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Balancing Chemical Equations Answers

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1
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The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?

Question illustration
A
FeCl3 + NH4OH Fe(OH)3 + NH4Cl
Option A
B
CH4 + O2 CO2 + H2O
Option B
C
Fe + H2SO4 Fe2(SO4)3 + H2
Option C
D
PCl5 + H2O HCl + H3PO4
Option D
2
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Which best describes the law of conservation of mass?

A
The coefficients in front of the chemicals in the reactants should be based on the physical state of the products.
B
Products in the form of gases are not considered a part of the total mass change from reactants to products.
C
When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not.
D
The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
3

Which equation is balanced?

A
Mg3N2 + H2O 3MgO + 2NH3
Option A
B
C3H8 + 5O2 H2O + 3CO2
Option B
C
Zn + 2HCl ZnCl2 + H2
Option C
D
3H2SO4 + 2Fe Fe2(SO4)3 + H2
Option D
4

One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

A
3 Mg, 2 P, 14 O, 12 H
B
Mg, 2 P, 14 O, 6 H
C
3 Mg, 8 P, 7 O, 6 H
D
6 Mg, 6 P, 2 O, 12 H
5

The equation below is for potassium oxide. 4K + O2 2K2O What is the ratio of atoms of potassium to atoms of oxygen?

Question illustration
A
1:2
B
2:1
C
4:1
D
1:4
6

Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation.How could he find the correct coefficients?

Question illustration
A
by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products
B
by counting the total atoms and making sure the number of atoms in the reactants is the same as the number of atoms in the products
C
by counting the total mass of each compound and making sure the reactants have more mass than the products
D
by counting the mass of each atom and making sure the reactants are more massive than the products
7

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

A
multiplying the subscripts in the atoms of the reactants together
B
adding the coefficient 3 in front of H2 and the coefficient 2 in front of NH3
C
changing the subscripts so they match for the total number of atoms
D
creating a chart that shows the number of atoms in the reactants and products
8

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

A
2 in front of water and 2 in front of oxygen
B
1 in front of water and 2 in front of oxygen
C
1 in front of water and 1 in front of oxygen
D
2 in front of water and 1 in front of oxygen
9

If the mass of the products measured 120 g, what would be the mass of the reactants?

A
30 g
B
60 g
C
120 g
D
240 g
10

Which is the balanced equation for V2O5 + CaS → CaO + V2S5?

A
V2O5 + CaS → CaO + V2S5
B
5V2O5 + 5CaS → 10CaO + 5V2S5
C
3V2O5 + 3CaS → 3CaO + 3V2S5
D
V2O5 + 5CaS → 5CaO + V2S5

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