Deck 7: Chemical Reactions and Quantities

Question 1

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for

A)1
B)2
C)3
D)4
E)5

Answer 1

3

Question 2

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride?

A)1
B)2
C)3
D)4
E)5

Answer 2

2

Question 3

In this reaction, when the equation is correctly balanced, what is the correct coefficient for calcium oxide?

A)1
B)2
C)3
D)4
E)5

Answer 3

1

Question 4

What is the coefficient of hydrogen, , when the following equation is balanced?

A)1
B)2
C)3
D)4
E)5

Question 5

Which of the following is an oxidation-reduction reaction?

A)
B)
C)
D)
E)

Question 6

What is the classification for this balanced reaction?

A)double replacement
B)decomposition
C)combination
D)combustion
E)single replacement

Question 7

Which of the following gives the balanced equation for this reaction?

A)
B)
C)
D)
E)

Question 8

What is the classification for this reaction?

A)decomposition
B)double replacement
C)combination
D)single replacement
E)combustion

Question 9

What coefficient is placed in front of to complete the balancing of the following equation?

A)7
B)1
C)3
D)5
E)9

Question 10

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

A)doubled.
B)dependent on the temperature.
C)the same.
D)decreased by one.
E)increased by one.

Question 11

The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction.

A)combustion
B)decomposition
C)double replacement
D)single replacement
E)combination

Question 12

What is the coefficient for carbon dioxide in the balanced equation?

A)2
B)4
C)5
D)6
E)8

Question 13

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction?

A)combustion
B)endothermic
C)single replacement
D)double replacement
E)combination

Question 14

What is the coefficient for water in the balanced equation?

A)2
B)4
C)5
D)6
E)8

Question 15

In a ________ reaction, two or more elements or compounds form one product.

A)combination
B)combustion
C)decomposition
D)single replacement
E)double replacement

Question 16

A chemical equation is balanced when

A)the total number of ions is the same in reactants and products.
B)the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products.
C)the number of atoms of each element is the same in reactants and products.
D)the charge on each atom is the same in reactants and products.
E)the total number of molecules is the same in reactants and products.

Question 17

What is the coefficient for oxygen in the balanced equation?

A)2
B)4
C)5
D)6
E)8

Question 18

Which of the following correctly gives the correct coefficients for the reaction below?

A)2, 4, 2, 8
B)1, 4, 1, 4
C)2, 4, 2, 4
D)1, 2, 1, 4
E)1, 1, 1 ,1

Question 19

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride?

A)1
B)2
C)3
D)4
E)5

Question 20

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?

A)combination
B)combustion
C)single replacement
D)double replacement
E)endothermic

Question 21

Which of the following describes an oxidation reaction?

A)gain of electrons or loss of H
B)loss of electrons or gain of hydrogen
C)gain of electrons or gain of oxygen
D)loss of electrons or gain of oxygen
E)loss of electrons or loss of oxygen

Question 22

Calculate the molar mass of magnesium chloride,

A) 125.9 g
B) 70.0 g
C) 59.8 g
D) 24.3 g
E) 95.2 g

Question 23

The molar mass of calcium hydroxide, is

A)58.1 g.
B)74.1 g.
C)114.2 g.
D)57.1 g.
E)38.0 g.

Question 24

Avogadro's number is the number of

A) grams in 1 mole of a substance.
B) moles in
grams of an element.
C) moles in
amu of an element.
D) amu in 1 mole of a substance.
E) particles in 1 mole of a substance.

Question 25

What is the molar mass of sucrose

A) 182 g
B) 210 g
C) 342 g
D) 29.0 g
E) 50.2 g

Question 26

How many atoms of neon are present in 1.30 moles of neon?

A)
B)
C)
D)
E)

Question 27

One mole of helium gas has a mass of

A)1.00 g.
B)2.00 g.
C)4.00 g.
D)3.00 g.
E)8.00 g.

Question 28

Calculate the molar mass of potassium chloride, KCl.

A)74.6 g
B)67.4 g
C)6.74 g
D)54.5 g
E)19.0 g

Question 29

How many moles of carbon are there in 0.500 mole of

A) moles
B) 4.00 moles
C) 1.00 moles
D) 0.500 moles
E) 3.00 moles

Question 30

What is the molar mass of copper(II) sulfate,

A) 16.0 g
B) 111.6 g
C) 159.6 g
D) 63.6 g
E) 319.2 g

Question 31

In this reaction, what is the substance oxidized?

A)hydrogen
B)zinc chloride
C)chlorine
D)zinc
E)oxygen

Question 32

The molar mass of C₃H₈O₂ is

A)52.0 g.
B)69.0 g.
C)76.0 g.
D)60.0 g.
E)29.0 g.

Question 33

What is the molar mass of sodium phosphate,

A) 308 g
B) 119 g
C) 164 g
D) 226 g
E) 354 g

Question 34

How many moles of iron are present in atoms of iron?

A)
B) 1.90 moles
C) 292 moles
D) 5.23 moles
E) 0.523 moles

Question 35

What is oxidized and what is reduced, respectively, in the following reaction?

A)
B)
C)
D)
E)

Question 36

One mole of neon has a mass of

A) 10.0 g
B) 20.2 g
C) 14.0 g
D) 30.2 g
E)

Question 37

One mole of particles of any substance contains how many particles?

A)
B)
C)
D)
E)

Question 38

In an oxidation-reduction reaction, the substance reduced always

A)becomes a charged species.
B)experiences a gain of electrons.
C)takes on oxygen atoms.
D)gives up hydrogen atoms.
E)experiences a loss of electrons.

Question 39

In an oxidation-reduction reaction, the substance oxidized always

A)experiences a loss of electrons.
B)takes on oxygen atoms.
C)experiences a gain of electrons.
D)becomes a charged species.
E)gives up hydrogen atoms.

Question 40

The molar mass of potassium is

A)
B) 31.0 g.
C) 15 g .
D) 19 g.
E) 39.1 g .

Question 41

How many grams of glucose are in 3.55 moles of glucose?

A)50.7 g
B)180. g
C)639 g
D)426 g
E)103 g

Question 42

4.00 moles of sodium have a mass of

A)44.0 g.
B)23.0 g.
C)11.0 g.
D)4.60 g.
E)92.0 g.

Question 43

In the reaction of nitrogen gas, with hydrogen gas, to form ammonia gas, , how many moles of hydrogen are needed to react with two moles of nitrogen?

A) 6 moles
B) 8 moles
C) 4 moles
D) 10 moles
E) 2 moles

Question 44

The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

A)1.0 mole.
B)2.0 moles.
C)3.0 moles.
D)4.0 moles.
E)6.0 moles.

Question 45

For the question(s)that follow, consider the following equation.

A)101 g
B)201 g
C)60.8 g
D)50.4 g
E)30.4 g

Question 46

When 4 moles of aluminum are allowed to react with an excess of chlorine gas, how many moles of aluminum chloride are produced?

A) 1 mole
B) 2 moles
C) 3 moles
D) 4 moles
E) 5 moles

Question 47

For the question(s)that follow, consider the following equation.
When 2 moles of are allowed to react, how many moles of also react?

A) 6 moles
B) 4 moles
C) 1 mole
D) 12 moles
E) 8 moles

Question 48

0.100 mole of lithium has a mass of

A)0.700 g.
B)6.94 g.
C)3.00 g.
D)0.300 g.
E)0.694 g.

Question 49

How many moles of water, H₂O, are present in 75.0 g of H₂O ?

A) 4.16 moles
B) 75.0 moles
C)
D) 7.50 moles
E) 4.41 moles

Question 50

For the question(s)that follow, consider the following equation.
When 36.0 g of react, how many grams of are produced?

A) 10.0 g
B) 102 g
C) 34.0 g
D) 5.67 g

Question 51

1.25 moles of have a mass of

A) 279 g.
B) 299 g.
C) 239 g.
D) 191 g.
E) 178 g.

Question 52

The number of moles of MgO produced when 0.20 mole of reacts completely is

A) 0.80 mole.
B) 0.10 mole.
C) 0.20 mole.
D) 0.40 mole.
E) 0.60 mole.

Question 53

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of reacted to the number of moles of produced?

A)
B)
C)
D)
Е)

Question 54

3.00 moles of have a mass of

A) 46.0 g.
B) 90.0 g.
C) 138 g.
D) 45.0 g.
E) 30.0 g.

Question 55

For the question(s)that follow, consider the following equation.
How many grams of are needed to produce 150 g of

A) 23 g
B) 18 g
C) 46 g
D) 93 g
E) 130 g

Question 56

For the question(s)that follow, consider the following equation.
What is the correct form of the conversion factor needed to convert the number of moles of to the number of moles of produced?

A)
B)
C)
D)
E)

Question 57

How many moles of are in 15.0 g of

A) 0.119 moles
B) 0.111 moles
C) 0.0861 moles
D) 0.172 moles
E) 2.61 x 10³ moles

Question 58

How many grams of are there in 0.500 mole of

A) 160 g
B) 79.9 g
C) 63.8 g
D) 51.9 g
E) 35.9 g

Question 59

How many moles of magnesium are needed to react with 0.50 mole of

A) 4.0 moles
B) 0.50 mole
C) 1.0 moles
D) 3.0 moles
E) 2.0 moles

Question 60

What is the molar mass of a substance formerly used in medicine as an antacid?

A)118 g
B)214 g
C)150. g
D)71.3 g
E)263 g

Question 61

In an endothermic reaction,

A)the products have the same energy that the reactants.
B)energy is absorbed by the system.
C)heat flows out of the system.
D)the products have less energy that the reactants.
E)the temperature of the system increases.

Question 62

If the reaction shown below is exothermic, the energy level of the reactants is

A)possibly lower, possibly higher than that of the products.
B)the same as that of the products.
C)lower than that of the products.
D)higher than that of the products.

Question 63

A)16.3 g
B)32.6 g
C)72.9 g
D)155 g
E)65.4 g

Question 64

What type of reaction is:

A)an exothermic reaction
B)a combination reaction
C)a decomposition reaction
D)an endothermic reaction
E)a single replacement reaction

Question 65

When 10.0 g of reacts, the actual yield of is 8.50 g. What is the percent yield?

A) 20.6 %
B) 8.5 %
C) 41.3 %
D) 85.0 %
E) 51.5 %

Question 66

How many kcal are produced when 32.0 g of react?

A)6.81 kcal
B)218 kcal
C)436 kcal
D)109 kcal
E)698 kcal

Question 67

When 3.05 moles of are mixed with 5.03 moles of the limiting reactant is

A)
B)
C)
D)

Question 68

A)206 g
B)132 g
C)125 g
D)165 g
E)7.35 g

Question 69

For the reaction
how many kcal are needed to form 2.00 moles

A) 68.5 kcal
B) 548 kcal
C) 190 kcal
D) 274 kcal
E) 137 kcal

Question 70

How many grams of are produced from 125 g of and excess

A)
B)
C)
D)
E)

Question 71

For the reaction:
how many kcal are needed to react

A) 274 kcal
B) 190 kcal
C) 760. kcal
D) 137 kcal
E) 380 kcal

Question 72

The ________ is the energy difference between reactants and products in a chemical reaction.

A)H reactants
B)product energy
C)H products
D)overall energy
E)heat of reaction

Question 73

Find the mass of that is produced when 10.0 grams of react with 10.0 g of HCl according to the following equation.

A)10.0 g
B)6.10 g
C)16.2 g
D)12.2 g
E)20.0 g

Question 74

When 60.0 g of reacts with excess the actual yield of is 112 g. What is the percent yield?

A)67.9 %
B)46.4 %
C)187 %
D)53.6 %

Question 75

A)125 g
B)186 g
C)145 g
D)155 g
E)129 g

Question 76

When 85.0 g of are mixed with 160 . g of how many moles of that can be produced?

A)2.50 moles
B)7.81 moles
C)5.00 moles
D)5.31 moles

Question 77

When 85.0 g of are mixed with 160 g of the limiting reactant is

A)
B)
C)
D)

Question 78

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation?

A)0.180 g
B)2.00 g
C)4.00 g
D)0.100 g
E)0.200 g

Question 79

Any reaction that absorbs 150 kcal of energy can be classified as

A)exothermic.
B)endothermic.
C)either exothermic or endothermic.

Question 80

In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below.

A)107.9 g
B)169.9 g
C)58.9 g
D)84.4 g
E)0.589 g