Answer:
What ever the other person said
Explanation:
Find the mass of an object with a density of 2.01g/mL and a volume of 3.77mL
Answer:
7.58 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 2.01 × 3.77 = 7.5777
We have the final answer as
7.58 gHope this helps you
Determine the oxidation number of chlorine in CI2 with the steps
Answer: The oxidation number of chlorine in [tex]Cl_2[/tex] is zero
Explanation:
Oxidation number or oxidation state : It represent the number of electrons lost or gained by the atoms of an element in a compound.
Rules for Oxidation Numbers are :
1. The oxidation number of a free element is always zero.
2. The oxidation number of a monatomic ion equals the charge of the ion.
3. The oxidation number of oxygen (O) in compounds is usually -2.
4. The oxidation number of a Group 17 element in a binary compound is -1.
5. The oxidation number of Hydrogen (H) is +1, but it is -1 in when combined with less electronegative elements.
6. The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.
7. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.
As [tex]Cl_2[/tex] exists as a free molecule, its oxidation state is zero.
Pls help if you can
(It’s actually science i just couldn’t find it)
Answer:
Here you go!!
Explanation:
help help
What are the cells that respond to stimuli called?
Answer:
receptors which detect stimuli changes in the environment
Explanation:
How many liters of carbon dioxide are formed from the complete decomposition of 50.0 g of iron (III) carbonate at STP?
Answer:
V = 1.57 L
Explanation:
Given data:
Mass of iron(III) carbonate = 50.0 g
Volume of CO₂ formed = ?
Temperature = standard = 273 K
Pressure = standard = 1 atm
Solution:
Chemical equation:
Fe₂(CO₃)₃ → Fe₂O₃ + 3CO₂
Number of moles of Fe₂(CO₃)₃ :
Number of moles = mass/molar mass
Number of moles = 50.0 g /235.8 g/mol
Number of moles = 0.21 mol
Now we will compare the moles of Fe₂(CO₃)₃ and CO₂.
Fe₂(CO₃)₃ : CO₂
1 : 3
0.21 : 1/3×0.21 = 0.07 mol
Volume of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm × V =0.07 mol × 0.0821 atm.L/mol.K × 273 K
V = 1.57 atm.L / 1 atm
V = 1.57 L
calculate the packing efficiency of simple cubic unit cell.
Answer:
52.4%
Explanation:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %
What is the molar concentration (in moles/L) of a solution made with 3.744 g of Mg(NO3)2 dissolved in enough water to make 50.0 mL of solution?
Answer:
The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is [tex]0.5 \frac{moles}{L}[/tex]
Explanation:
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
In this case:
Mg: 24.3 g/moleN: 14 g/moleO: 16 g/moleSo, the molar mass of Mg(NO₃)₂ is:
Mg(NO₃)₂= 24.3 g/mole + 2*(14 g/mole + 3*16 g/mole)= 148.3 g/mole
So, if you have 3.744 g of Mg(NO₃)₂, you can apply the following rule of three: if 148.3 grams of Mg(NO₃)₂ are present in 1 mole, 3.744 grams in how many moles are present?
[tex]moles=\frac{3.744 grams*1mole}{148.3 grams}[/tex]
moles= 0.025
Then you have:
number of moles=0.025volume= 50 mL= 0.05 L (being 1,000 mL= 1 L)Replacing in the definition of molarity:
[tex]molarity=\frac{0.025 moles}{0.05 L}[/tex]
you get:
[tex]molarity=0.5 \frac{moles}{L}[/tex]
The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is [tex]0.5 \frac{moles}{L}[/tex]
The molar concentration of the solution is 0.506 M
The molar concentration of a solution is known as molarity. The molarity of a solution is defined as the moles of a solute per liter of a solution.
It can be expressed as:
[tex]\mathbf{Molarity = \dfrac{moles \ of \ solute}{volume \ of \ the \ solution}}[/tex]
The molar mass of magnesium nitrate Mg(NO3)2 = 148.3 g/molThe mass of the solute Mg(NO3)2 = 3.744 gThe relation used in determining the number of moles is:
[tex]\mathbf {number \ of \ moles = \dfrac{mass}{molar \ mass}}[/tex]
[tex]\mathbf {number \ of \ moles = \dfrac{3.744 \ g}{148.3 \ g/mol}}[/tex]
[tex]\mathbf {number \ of \ moles = 0.0253 \ g/mol}[/tex]
∴
[tex]\mathbf{Molarity = \dfrac{moles \ of \ solute}{volume \ of \ the \ solution}}[/tex]
[tex]\mathbf{Molarity = \dfrac{0.0253 \ g/mol}{0.05 \ L}}[/tex]
[tex]\mathbf{Molarity =0.506 \ M}[/tex]
Therefore, we can conclude that the molar concentration of the solution is 0.506 M
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An unknown organic compound composed of carbon, hydrogen, and oxygen was analyzed and found to be 50.84% C, 8.53% H, and the rest oxygen. What is the empirical formula
In every 100g of that compund there is 50.84 g of C, 8.53 g H and (100-59.37) g = 40.63 g of O.
Step 1: Convert each element's mass in moles. To do that we need to divide each element's mass by their respective molar mass.
For Carbon.
[tex]C = \frac{50.84}{12} = 4.24 mol [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{1} = 8.53 mol [/tex]
For Oxygen.
[tex]O = \frac{40.63}{16} = 2.54 mol [/tex]
Step 2: Divide each of the numbers by the smallest number.
For Carbon.
[tex]C = \frac{4.24}{2.54} = 1.7 [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{2.54} = 3.36 [/tex]
For Oxygen.
[tex]O = \frac{2.54}{2.54} = 1 [/tex]
Step 3: So the empirical formula will be.
[tex] C_{1.7} H_{3.36} O_1 [/tex]
But using decimal will be messy. So we multiply the numbers by 3. The right empirical formula will be.
[tex] C_{5} H_{10} O_3 [/tex]
The empirical formula of an organic compound that contains 50.84% C, 8.53% H, and the rest oxygen is C₅H₁₀O₃.
First, we have to determine the mass percentage of oxygen, knowing that C, H and O amount to the 100% of the compound.
[tex]C + H + O = 100\%\\O = 100\% - C - H\\O = 100\% - 50.84\% - 8.53\% = 40.63\%[/tex]
Then, we divide each mass percentage by the atomic mass of the element.
[tex]C: 50.84/12.01 = 4.23\\H: 8.53/1.01 = 8.45\\O: 40.63/16.00 = 2.54[/tex]
Afterwards, we divide all the numbers by the smallest one, i.e. 2.54.
[tex]C: 4.23/2.54 = 1.66\\H: 8.45/2.54 = 3.33\\O: 2.54/2.54 = 1[/tex]
Finally, we multiply all the numbers by 3, so that they are all integers.
[tex]C: 1.66 \times 3 \approx 5\\H: 3.33 \times 3 \approx 10\\O: 1 \times 3 = 3[/tex]
The empirical formula of the organic compound is C₅H₁₀O₃.
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What is the wavelength (in nm) of
blue light that has a frequency of
6.69 x 1014 s=?? (c = 3.00 x 108 m/s)
Answer:
λ = 0.45×10⁻⁶ m
Explanation:
Given data:
Wavelength of blue light = ?
Frequency of blue light = 6.69×10¹⁴ s⁻¹
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = λ × 6.69×10¹⁴ s⁻¹
λ = 3.00×10⁸ m/s / 6.69×10¹⁴ s⁻¹
λ = 0.45×10⁻⁶ m
A student predicted the reaction between hydrogen and oxygen gas would yield 125 of water. However, after measuring the water formed in the reaction, student determined that only 110 of water was actually formed. What is the percent yield of this reaction ?
Help
What is the mass of 0.2 mole of oxygen atoms.
Please answer step by step.
[tex]\huge\boxed{3.2 Grams}[/tex]
_____________________________________Moles:Moles is the unit which measures the amount of substance in the System International (SI). A mole is the amount of substance that contains the same amount of substance as the amount of substance exactly in exactly 12 g of carbon-12. C-12 is the standard to measure moles.
I have attached the Equations for moles.
_____________________________________For this question we will use the formula,
[tex]Moles = \frac{Given Mass}{Atomic Mass}[/tex]
Rearrange the equation,
[tex]Mass = (Moles)x(Atomic Mass)[/tex]
Given:
Moles = 0.2
Molecular Mass of Oxygen Atom(Not molecule) = 16
Thus,
[tex]Mass = (0.2)x(16)\\\\Mass = 3.2 grams[/tex]
The mass of 0.2 moles of oxygen atom is 3.2 grams.
_____________________________________Best Regards,'Borz'Acetaminophen is the active ingredient in Tylenol.
a. Write the molecular formula of the compound.
b. What is the hybridization state of each C, N, and O atom?
Explanation:
a. Write the molecular formula of the compound.
Acetaminophen contains 8 carbon atoms, 9 Hydrogen atoms, 1 Nitrogen atom and 2 Oxygen atoms.
The molecular formular is given as; C8H9NO2
b. What is the hybridization state of each C, N, and O atom?
From the image attached;
All the carbon atoms in the benzene ring has hybridization of sp2.
The carbon that is doubly bonded (carbonyl) to the oxygen has hybridization of sp2
The last carbon to the right has hybridization of sp3
The hybridization of nitrogen in the compound is sp3 hbridized.
Oxygen atom in alcohol is sp3 hybridised
Oxgen in the carbonyl group is sp2 hybridized.
The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ.
23 2S (s) + 3O (g) 2SO (g
The enthalpy change accompanying the reaction of 0.95 g of S is -11.85 kJ
Further explanationGiven
ΔH° for the reaction is -790 kJ
Required
The enthalpy change
Solution
Reaction
2S (s) + 3O₂(g) = 2SO₃ (g)
mol of S(MW=32 g/mol) :
[tex]\tt mol=\dfrac{0.95}{32}=0.03[/tex]
For 2 mol S, the entalphy = -790kJ
The enthalpy change for 0.03 mol :
[tex]\tt \dfrac{0.03}{2}\times -790~kJ=-11.85~kJ[/tex]
The enthalpy change accompanying the reaction will be "-11.85 kJ".
Given:
Value of ΔH°,
-790 kJAccording to the question,
→ [tex]2S(s) +3O_2(g) =2SO_3(g)[/tex]
Mol of S will be:
= [tex]\frac{0.95}{32}[/tex]
= [tex]0.03[/tex]
hence,
The enthalpy change for 0.03 mol will be:
= [tex]\frac{0.03}{2}\times -790[/tex]
= [tex]-11.85 \ kJ[/tex]
Thus the answer above is correct.
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calculate the mass percent of water in CaCrO4.H2O
Answer:
10.35%
Explanation:
Find the molar mass of water, using your periodic table: 18.02 g. Then find the molar mass of the total substance: 174.10 g.
Divide the molar mass of water by the molar mass of the total substance and multiply 100%. Doing this, you get 10.35%.
write the detailed structure of
A. C2H6 B. C4H10 C. C6H14 D. C7H16
A.
H₃C-CH₃
this is called ethane
B.
H₃C-CH₂-CH₂-CH₃
this is called butane
C.H₃C-CH₂-CH₂-CH₂-CH₂-CH₃
this is called hexane
D.
H₃C-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃
this is called heptane
Answer:
1. a) Ethane (C2H6)
2. b) Butane (C4H10 )
3. c) Hexane (C6H14)
4. d) Heptane (C7H16)
Carbonic acid (H2CO3) forms when carbon dioxide (CO2) dissolves in water
according to this equation:
CO2 + H2O
H2CO3
How many moles of CO2 must dissolve in excess water to produce 12 moles of
H2CO3?
Enter your answer as a number only; no units.
Answer:
12 molcules
Explanation:
distruibtive property.
Where are all metalloid found in this periodic table?
Answer:
Explanation:
THe GrEen OnEs
Answer:
They are in the green "staircase"
Explanation:
these elements are the dividers between metals (on the left of them) and non metals (on the right of them), they have some of the properties of both groups
The temperature of a plastic cup is 70 °F. It is filled with water that is
40 °F. Which of the following describes how thermal energy is
transferred?
Answer:
From the plastic cup to the water
Explanation:
The thermal energy is transferred from the plastic cup to the water inside the cup.
This is because thermal energy moves from a body at high temperature to one at lower temperature.
Thermal energy is the energy due to the motion of the particles of a medium. An increase in thermal energy leads to a rise in the average kinetic energy of the system. It moves over a gradient usually from a body with a high temperature to one at a lower temperature.how many moles of CO2 are in 210 liters at STP of the compound
Answer:
9.4 mol CO₂
General Formulas and Concepts:
Chemistry - Gas Laws
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:
Step 1: Define
210 L CO₂ at STP
Step 2: Identify Conversions
22.4 L = 1 mol at STP
Step 3: Convert
[tex]210 \ L \ CO_2(\frac{1 \ mol \ CO_2}{22.4 \ L \ CO_2} )[/tex] = 9.375 mol CO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
9.375 mol CO₂ ≈ 9.4 mol CO₂
Do you think chemistry has something to do with your life?In not less than 5 sentences but not more than 10 sentences try to identify situations during the day in which chemistry somehow played a part
Answer:
Chemistry can be applicable in many aspects which are
i) At school, through getting knowledge you can assess different aspect of chemistry, eg production of Chemicals.
ii) At hospital, also chemistry can be applicable in hospital because most of medicine and other materials are made up from chemistry application.
iii) Agriculture, through agricultural materials it simply because you can get more efficient through planted by using manures and fertilizer which are made up from chemistry application.
PLEASE HELP URGENT!!
c) 2Al(s) + 3C12 (g) → 2AICI3
Reactant Side-
Product Side-
Oxidizing Agents
Reducing Agent
Answer:
Reactant Side = Al + Cl₂
Product Side = AlCl₃
Oxidizing Agents = chlorine
Reducing Agent = aluminum
Explanation:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
In this chemical equation Al and Cl₂ are reactants while AlCl₃ is product.
2Al° + 3Cl₂° → 2Al⁺³Cl⁻¹₃
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
In given reaction Al is oxidized because oxidation increase from zero to +3. It is thus reducing agent.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
In given reaction chlorine is reduced because its oxidation state is decreased from zero to -1. Chlorine is oxidizing agent.
Oxidizing agents:
Oxidizing agents oxidize the other elements and itself gets reduced.
Reducing agents:
Reducing agents reduced the other element are it self gets oxidized.
Between these three liquids, which one would burn through this website's new "interactive" advertising system the fastest? (asking for a friend)
A. Molten lava
B. Hydrochloric acid
C. Nitric acid
for reference assume the "interactive" advertisements are made of the materials in a standard monitor, a visual display, circuitry, casing, and power supply
Answer:
Most likely A. Molten lava, since it straight up melts the equipment which is much faster than chemicals dissolving the equipment like hydrochloric acid and nitric acid.
Explanation:
Hope this helped!
P.S. Sure, why not?
where is a tornado most likey from
Answer:
If I'm correct i believe that the answer is A.
Answer:
A. Where warm moist air masses traveling north collide with cool dry air masses traveling south
Explanation:
I got it right
Does deforestation cause the amount of carbon dioxide in the air to increase or decrease?
Answer:
Explanation:
Deforestation has an adverse affect on air by reducing the amount of oxygen and increasing the amount of carbon dioxide as well as contributing to global warming.
If an element has 3 valence electrons, what charge will likely form on its ion
The element will lose electrons to become stable if the valence shell contains 3 or fewer electrons. The production of cations is a sign of electron loss. The species having positive charge are called cations. As a result, the ion will get a positive charge.
What is ion ?An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive.
An atom will shed its valence electrons in order to become a charged ion and create an ionic bond with another atom if it lacks one to three of them.
A positive ion is created by taking electrons from a neutral atom, whereas a negative ion is created by adding electrons to a neutral atom. The quantity of protons remains constant during the formation of an ion.
Thus, the ion will get a positive charge.
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what is the atomic mass of an atom equal to?
Answer: A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
Select the correct answer. How does a catalyst increase the speed of a reaction?
Answer:
A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.
Explanation:
Two nitrogen atoms form a diatomic molecule. Which type of bond is most likely to be formed in the case of a diatomic nitrogen molecule?
A. Single Bond
B.Double Bond
C.Triple Bond
D.Ionic Bond
Explanation:
It's a triple bond for nitrogen,double bond for oxygen(just saying)
A 24.63 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 31.32 g. Determine the empirical formula of the metal oxide.
Explanation:
Moles of Co = 24.63 / 58.9 = 0.418
Moles of O = (31.32 - 24.63) / 16 = 0.418
Since the mole ratio is 1 : 1, the empirical formula is CoO.
The empirical formula of the metal oxide is CaO₂.
What is the empirical formula?The empirical formula is the simplest ratio of the number of atoms participating in the formation of a compound.
The chemical formula of any compound is based on two types of formula one is molecular formulas and another one is empirical formulas. Both the molecular formula and empirical formula represent the identity and number of the atom.
Given, the mass of the sample of the cobalt = 24.63g
The mass of the metal oxide = 31.32g
From the law of the conservation of mass:
The mass of the metal oxide - Mass of cobalt = mass of the oxygen
So the mass of the oxygen = 31.32 - 24.63 = 6.69 g
If mass 59 grams of the cobalt has moles = 1
Then 24.63 g of Cobalt will have moles = 24.63/59 = 0.417 mol
Similarly, 8 grams of the oxygen gas moles = 1
Then 6.69g of the oxygen has moles = 6.69/8 = 0.8362 mol
The simplest ratio of moles for Co = 0.417/0.417 = 1
For oxygen = 0.8362/0.417 = 2
Therefore the empirical formula of the metal oxide is CaO₂.
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Which best describes the path of solar radiation? from the surface of the Earth to the Sun, where it is absorbed from the Sun to the surface of the Earth, where it is absorbed or reflected from the surface of the Earth to the Sun, where it is absorbed or reflected from the Sun to the surface of the Earth, where it is reflected
Answer:
from the Sun to the surface of the Earth, where it is absorbed or reflected
Explanation:
The solar radiation that emerges out of the sun and that reaches the surface of the Earth is sunlight. There are numerous constituents and particles present in the atmosphere that absorbs the solar radiation. These radiations are weakened by these constituents. Later, these radiations gets scattered in the atmosphere. Some amount of he solar radiation that reaches the Earth's surface is absorbed and some is reflected back.
Answer:
B
Explanation: