Balancing Equations and Reaction Type

 

Matching

Match each item with the correct statement below.

a.

product

d.

balanced equation

b.

reactant

e.

skeleton equation

c.

chemical equation

 

 

 

____          1.   a chemical equation that does not indicate relative amounts of reactants and products

 

____          2.   a new substance formed in a chemical reaction

 

____          3.   a starting substance in a chemical reaction

 

____          4.   a concise representation of a chemical reaction

 

____          5.   an equation in which each side has the same number of atoms of each element

 

Match each item with the correct statement below.

a.

activity series of metals

c.

combustion reaction

b.

single-replacement reaction

d.

decomposition reaction

 

 

____          6.   a reaction in which a single compound is broken down into simpler substances

 

____          7.   a reaction in which oxygen reacts with another substance, often producing heat or light

 

____          8.   a reaction in which the atoms of one element replace the atoms of a second element in a compound

 

____          9.   a list of metals in order of decreasing reactivity

 

Multiple Choice

Identify the choice that best completes the statement or answers the question.

 

____          10.  What does the symbol  in a chemical equation mean?

a.

Heat is supplied to the reaction.

c.

yields

b.

A catalyst is needed.

d.

precipitate

 

 

____          11.  A skeleton equation does NOT show which of the following?

a.

the correct formulas of the reactants and products

b.

the reactants on the left, the products on the right

c.

an arrow connecting the reactants to the products

d.

the relative amounts of reactants and products

 

 

____          12.  In the chemical equation HO(aq) ® HO(l)  O(g), the  is a ____.

a.

catalyst

c.

product

b.

solid

d.

reactant

 

 

____          13.  This symbol () indicates that ____.

a.

heat must be applied

b.

an incomplete combustion reaction has occurred

c.

a gas is formed by the reaction

d.

the reaction is reversible

 

 

 

 

____          14.  A catalyst is ____.

a.

the product of a combustion reaction

b.

not used up in a reaction

c.

one of the reactants in single-replacement reactions

d.

a solid product of a reaction

 

 

____          15.  Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?

a.

P(s)  O(g) ® PO(g)

c.

P(s)  O2(g) ® PO(s)

b.

P(s)  O(g) ® PO(g)

d.

PO(s) ® P(s)  O(g)

 

 

____          16.  What are the coefficients that will balance the skeleton equation below?

AlCl + NaOH  Al(OH)  NaCl

a.

1, 3, 1, 3

c.

1, 1, 1, 3

b.

3, 1, 3, 1

d.

1, 3, 3, 1

 

 

____          17.  What are the coefficients that will balance the skeleton equation below?

N + H  NH

a.

1, 1, 2

c.

3, 1, 2

b.

1, 3, 3

d.

1, 3, 2

 

 

____          18.  When the equation Fe  Cl  FeCl is balanced, what is the coefficient for Cl?

a.

1

c.

3

b.

2

d.

4

 

 

____          19.  When the following equation is balanced, what is the coefficient for HCl?

Mg(s)  HCl(aq)  MgCl(aq)  H(g)

a.

6

c.

1

b.

3

d.

2

 

 

____          20.  Chemical equations must be balanced to satisfy ____.

a.

the law of definite proportions

c.

the law of conservation of mass

b.

the law of multiple proportions

d.

Avogadro’s principle

 

 

____          21.  The product of a combination reaction is Ba(OH). If one of the reactants is HO, what is the other reactant?

a.

BaO

c.

BaH

b.

BaO

d.

BaO

 

 

____          22.  In a combustion reaction, one of the reactants is ____.

a.

hydrogen

c.

oxygen

b.

nitrogen

d.

a metal

 

 

____          23.  Which of the following is a balanced equation representing the decomposition of lead(IV) oxide?

a.

PbO  Pb  2O

c.

PbO  2Pb  O

b.

PbO  Pb  O

d.

PbO  Pb  O

 

 

____          24.  The reaction 2Fe  3Cl  2FeCl is an example of which type of reaction?

a.

combustion reaction

c.

combination reaction

b.

single-replacement reaction

d.

decomposition reaction

 

 

 

____          25.  The equation Mg(s)  2HCl(aq)  MgCl(aq)  H(g) is an example of which type of reaction?

a.

combination reaction

c.

decomposition reaction

b.

single-replacement reaction

d.

double-replacement reaction

 

 

____          26.  The equation HPO  3KOH  KPO  3HO is an example of which type of reaction?

a.

double-replacement reaction

c.

decomposition reaction

b.

combination reaction

d.

single-replacement reaction

 

 

____          27.  The equation 2CHOH  9O  6CO  8HO is an example of which type of reaction?

a.

combustion reaction

c.

double-replacement reaction

b.

single-replacement reaction

d.

decomposition reaction

 

 

____          28.  What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?

a.

Br  NaI  NaBr  I

c.

Br  NaI  NaBrI

b.

Br  2NaI  2NaBr  I

d.

Br  NaI  NaBr  I

 

 

Short Answer

                  29.  Balance the following equation.

NaClO  NaCl  O

 

                  30.  Balance the following equation.

Mg  HPO  Mg(PO)  H

 

                  31.  Balance the following equation.

(NH)CO  NaOH  NaCO  NH  HO

 

                  32.  Balance the following equation. Complete the equation first, if necessary.

Ba  HO  Ba(OH)  H

 

                  33.  Balance the following equation.

NaPO  ZnSO  NaSO  Zn(PO)

 

                  34.  Complete and balance the following equation.

CH  O  CO

 

                  35.  Balance the following equation. Indicate whether combustion is complete or incomplete.

2CHOH  O  CO  HO

 

                  36.  Complete and balance the following equation:

KPO  BaCl