Deck 8: Chemical Equations

Question 1

The following reaction: NaOH + HCl $\rarr$ NaCl + H₂O,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Answer 1

double-displacement.

Question 2

The following reaction: CaCO₃ $\rarr$ CaO + CO₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Answer 2

decomposition.

Question 3

Given the unbalanced equation: CO₂ $\rarr$ C + O₂. When properly balanced,the sum of the balancing coefficients is

A)3
B)5
C)6
D)8

Answer 3

3

Question 4

The following reaction: F₂ + 2KBr $\rarr$ 2KF + Br₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 5

Given the unbalanced equation: CH₄ + O₂ $\rarr$ CO₂ + H₂O. When properly balanced,the sum of the balancing coefficients is

A)6
B)8
C)10
D)12

Question 6

The following reaction: Na₂CO₃ + CaCl₂ $\rarr$ 2NaCl + CaCO₃,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 7

Given the unbalanced equation: H₂O $\rarr$ H₂ + O₂. When properly balanced,the sum of the balancing coefficients is

A)4
B)5
C)6
D)7

Question 8

Given the unbalanced equation: KOH + HBr $\rarr$ KBr + H₂O. When properly balanced,the sum of the balancing coefficients is

A)3
B)4
C)5
D)8

Question 9

The following reaction: K + NaBr $\rarr$ KBr + Na,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 10

The following reaction: LiOH + HCl $\rarr$ LiCl + H₂O,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 11

Given the unbalanced equation: C₂H₂ + O₂ $\rarr$ CO₂ + H₂O. When properly balanced,the sum of the balancing coefficients is

A)10
B)11
C)12
D)13

Question 12

Given the unbalanced equation: AgNO₃ + CaCl₂ $\rarr$ AgCl + Ca(NO₃)₂. When properly balanced,the sum of the balancing coefficients is

A)4
B)5
C)6
D)7

Question 13

Given the unbalanced equation: Zn + HCl $\rarr$ ZnCl₂ + H₂. When properly balanced,the sum of the balancing coefficients is

A)4
B)5
C)6
D)7

Question 14

The following reaction: C + O₂ $\rarr$ CO₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 15

Given the unbalanced equation: Na + H₂O $\rarr$ NaOH + H₂. When properly balanced,the sum of the balancing coefficients is

A)4
B)5
C)6
D)7

Question 16

Given the unbalanced equation: KClO₃ $\rarr$ KCl + O₂. When properly balanced,the sum of the balancing coefficients is

A)6
B)7
C)8
D)9

Question 17

Given the unbalanced equation: Al + CuSO₄ $\rarr$ Al₂(SO₄)₃ + Cu. When properly balanced,the sum of the balancing coefficients is

A)6
B)7
C)8
D)9

Question 18

The following reaction: Mg + FeO $\rarr$ MgO + Fe,is an example of

A)combination.
B)cecomposition.
C)single-displacement.
D)double-displacement.

Question 19

Given the unbalanced equation: PbCl₂ + Na₂CrO₄ $\rarr$ PbCrO₄ + NaCl. When properly balanced,the sum of the balancing coefficients is

A)2
B)3
C)4
D)5

Question 20

Given the unbalanced equation: Mg + AgNO₃ $\rarr$ Mg(NO₃)₂ + Ag. When properly balanced,the sum of the balancing coefficients is

A)4
B)6
C)8
D)10

Question 21

In the reaction: CuSO₄ + BaBr₂ $\rarr$ CuBr₂ + BaSO₄

A)BaBr₂ and BaSO₄ are reactants
B)BaSO₄ and CuBr₂ are products
C)CuSO₄ and BaSO₄ are reactants
D)CuSO₄ and BaBr₂ are products

Question 22

The following reaction: 2Al + 3O₂ $\rarr$ Al₂O₃,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 23

In the expression,3CaBr₂,

A)2 and 3 are subscripts
B)2 and 3 are coefficients
C)2 is a subscript and 3 is a coefficient
D)3 is a subscript and 2 is a coefficient

Question 24

The reaction: CH₄ + 2O₂ $\rarr$ CO₂ + 2H₂O + 890.4 kJ,is

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 25

In the reaction: 2KClO₃ $\rarr$ 2KCl + 3O₂

A)KClO₃ and KCl are reactants
B)KCl and O₂ are reactants
C)KClO₃ is a product
D)KCl and O₂ are products

Question 26

The following reaction: H₂ + I₂ $\rarr$ 2HI,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 27

The reaction: N₂ + O₂ + 182.6 kJ $\rarr$ 2NO,is

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 28

The reaction: 2C + 3H₂ $\rarr$ C₂H₆ + 84.0 kJ,is

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 29

In the following reaction: Ba + MgO $\rarr$ Mg + BaO

A)Mg and BaO are products
B)Mg and MgO are products
C)Ba and MgO are products
D)Ba and Mg are products

Question 30

The following reaction: 2FeO $\rarr$ 2Fe + O₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 31

In the expression,2AlCl₃,

A)2 and 3 are subscripts
B)2 and 3 are coefficients
C)2 is a subscript and 3 is a coefficient
D)3 is a subscript and 2 is a coefficient

Question 32

The reaction: 2C + H₂ + 227.4 kJ $\rarr$ C₂H₂,is

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 33

Natural gas is primarily composed of

A)butane.
B)propane.
C)octane.
D)methane.

Question 34

The following reaction: 2H₂ + O₂ $\rarr$ 2H₂O,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 35

The following reaction: MgCl₂ $\rarr$ Mg + Cl₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 36

In the following reaction: KOH + CuNO₃ $\rarr$ KNO₃ + CuOH

A)KOH and KNO₃ are reactants
B)KNO₃ and CuOH are reactants
C)CuOH and KOH are products
D)KOH and CuNO₃ are reactants

Question 37

The combustion of hydrocarbon fuels is

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 38

The following reaction: 2KClO₃ $\rarr$ 2KCl + 3O₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 39

The following reaction: NaCl + AgNO₃ $\rarr$ AgCl + NaNO₃,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 40

The following reaction: Ca + 2H₂O $\rarr$ Ca(OH)₂ + H₂,is an example of

A)combination.
B)decomposition.
C)single-displacement.
D)double-displacement.

Question 41

When solutions of an acid and a base are reacted,the products are

A)a new acid and a new base.
B)a salt and water.
C)a metal oxide and water.
D)a nonmetal oxide and water.

Question 42

The reaction of KOH and HCl produces

A)KOH and HCl
B)KH and HClO
C)HOH and KCl
D)KClO and KH

Question 43

When the equation NH₄OH + H₂SO₄ $\rarr$ (NH₄)₂SO ₄ + H₂O is balanced,a term in the balanced equation is

A)2H₂SO₄
B)NH₄OH
C)2(NH₄)₂SO₄
D)2HOH

Question 44

The products of the complete combustion of the fossil fuel coal are

A)carbon monoxide and water.
B)carbon dioxide and water.
C)carbon monoxide and hydrogen.
D)carbon dioxide and hydrogen.

Question 45

The reaction: Ba + CuO $\rarr$ BaO + Cu,will occur if

A)Cu is more active than Ba
B)Ba is more active than Cu
C)Ba is more active than O
D)O is more active than Cu

Question 46

Given the reaction: 4NH₃ + 3O₂ $\rarr$ 2N₂ + 6H₂O.How many moles of N₂ are produced when1.0 mole of NH₃ is consumed?

A)0.50
B)1.0
C)2.0
D)4.0

Question 47

Which of the following statements is not true during a chemical reaction?

A)Total mass is conserved
B)The total number of atoms is conserved
C)The total number of molecules is conserved
D)Energy is involved

Question 48

The products of the complete combustion of the hydrocarbon methane are

A)carbon monoxide and water.
B)carbon dioxide and water.
C)carbon monoxide and hydrogen.
D)carbon dioxide and hydrogen.

Question 49

When a metal reacts with hydrochloric acid

A)a hydroxide is produced.
B)a new acid is produced.
C)hydrogen gas is produced.
D)a metal oxide is formed.

Question 50

When the equation Al + O₂ $\rarr$ Al₂O₃ is balanced,a term in the balanced equation is

A)2Al
B)2Al₂O₃
C)3Al
D)2O₂

Question 51

When the equation Cr₂S₃ + HCl $\rarr$ CrCl₃ + H₂S is balanced,a term in the balanced equation is

A)3HCl
B)CrCl₃
C)3H₂S
D)2Cr₂S₃

Question 52

A combustion reaction will always involve the release of

A)sound.
B)heat.
C)oxygen gas.
D)steam.

Question 53

Given the reaction: 2KClO₃ $\rarr$ 2KCl + 3O₂.How many moles of O₂ are produced when 4.0 moles of KCl are produced?

A)1.5
B)3.0
C)4.5
D)6.0

Question 54

When the equation H₂ + V₂O₅ $\rarr$ V + H₂O is balanced,a term in the balanced equation is

A)2V₂O₅
B)3H₂O
C)2V
D)10 H₂

Question 55

The reaction of ZnBr₂ and Ba(OH)₂ produces

A)ZnO and BaBrH
B)ZnBa and BrOH
C)ZnBr₂ and Ba(OH)₂
D)BaBr₂ and Zn(OH)₂

Question 56

The reaction: Cl₂ + 2KBr $\rarr$ 2KCl + Br₂,will occur if

A)K is more active than Cl
B)Cl is more active than Br
C)K is more active than Br
D)Br is more active than Cl

Question 57

Consider the reaction: C + O₂ $\rarr$ CO₂ + 393 kJ.When two moles of carbon react

A)393 kJ of energy is released
B)393 kJ of energy is absorbed
C)786 kJ of energy is released
D)786 kJ of energy is absorbed

Question 58

Consider the reaction: H₂ + I₂ + 12.6 kJ $\rarr$ 2 HI.When one mole of HI is produced

A)12.6 kJ of energy is absorbed
B)6.3 kJ of energy is absorbed
C)12.6 kJ of energy is released
D)6.3 kJ of energy is released

Question 59

When the equation PbO₂ $\rarr$ PbO + O₂ is balanced,a term in the balanced equation is

A)PbO₂
B)3O₂
C)3PbO
D)O₂

Question 60

When the equation H₂O₂ $\rarr$ H₂O + O₂ is balanced,a term in the balanced equation is

A)H₂O₂
B)H₂O
C)2H₂O
D)2O₂

Question 61

When the equation NH₄Cl + CaO $\rarr$ NH₃ + CaCl₂ + H₂O is balanced,the coefficient of water is

A)1
B)2
C)3
D)4

Question 62

Which of the following combinations will not form a precipitate?

A)Pb(NO₃)₂ + NaCl
B)SnCl₂ + KOH
C)FeCl₂ + (NH₄)₂S
D)NH₄Br + K₂SO₄

Question 63

The amount of energy that must be supplied to start a chemical reaction is called the

A)heat of reaction.
B)heat of fusion.
C)heat of vaporization.
D)activation energy.

Question 64

Which of the following combinations will not form new substances?

A)I₂ + KBr(NH4)2SAthe combustion of hydrocarbons are CO and H2O..n acid and the other behaves as a base.ecipitate quantitatively a
B)Fe + HCl
C)Ag + AuCl₃
D)Ca + H₂O

Question 65

What is formed when a metal oxide reacts with water?

A)A base
B)An acid
C)A salt
D)A nonmetal oxide

Question 66

When the equation CaCO₃ $\rarr$ CaO + CO₂ is balanced,the coefficient of carbon dioxide is

A)1
B)2
C)3
D)4

Question 67

Balance the following chemical equation using the smallest set of integers.The coefficient on NO₂ is: HNO₃ + S NO₂ + H₂SO₄ + H₂O

A)4
B)6
C)1
D)2

Question 68

What is formed when a nonmetal oxide reacts with water?

A)A base
B)An acid
C)A salt
D)A metal oxide

Question 69

When the equation Ag + H₂S + O₂ $\rarr$ Ag₂S + H₂O is balanced,the coefficient of water is

A)1
B)2
C)3
D)4

Question 70

Which of the following reactants would you add to an aqueous solution of ammonium sulfate in order to precipitate quantitatively all the sulfate?

A)CaCl₂
B)Al(NO₃)₃
C)Zn(C₂H₃O₂)₂
D)KBr

Question 71

In an endothermic reaction

A)the reactants have greater potential energy than the products.
B)the products have greater potential energy than the reactants.
C)the products and the reactants have the same potential energy.

Question 72

Which of the following reactants would you add to an aqueous solution of silver nitrate in order to precipitate quantitatively all the silver?

A)NaNO₃
B)NaCl
C)KF
D)H₂O

Question 73

Hydrocarbons are composed of

A)hydrogen,only.
B)carbon,only.
C)hydrogen and carbon.
D)hydrogen,carbon,and oxygen.

Question 74

Balance the following chemical equation using the smallest set of integers.The coefficient on H₂O is: I₂ + Cl₂ + H₂O HIO₃ + HCl

A)1
B)5
C)6
D)2

Question 75

In an exothermic reaction

A)the reactants have greater potential energy than the products.
B)the products have greater potential energy than the reactants.
C)the products and the reactants have the same potential energy.

Question 76

Reactions which liberate heat are

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 77

When the equation Al(OH)₃ + H₂SO₄ $\rarr$ Al₂(SO₄)₃ + H₂O is balanced,the sum of the balancing coefficients is

A)5
B)7
C)11
D)12

Question 78

Which is endothermic?

A)Freezing water
B)Burning wood
C)Condensing water vapor
D)Melting ice

Question 79

Reactions which absorb heat are

A)endothermic.
B)exothermic.
C)isothermic.
D)protothermic.

Question 80

Which is exothermic?

A)Boiling water
B)Melting ice
C)Condensing water vapor
D)The reaction inside an ice pack