipitation is complete are [Fe2+] = 0.0375 M, [PO43-] = 0.01875 M, [K+] = 0.1125 M, and [CH3COO-] = 0.0375 M.
What is Precipitation ?
Precipitation can occur in a variety of chemical reactions, but it is most commonly associated with double displacement reactions, where two ionic compounds are mixed together and the cations and anions switch partners. If one of the resulting products is insoluble, it will form a solid that will settle to the bottom of the container.
To solve this problem, we need to determine the products of the reaction between potassium phosphate (K3PO4) and iron (II) acetate (Fe(CH3COO)2), which will result in the precipitation of an insoluble salt.
The balanced chemical equation for the reaction is:
2Fe(CH3COO)2 + 3K3PO4 → Fe3(PO4)2 + 6CH3COOK
From the equation, we can see that the products of the reaction are iron(III) phosphate (Fe3(PO4)2) and potassium acetate (CH3COOK).
To determine the concentrations of the ions remaining in solution, we can use the following steps:
Calculate the number of moles of potassium phosphate and iron (II) acetate in the solutions:
moles of K3PO4 = 0.0750 M x 0.0750 L = 0.005625 mol
moles of Fe(CH3COO)2 = 0.0750 M x 0.0750 L = 0.005625 mol
Determine the limiting reactant. Since the stoichiometric ratio of K3PO4 to Fe(CH3COO)2 is 3:2, we can see that the limiting reactant is Fe(CH3COO)2, since we have an equal number of moles of both reactants.
Use the stoichiometry of the balanced chemical equation to calculate the number of moles of the products:
moles of Fe3(PO4)2 = (0.005625 mol Fe(CH3COO)2) x (1 mol Fe3(PO4)2 / 2 mol Fe(CH3COO)2) = 0.002813 mol
moles of CH3COOK = (0.005625 mol Fe(CH3COO)2) x (6 mol CH3COOK / 2 mol Fe(CH3COO)2) = 0.016875 mol
Calculate the concentrations of the remaining ions by subtracting the number of moles of the reactants from the number of moles of the initial solution and dividing by the total volume:
[Fe2+] = (0.005625 mol - 0 mol) / 0.150 L = 0.0375 M
[PO43-] = (0.005625 mol - 0.002813 mol) / 0.150 L = 0.01875 M
[K+] = (0.016875 mol - 0 mol) / 0.150 L = 0.1125 M
[CH3COO-] = (0.005625 mol - 0 mol) / 0.150 L = 0.0375 M
Therefore, the concentrations of each ion remaining in solution after the precipitation is complete are [Fe2+] = 0.0375 M, [PO43-] = 0.01875 M, [K+] = 0.1125 M, and [CH3COO-] = 0.0375 M.
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In a combination reaction, 2.07 g of magnesium is heated with 9.05 g of nitrogen. How many moles of product are formed? Assume the reaction goes to completion.
Answer:
Many moles are formed
Explanation:
A 524.7 ng sample of an unknown radioactive substance was placed in storage and its mass was measured periodically. After 47 days the amount of radioactive substance had decreased to 65.59ng. How many half‑lives of the unknown radioactive substance have occurred?
Number of half-lives is 3
The decay of this radioactive unknown compound is a first-order process.
We can express the time dependence of its mass m using a first-order integrated rate law, where k is the rate constant:
mt = mass at time t
m0 = initial mass
t = time
Procedure:
1) We need to find "k":
From the first-order rate law we clear k,
[tex]\frac{mt}{mo} = e^{-kxt}[/tex]
㏑[tex](\frac{mt}{mo})= -kxt[/tex]
[tex]\frac{ln(\frac{mt}{mo}) }{-t} = k[/tex]
[tex]k=\frac{ln(\frac{65.59ng}{ 524.7 ng} )}{-47 }[/tex]
k = 0.044[tex]days^{-1}[/tex]
2) We find the half-life from the value of k we have just calculated:
[tex]t\frac{1}{2}[/tex] =[tex]\frac{ln2}{k}[/tex] = 15.7days
3) The number of half-lives of the unknown sample is:
Number of Half-lives = 47 days / 15.7 days = 3 (approx.)
Hence 3 is a correct answer.
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Draw an alternative Lewis (resonance) structure for the incomplete structure. Show the unshared electron pairs and nonzero formal charges in your structure. Don't use radicals. Select Draw Rings More Erase С H N H Н. Н. CEN H H a Determine the formal charge on the nitrogen atom in the structure. If the atom is formally neutral, indicate a charge of zero. Screenshot
To draw an alternative Lewis structure, we need to move electrons to form a double or triple bond between the nitrogen atom and another atom in the molecule. We can also move electrons to form a lone pair on another atom in the molecule. The goal is to achieve a more stable structure with formal charges as close to zero as possible.
For example, consider the incomplete Lewis structure:
H
|
N
One possible resonance structure is:
H
|
N=H
In this structure, we have formed a double bond between the nitrogen atom and one of the hydrogen atoms. We have also placed a lone pair of electrons on the other hydrogen atom.
The formal charge on the nitrogen atom in this structure is:
Valence electrons in nitrogen = 5
Non-bonding electrons = 2
Number of bonds = 1
Formal charge = Valence electrons - Non-bonding electrons - 1/2(Number of bonds) = 5 - 2 - 1/2(1) = 2
Therefore, the formal charge on the nitrogen atom in this structure is +2.
Note that this is just one possible resonance structure. There may be other valid resonance structures that can be drawn, and the actual distribution of electrons in the molecule is a combination of all possible resonance structures.
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you have used a bacterium to propagate a gene that produces a special plant protein that may hold a cure for stomach cancer. identify the function of these items you used in lesson 4
The function of these materials you utilized in the lesson is bacteria, gene, recombinant DNA technology, plasmid vector, and protein expression system. We have employed a bacterium to propagate a gene that makes a specific plant protein that may hold a cure for stomach cancer.
What Is Protein?Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bone, skin, or hair. It aids in the production of hemoglobin, which transports oxygen in the blood, and enzymes, which fuel a variety of chemical reactions. The majority of the body's organs, tissues, and body parts, including muscle, bone, skin, and hair, are made of protein. It aids in the production of hemoglobin, which transports oxygen in the blood, and enzymes, which fuel a variety of chemical reactions. At least 10,000 different proteins make up you, and they also keep reader that way.
What is the role of protein?Every cell in the human body has protein. To repair damaged cells and create new ones, your body needs protein in your diet. For toddlers, teenagers, and expectant women to develop properly and expand to their full potential, protein is crucial. It accelerates metabolic reactions, synchronizes biological processes, and promotes tissue growth and repair. Proteins give your body its structural support and ensure optimal pH and fluid equilibration.
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which of the following compound that uncouples electron transport from atp synthesis and allow h back across without atp synthase? 2,4-dinitrophenol (dnp) rotenone oligomycin antimycin a cyanide
A: 2,4-dinitrophenol (DNP) is the compound that uncouples electron transport from ATP synthesis and allows H+ back across without ATP synthase.
DNP is a protonophore that acts by making the inner mitochondrial membrane leaky to protons. This causes a disruption of the proton gradient that drives ATP synthesis by the ATP synthase, which in turn uncouples the electron transport chain from ATP synthesis. This can result in a decrease in the efficiency of cellular respiration, and in some cases, can be toxic to cells. In contrast, the other compounds listed (rotenone, oligomycin, antimycin A, and cyanide) act by inhibiting various components of the electron transport chain and do not directly uncouple electron transport from ATP synthesis.
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Succinic anhydride, the structure of which is shown, is a cyclic anhydride often used in Friedel-Crafts acylations. Draw the structure of the product obtained when benzene is acylated with succinic anhydride in the presence of aluminum chloride.
The reaction of benzene with succinic anhydride in the presence of aluminum chloride as a catalyst is a Friedel-Crafts acylation reaction. The product obtained from this reaction is benzene-1,4-dicarboxylic acid.
A carbonyl group is a functional group that consists of a carbon atom double-bonded to an oxygen atom (C=O). It is a polar group and is found in a variety of organic compounds, such as aldehydes, ketones, carboxylic acids, esters, amides, and others.
carbonylgroup from succinic anhydride adds to one of the ortho- or para- positions of benzene, but the resulting intermediate is unstable and rearranges to the more stable meta- isomer. The final product is the result of two such additions to opposite carbons of the succinic anhydride.
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the ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. the distance that the beam sinks into the ground depends on the
The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. the distance that the beam sinks into the ground depends on the:
initial height of the ram. initial potential energy of the ram. kinetic energy of the ram when it first hits the beam.Potential energyPotential energy is the energy possessed by an object because of its position with respect to a reference. An example of potential energy is a stone placed on the edge of a table has a different potential energy from a stone placed on the floor.
For example, an unused bow will have zero potential energy. However, when pulled, this bow will have potential energy because of the tendency of the arrow to return to its original position.
Kinetic energyKinetic energy is the energy an object has because of its motion. The higher the speed of a moving object, the greater the energy it has.
For example, suppose a stone is dropped from a table into a glass below. When the glass is still on the table, the potential energy is great.
Then, just before the rock hits the glass, its potential energy approaches zero. However, the further down the motion energy is also greater. This motion energy causes the glass to break.
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If the partial pressure of Aris 749 torr, calculate the total pressure (torr) of the mixture visualized. o o o o o o O o O o o O O 20 ON 11,235 torr 749 torr 803 torr 699 torr
To calculate the total pressure of the mixture, we need to add up the partial pressures of all the gases in the mixture. The partial pressures given are:
Ar: 749 torr
O2: 11,235 torr
N2: 803 torr
Other gases (assumed to be negligible): 699 torr
Therefore, the total pressure of the mixture is:
749 torr + 11,235 torr + 803 torr + 699 torr = 13,486 torr
Therefore, the total pressure of the mixture is 13,486 torr.
The overall pressure ptot is the total of all pressures in a reference system. This pressure, according to Bernoulli (see Fluid mechanics), consists of the static pressure p, the dynamic pressure pdyn, and the geodetic component ( g z) that exists in a fluid along a stream line in a frictionless flow.
The total pressure of a gas mixture is the sum of its component gases' partial pressures: Ptot = ∑Pi = P1 + P2 + P3... ntot = total number of moles in the gas mixture (the sum of all ni).
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based on what you know of glycosidic bond-forming reactions in nature, propose a reasonable mechanism for the linking of the two monosaccharides, starting with the activated hemiacetal species, assuming that it is a udp species as in the cellulose glycosidic bond-forming reaction
In nature, the linking of two monosaccharides through a glycosidic bond involves the formation of an intermediate hemiacetal species. The activated hemiacetal species in this case is UDP, and it is used to form the glycosidic bond in cellulose.
The first step in the reaction is the activation of the UDP molecule by phosphorylation, which leads to the formation of UDP-glucose. The UDP-glucose then reacts with the hydroxyl group on the C4 carbon of another glucose molecule to form a glycosidic bond. This reaction is catalyzed by the enzyme cellulose synthase, which binds the glucose molecules and orients them in a way that facilitates the formation of the glycosidic bond. The result is the formation of a long chain of glucose molecules joined by glycosidic bonds, which constitutes the cellulose polymer.
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When 12 oz. cans of regular Coke and Diet Coke are placed in a large container of water, some float while others sink.
Diet Coke will
[ Select ]
in a large container of water because
[ Select ]
and therefore has
[ Select ]
.
Diet Coke will float in a large container of water because it has less mass and therefore has less density than regular Coke.
What is the relationship between density and floating?The relationship between density and floating is that an object will float in a fluid if it is less dense than the fluid. This is because buoyant force, which is the upward force exerted by a fluid on an object immersed in it, is greater than the weight of the object.
On the other hand, an object will sink in a fluid if it is more dense than the fluid, because the weight of the object is greater than the buoyant force acting on it.
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