AnswersIA-Chemistry A Survey of Chemistry AWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations Answers

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1
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Aqueous magnesium chloride and hydrogen gas are produced when solid magnesium reacts with aqueous hydrochloric acid (HCl). What is the equation for this reaction? Note: You do not need to balance the equation.

A
Mg(s) + HCl(aq) MgCl(aq) + H(g)
B
MgCl(aq) + H(g) Mg(s) + HCl(aq)
C
Mg(s) + HCl(aq) MgCl2(aq) + H2(g)
D
MgCl2(aq) + H2(g) Mg(s) + HCl(aq)
2
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What element is the catalyst in the reaction above?

Question illustration
A
H
B
N
C
O
D
Pt
3

Barium chlorate (Ba(ClO3)2) breaks down to form barium chloride and oxygen. What is the balanced equation for this reaction?

A
Ba(ClO3)2(s) BaCl2(s) + O2(g)
B
Ba(ClO3)2(s) BaCl2(s) + 3O2(g)
C
2Ba(ClO3)2(s) BaCl(s) + 6O2(g)
D
Ba(ClO)2(s) BaCl2(s) + O2(g)
4

Carbon dioxide and water are produced when pentane (C5H12) reacts with oxygen. What is the balanced equation for this reaction?

A
C5H12(g) + O2(g) CO2(g) + H2O(g)
Option A
B
C5H12(g) + O2(g) 5CO2(g) + H2O(g)
Option B
C
C5H12(g) +8O2(g) 5CO2(g) + 6H2O(g)
Option C
D
5CO2(g) + 6H2O(g) C5H12(g) + 8O2(g)
Option D
5

Which of the following is the correct word equation for the reaction described below? Mercury(II) oxide breaks down when it is heated to form oxygen gas and liquid mercury.

A
oxygen gas + mercury → mercury(II) oxide
B
mercury(II) oxide + oxygen → mercury
C
mercury → mercury(II) oxide + oxygen
D
mercury(II) oxide → oxygen + mercury
6

Which of the following is the correct word equation for the reaction described below? When sulfuric acid reacts with sodium hydroxide, sodium sulfate and water form.

A
sulfuric acid + sodium hydroxide → sodium sulfate + water
B
sulfuric acid → sodium hydroxide + sodium sulfate + water
C
sodium sulfate + water → sulfuric acid + sodium hydroxide
D
sodium sulfate + sulfuric acid → sodium hydroxide + water
7

Which of the following is the correct word equation for the reaction described below? Calcium hydroxide and hydrogen gas are produced by the reaction of calcium hydride and water.

A
calcium hydride + hydrogen → calcium hydroxide + water
B
calcium hydride + water → calcium hydroxide + hydrogen
C
calcium hydroxide + hydrogen → calcium hydride + water
D
calcium hydroxide + water → calcium hydride + hydrogen
8

Identify the information that can be included in a chemical equation. Check all of the boxes that apply.

A
how long the reaction takes to occur
B
the states of the reactants and products
C
the temperature and pressure at which the reaction was carried out
D
the relative amounts of reactants and products
E
the actual mass of product that is produced by the reaction
F
the type of catalyst that is used to speed up the reaction
G
the possibility that the reaction can go in both directions
9

Sulfur trioxide is a gas that reacts with liquid water to produce aqueous sulfuric acid, or acid rain. What is the equation for this reaction? Note: You do not need to balance the equation.

A
SO3(g) + H2O(g) H2SO4(g)
Option A
B
SO3(g) + H2O(l) H2SO4(aq)
Option B
C
H2SO4(g) SO3(g) + H2O(l)
Option C
D
S3O(g) H2SO4(s) + H2O(l)
Option D

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