Answer:
electrons have a negative charge
Explanation:
Answer:
Electrons
Explanation:
Describe the energy of the products in comparison to the energy the atoms had when the were wandering around the room free.
Answer: The atoms of the solid products are tightly packed whereas those in gas are loose.
Explanation:
Atoms in the solid structure are linked to each other by strong force of attraction and they collectively form an three-dimensional structure. The binding of the atoms form the shape of the solid product. The gas exhibit free atoms in it. The atoms are not linked to one another by strong force of attraction. The atoms as a part of gas have higher energy as those present in the solid products. So, the atoms of the gas wander freely as compared to those in the solid products.
A first-order reaction is 81omplete in 264s. A. What is the half-life for this reaction? b. How long will it take for the reaction to reach 95ompletion?
A first-order reaction is 81omplete in 264s.The half-life for this reaction (i) t 1/2 = =3.465×10 −3 s.to reach 95% Completion = 285 s.
To measure reaction rates, chemists initiate the reaction, measure the concentration of the reactant or product at different times as the reaction progresses,
For a 0-order response, the mathematical expression that may be employed to determine the half of life is: t1/2 = [R]0/2k. For a first-order reaction, the half of-existence is given by: t1/2 = zero.693/ok. For a 2d-order response, the method for the half-life of the response is: 1/okay[R]0
The 1/2-life of a response (t1/2), is the quantity of time needed for a reactant concentration to lower via half of compared to its initial awareness. Its software is used in chemistry and medicine to are expecting the awareness of a substance over time
Half of the lifestyles is the time required for exactly 1/2 of the entities to decay 50%.
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Which halogen or halogen-containing compound is typically used as a form of topical antisepsis?
The halogen or halogen-containing compound is typically used as a form of topical antisepsis will be "iodophor".
Iodine will be employed as an antiseptic in the manner of a tincture of iodine, essentially an alcoholic solution.
Iodophor would be an iodine-containing solution that also contains a solubilizing agent, like povidone or a surfactant. Iodophor would be a common sanitizer in the dairy but also brewing sectors. Generally, a high molecular weight carrier, commonly a polymer, has been polymerized with iodine.
Therefore, the halogen or halogen-containing compound is typically used as a form of topical antisepsis will be "iodophor".
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Which of the following is NOT a property of metals?
A - shiny
B - ductile
C - can be solids, liquids, or gases
D - malleable
Answer:
C - can be solids, liquids, or gases
Explanation:
an example of xenon (Xe)
Answer: i am not sure what you mean but here are some product of xenon stroboscopic lamps, photographic flash lamps, high-intensive arc-lamps for motion picture projection, some lamps used for deep-sea observation, bactericidal lamps, sunbed lamps and high-pressure arc all use this gas. In fact, you probably see xenon lamps on a regular basis and if you want compounds : Xe2F2, XeF4, XeO3, XeF6....
Explanation:
1.0 mol of ethanol and 1.0 mol of acetic acid are dissolved in water and kept at 100 °C. The volume of the solution is 250 mL. At equilibrium, 0.25 mol of acetic acid has been consumed in producing ethyl acetate. Calculate Kc at 100 °C for the reaction C2H5OH(aq) + CH3CO2H(aq) CH3CO2C2H5(aq) + H2O(l)
Answer:
Kc = 0.333
Explanation:
First of all we state the equilibrium reaction:
C₂H₅OH(aq) + CH₃CO₂H(aq) ⇄ CH₃CO₂C₂H₅(aq) + H₂O(l)
Initially we start with 1 mol of alcohol and 1 mol of acid. After the reaction goes complete, 0.25 moles of acid have been consumed. As ratio is 1:1, we also consumed 0.25 moles of alcohol. Then, in the product side we finally produced 0.25 moles of water and 0.25 moles of ethyl acetate.
How many moles are available in the reactant side, after the equilibrium?
1 mol - 0.25 moles (that have been reacted) = 0.75 moles.
To determine Kc, we need molar concentrations, so let's see M in products and reactants:
0.75 mol / 0.25 L = 3 M
0.25 mol / 0.25 L = 1 M
We needed to convert 0.250 mL to L → 0.250 mL . 1L/ 1000mL = 0.250 L
Let's determine expression for Kc:
Kc = [H₂O] . [CH₃CO₂C₂H₅] / [C₂H₅OH] . [CH₃CO₂H]
1 . 1 / 3 . 3 = 1/9 → 0.333
Which of the following is an oxidation-reduction reaction?
SO2(g) + H2O(l) Right arrow. H2SO3(aq)
CaCO3(s) Right arrow. CaO(s) + CO2(g)
Ca(OH)2(s) + H2CO3(l) Right arrow. CaCO3(aq) + 2H2O(l)
C6H12O6(s) + 6O2(g) Right arrow. 6CO2(g) + 6H2O(l)
B. The chemical reaction that represents oxidation - reduction reaction is CaCO3(s) → CaO(s) + CO2(g).
Oxidation reduction reaction
In oxidation reduction reaction, the oxidizing agent is reduced while reducing agent is oxidized.
In the chemical equation below;CaCO3(s) → CaO(s) + CO2(g)
Calcium (ca) is oxidized calcium (II) ion while the carbon (IV) oxide is reduced carbon (IV) oxide.
Thus, the chemical reaction that represents oxidation - reduction reaction is CaCO3(s) → CaO(s) + CO2(g).
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Answer: The answer is B
Explanation: on edge
The enthalpy of fusion for Al is 10.7 kJ/mol. What is the energy change when 30.8 g of Al solidifies at 660°C?
The enthalpy of fusion for Al is 10.7 kJ/mol. -12.2 kJ is the energy change when 30.8 g of Al solidifies at 660°C.
What is Enthalpy of Fusion ?The amount of energy needed to change 1 mole of substance under state change at constant temperature and pressure is called enthalpy of fusion. It is also known as Latent heat of fusion. Unit of enthalpy of fusion is kJ/mol.
How to find the change in energy ?To find the change in energy use this expression:
q = n ΔH
where
q = Energy change
n = number of moles
ΔH = Molar enthalpy
Number of moles (n) = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{30.8\ g}{26.98\ \text{g/mol}}[/tex]
= 1.141 mol
Now put the values in above formula we get
q = - n ΔH [Negative sign is used because Al solidifies here]
= - (1.141 mol × 10.7 kJ/mol)
= -12.2 kJ
Thus from the above conclusion we can say that The enthalpy of fusion for Al is 10.7 kJ/mol. -12.2 kJ is the energy change when 30.8 g of Al solidifies at 660°C.
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Cesium sulfite is formed from the cs cation and the so2−3 anion. What is the correct formula for this compound?
Cesium Sulfite is formed from the Cs cation and the SO₃⁻² anion. The correct formula for this compound is Cs₂SO₃.
What is Cation ?Cations are positively charged ions. It forms when an element lose one or more electrons.
Anions are negatively charged ions. It form when an element gains one or more electrons.
Symbol Cs⁺¹ SO₃⁻²
Valency +1 -2
Formula of the compound is Cs₂SO₃.
Thus from the above conclusion we can say that Cesium Sulfite is formed from the Cs cation and the SO₃⁻² anion. The correct formula for this compound is Cs₂SO₃.
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The reaction between calcium carbonate (CaCO3) and HCl produces calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O).What happens when the concentration of hydrogen chloride (HCl) molecules is doubled in this reaction?
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
When the hydrogen chloride concentration doubles, the number of collisions between the reactants
, which causes the rate of the forward reaction to
.
When the hydrogen chloride concentration doubles, the number of collisions between the reactants becomes increased, which causes the rate of the forward reaction to be faster.
What is the rate of a reaction?The rate of a reaction is how fast a chemical reaction occurs i.e. the conversion of reactants to products.
The rate of a chemical reaction can be influenced by certain factors including the concentration of reactants.
The more the concentration of a reactant, the more the collision between the reactants and hence, the faster the reaction will proceed.
Therefore, when the hydrogen chloride concentration doubles, the number of collisions between the reactants becomes increased, which causes the rate of the forward reaction to be faster
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Answer:1. increases 2. increases
Explanation:
Got it right on plato!
What is the reason why the fermentation products acetate and hydrogen gas (H2) are never abundant in aerobic soils and sediments
Acetate and hydrogen gas (H2) is never abundant in aerobic soils and sediments because they are tiny, highly reduced molecules that many bacteria that breathe oxygen and nitrates quickly absorb to use as fuel for energy generation.
Why are acetate and hydrogen gas not abundant in aerobic soils and sediments?Hydrogen is a substrate for methanogenic archaea and, along with acetate, one of the most significant intermediates in the methanogenic breakdown of organic materials. Numerous methanogenic environments exhibit contributions of H₂ to CH₄ production that are both significantly lower and significantly higher than is considered usual. H₂ is rapidly converted in methanogenic settings due to the simultaneous generation by fermenting and syntrophic bacteria and consumption by methanogenic archaea.
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Meteorologists use weather balloons to carry weather instruments high into the atmosphere. when it is first released at earth’s surface, a weather balloon typically appears underinflated. what happens to the balloon’s volume and pressure as it rises into the atmosphere? check all that apply. the pressure in the balloon decreases. the pressure in the balloon increases. the volume of the balloon increases. the volume of the balloon decreases.
the pressure in the balloon decreases- True
the pressure in the balloon increases- False
the volume of the balloon increases- True
the volume of the balloon decreases- False
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10.0 g of nickel is cooled to 2.0 °C and
placed into a sample of warm water.
The final temperature of the water and
nickel was 63.4 °C. How much energy
is absorbed by the nickel?
J
CNi = 0.120 g. C
9Ni = [?] J
Answer:
73.68 J
Explanation:
To find the energy absorbed by nickel, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> ΔT = change in temperature
The change in temperature is found by subtracting the initial temperature from the final temperature. You can plug the given values into the equation and simplify to find the energy absorbed.
m = 10.0 g
c = 0.120 J/g°C
ΔT = 63.4 °C - 2.0 °C = 61.4 °C
Q = mcΔT
Q = (10.0 g)(0.120 J/g°C)(61.4 °C)
Q = 73.68 J
Classify the following alcohol as primary,
secondary or tertiary.
A. primary
ОН
B. secondary
C. tertiary
Enter
The classification of the alcohols gives;
Compound 1 - Primary alcoholCompound 2 - Tertiary alcoholCompound 3 - Secondary alcoholCompound 4 - Secondary alcoholWhat are alcohols?Organic compounds occurs in families. The family of compounds is called a homologous series. The homologous series always have a functional group. The functional group is the atom, group of atoms or bond that is responsible for the chemical reactivity of the members of a given homologous series.
Now we know that the alcohols are those organic compounds that contains the -OH group. The could be aliphatic or alicyclic compounds. We shall now proceed to name the kind of alcohols that each of the compounds shown are;
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Guys pleaseeeee help:
- Which element is a member of the alkaline earth metals and has 12 neutrons?
- A burnt piece of toast is covered in this element. It is the fourth most abundant element and makes up many living things.
- Which element is an inert gas found in group VIII that produces a red glow in lights?
Answer:
Carbon- A burnt piece of toast is covered in this element. It is the fourth most abundant element and makes up many living things.
Magnesium- Which element is a member of the alkaline earth metals and has 12 neutrons?
Neon- Which element is an inert gas found in group VIII that produces a red glow in lights?
Sulfur has an oxidation number of +6 in which two formulas?
A. SO₂ and SO4²-
B. H₂SO4 and SO₂
C. SO3 and SO4²-
D. HSO4- and S₂03²-
[tex] \sf \blue{B. H_{2}SO4 \: and \: SO_{2}}[/tex]
Explanation:As we know in oxidation, oxygen is added and hydrogen is reduced. And in option B, we can observe that is oxygen added +6. So, we conclude that option B is valid.
Hope it help youWhat is the change in entropy (AS) when a solid substance decomposes and
produces gaseous products?
Entropy directs to the degree of disorderliness in a system. Generally, solids have a greater degree of order when corresponded to gas in which the molecules/particles move randomly in all directions.
The transformation in entropy from solid to gaseous phase is a positive change. Because there is increase disorderliness of the system.
What is entropy definition?
A campfire is an illustration of entropy. The solid wood burns and becomes ash, smoke and gases, all of which applied energy outwards more efficiently than the solid fuel. Ice melting, salt or sugar dissolving, constructing popcorn and boiling water for tea are processed with growing entropy in your kitchen.
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Which of the following statements about the normal operation of nuclear fission reactors is accurate?
Select one:
a. They release large amounts of chemical pollutants into the air.
b. A small amount of fuel produces a large amount of energy.
c. The nuclear waste is quickly and safely disposed of at the reactor site.
d. The hot water surrounding the reactor core can be used to provide hot water for communities in the area.
Answer:
Explanation:
b
The Venn diagram shown below compares the nuclear reactions in the sun and nuclear power plants.
Picture shows two ovals which overlap in the middle. The oval on the left has the label 'Sun' on top and 'A' within it. The oval on the right has the label 'Nuclear power plants' on top and 'Splitting of atoms' within it. The overlapping portion has the label 'Release of energy' within it.
What process is best described by A?
Destruction of atoms
Fission of atoms
Fusion of atoms
Repulsion of atoms
The process which is best described by "A" in this Venn diagram is: C. fusion of atoms.
What is nuclear fusion?Nuclear fusion can be defined as a type of nuclear reaction that involves joining or combining two (2) smaller nuclei of atoms, so as to form a single heavier nucleus accompanied with the release of energy.
Based on the Venn diagram in the image attached below, we can logically deduce that the process which is best described by "A" is fusion of atoms.
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what discovery was found by Nels Bohr model of atom ?
Answer:
What was Niels Bohr's most important discovery? Niels Bohr proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus. This atomic model was the first to use quantum theory, in that the electrons were limited to specific orbits around the nucleus.
Explanation:
Subjects Of Study: atomic model
How many carbon monoxide molecules are in 0.75 moles of carbon monoxide?
Answer:
four 0.5 times 10 to the 23rd Adams of Neptune
Explanation:
Answer:
0.75 ( 6.02 × 10²³) = 4.515 x 10²³
Explanation:
0.75 ( 6.02 × 10²³) = 4.515 x 10²³
A text book is on a desk. If the book weighs 14 N and the area of the book is 0.60 m 2 , what pressure is the book exerting on the desk?
Answer:
Explanation:
Pressure = Force / Area
F = 14 N
Area = 0.60 m^2
Pressure = 14/0.60
Pressure = 23.3 N
If you are worried about significant digits, the answer is 23
a sodium hydroxide solution is 19 M. What will the strength of the solution formed if 25 ml of this NaOH solutio nis diluted to 5.0 Liters
the strength of the solution formed is 3.8.
What is the strength of the solution?The amount of solute dissolved in grammes per litre of the solution is used to determine the solution's strength. It stands for the solution's potency or concentration. It uses grammes per litre of expression.
Concentration of NaOH = 19 M
Initial volume of NaOH = 25 mL= 0.025 L
Moles of NaOH = 19*0.025
= 0.475 moles
Final volume of NaOH solution = 5 L
Final concentration = 0.475/5
= 0.095 M
so, the strength is 19/5
= 3.8
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Carbon dioxide and water are produced when ethanol, C2H5OH, is burned in oxygen. The number of moles of CO2 that is produced when burning 6.0 mol of ethanol is
The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now we have to write the balanced equation
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
We can see that every 1 mole of ethanol we will get 2 mole of CO₂.
So 6.0 mol of ethanol we will get = 6.0 × 2.0
= 12 mol of CO₂
Thus from the above conclusion we can say that The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.
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For what mechanistic reason does g1 of lactase first act as a brønsted acid during catalysis?.
Answer: Carboxylation of hydroquinone
Suppose a aqueous solution of phosphoric acid () is prepared. Calculate the equilibrium molarity of . You'll find information on the properties of phosphoric acid in the ALEKS Data resource.
The equilibrium molarity HPO²₄- = 6.2 x 10⁻⁸M See the explanation below.
What is Equilibrium Molarity?The molar concentration of a certain species in a solution is known as equilibrium molarity.
What is the calculation showing the above answer?
The initial concentration H₃PO₄ = 0.31 M
Kₐ₁ = 6.92 x 10⁻³ (See Image 1 attached)
Kₐ₁ = [H⁺][tex]_{eq}[/tex][H₂PO₄-][tex]_{eq}[/tex] / [H₃PO₄][tex]_{eq}[/tex]
6.92⁻³ x 10 = [(x) * (x)] / (0.31 M - x)
Solving for x, x = 0.043 M
[H+] = x = 0.043 M
[H₂PO₄-] = x = 0.043 M 0.0429805
Kₐ₂ = 6.2 x 10⁻⁸
See the second attached table
Kₐ₂ = [H+][tex]_{eq}[/tex] [HPO₄²-]eq / [H₂PO₄-]eq
6.2 x 10⁻⁸ = [(0.043 M + x) * (x)] / (0.043 M - x)
Solving for x, x = 6.2 x 10⁻⁸ M
[H₂PO₄-]eq = x = 6.2 x 10⁻⁸ M
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Calculate and record the expected mass of benzoic acid required to react with 20.00 mL of a 0.100 M sodium hydroxide solution. Record the mass of benzoic acid using three significant digits to reference later.
The mass of benzoic acid is 0.244 g.
Here use the concept of molarity.
What is molarity?The amount of a substance in a specific volume of solution is known as its molarity (M). The moles of a solute per liter of a solution is known as molarity.
Molarity = no. of moles/volume (in L)
Calculation:Given,
Molarity, M = 0.100 M
Volume, V = 20.00 mL = 20.0 × 10⁻³
To calculate,
Mass of benzoic acid C₇H₆O₂ =?
We know that,
Molecular mass of benzoic acid, C₇H₆O₂ = 122
No. of moles = weight/ molecular mass
The formula is modified as,
Molarity = weight of cholesterol/ (molecular mass) (Volume)
Put the values in the formula,
0.100 = Mass of benzoic acid/ (122) (20 × 10⁻³)
Mass of benzoic acid = 0.100 (122)(20 × 10⁻³)
= 244 × 10⁻³
= 0.244 g
Hence, the mass of benzoic acid is 0.244 g.
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Which statements describe band theory? Check all that apply.
Electrons all have approximately the same energy.
Electrons move among orbitals of different energies.
Electrons move freely among atoms (delocalized).
Answer:
b c
Explanation:
right
Answer:
it was A C for me
Explanation:
chemical change grade 10 mind map
Chemical change: A chemical reaction is the change of one chemical substance into another chemical substance. For instance: The rusting of iron, the curdling of milk, the digestion of food, breathing, etc.
What is a chemical reaction?
A chemical reaction results in a chemical change because a new material has entirely different properties from the original substance. In a chemical reaction, atoms rearrange themselves.Reactants are the chemicals that participate in a chemical reaction.Products are the new compounds created as a result of a chemical process. An illustration of a chemical reaction is burning magnesium in the air to produce magnesium oxide.2Mg(s) + O2(g) △→ 2MgO(s)The magnesium ribbon is cleaned with sandpaper before being burned in the air. This cleans the magnesium ribbon's surface of the basic magnesium carbonate protecting coating.Reactant: Materials that participate in a chemical reaction are referred to as reactants. Mg and O2, as an example.A product is a newly created substance that results from a chemical reaction. Example: MgO.A chemical reaction is the change of one chemical substance into another chemical substance.
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Chemical change is the change chemical substance is transformed into another chemical substance.It is irreversible in nature , for example Reaction of medicine in body , milk to curd etc.
What is the difference between chemical and Physical change?1)Physical change temporary or reversible in nature but chemical change is irreversible in nature
2)In physical change there no new product is formed but in chemical change there formation of new product takes .
3) Physical change is change sin shape ,size or state for example freezing of water , melting of wax , and example of Chemical change are Burning of coal, digestion of food
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Calculate the freezing point depression for 1 kilogram of sodium chloride (NaCl) in 5 kilograms of
water. The Ky of water is -1.86 °C/m.
[tex]\\ \rm\dashrightarrow \Delta T_f=ik_fm[/tex]
m is molalityMoles of NaCl
1000/2343.4molMolality
43.4/58.68[tex]\\ \rm\dashrightarrow \Delta T_f=i(-1.86)(8.68)[/tex]
[tex]\\ \rm\dashrightarrow \Delta T_f=-16.14i[/tex]
i is vant Hoff factor
For NaCl vant Hoff factor is 2( Actually 1.9)
[tex]\\ \rm\dashrightarrow \Delta T_f=-16.14(2)=-32.28°C[/tex]
Moles of NaCl
[tex]\\ \tt{:}\dashrightarrow \dfrac{1000g}{23g/mol}[/tex]
[tex]\\ \tt{:}\dashrightarrow 43.4mol[/tex]
Find Molality
[tex]\boxed{\sf Molality=\dfrac{Moles\:of\:solute}{Volume \:of\: solution\:in\:kg}}[/tex]
Volume of solution=1kg+5kg=6kg[tex]\\ \tt{:}\dashrightarrow m=\dfrac{43.4}{6}=7.2m[/tex]
Vant Hoff factor
[tex]\\ \tt{:}\dashrightarrow NaCl\longrightarrow Na^++Cl^-[/tex]
i=2Freezing point depression
[tex]\\ \tt{:}\dashrightarrow \Delta T_f=iK_fm[/tex]
[tex]\\ \tt{:}\dashrightarrow \Delta T_f=2(-1.86)(7.2)[/tex]
[tex]\\ \tt{:}\dashrightarrow \Delta T_f=-26.7°C[/tex]