AnswersAA-F26 Physical ScienceIntroduction to Chemical Reactions

Balancing Chemical Equations Answers

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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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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
3

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
4

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.
5

The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath. AB + CD → AC + BD(15 g) (?) (?) (10 g)The total mass of the products is 50g. Which best completes the other two amounts?

A
The amount of CD is 40 g, and the amount of AC is 35 g.
B
The amount of CD is 35 g, and the amount of AC is 40 g.
C
The amount of CD and AC would be the same.
D
The amount of CD and AC is undetermined.
6

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
7

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
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

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
10

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

A
coefficients
B
subscripts
C
superscripts
D
parentheses
11

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
12

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
13

Which property of matter is conserved in chemical reactions and shown by balanced equations?

A
mass
B
volume
C
density
D
shape
14

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
15

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

A
coefficients
B
subscripts
C
superscripts
D
parentheses
16

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.
17

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
18

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
19

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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