AnswersAA-F26 Physical ScienceBalancing Chemical Equations

Balancing Chemical Equations Answers

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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
2
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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
3

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

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
6

Substances A and B react in a ratio of A + B → AB. Colin was combining substance A and substance B to form substance AB. He added 10 g of substance A and 45 g of substance B.

A
10 g
B
35 g
C
45 g
D
55 g
7

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
8

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
9

Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?

A
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
B
The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products.
C
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products.
D
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.
10

Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation?

A
2C4H3Br + 5O2 → 4CO2 + 2H2O + 2HBr
B
C2H3Br + 5O2 → 4CO2 + H2O + 2HBr
C
C4H3Br + O2 → CO2 + H2O + HBr
D
C2H3Br + O2 → CO2 + H2O + HBr
11

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
12

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
13

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
14

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.
15

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
16

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

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