Deck 7: Chemical Quantities and Reactions

Question 1

Calculate the molar mass of potassium chloride,KCl.

A)74.55 g/mole
B)54.55 g/mole
C)6.745 g/mole
D)67.45 g/mole
E)19.00 g/mole

Answer 1

74.55 g/mole

Question 2

0.400 mole of sucrose, C₁₂H₂₂O₁₁ ,contains ________ moles of C.

A)12
B)6.02 × 10²³
C)5.02 × 10²³
D)2.89 × 10²⁴
E)4.80

Answer 2

4.80

Question 3

One mole of copper(II)sulfate,CuSO₄ ,contains ________ O atoms.

A)4
B)6.02 × 10²³
C)1.51 × 10²³
D)2.41 × 10²³
E)2.41 × 10²⁴

Answer 3

2.41 × 10²⁴

Question 4

One mole of neon atoms has a mass of ________.

A)6.02 × 10²³ g
B)14.01 g
C)10.01 g
D)20.18 g
E)22.99 g

Question 5

0.400 mole of sucrose, C₁₂H₂₂O₁₁
,contains ________ C atoms.

A)12
B)6.02 × 10²³
C)5.02 × 10²²
D)2.89 × 10²⁴
E)4.80

Question 6

One mole of copper(II)sulfate,CuSO₄ ,contains ________ moles of O.

A)4
B)6.02 × 10²³
C)1.51 × 10²³
D)2.41 × 10²³
E)2.41 × 10²⁴

Question 7

What is the molar mass of sucrose ( C₁₂H₂₂O₁₁ )?

A)29.02 g/mole
B)50.23 g/mole
C)210.0 g/mole
D)342.3 g/mole
E)182.0 g/mole

Question 8

0.100 mole of lithium has a mass of ________.

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

Question 9

The molar mass of potassium is ________.

A)19.00 g/mole
B)31.00 g/mole
C)6.02 × 10²³ g/mole
D)39.10 g/mole
E)15.02 g/mole

Question 10

Avogadro's number is the number of ________.

A)particles in 1 mole of a substance
B)amu in 1 mole of a substance
C)grams in 1 mole of a substance
D)moles in 6.02 × 10²³ g of an element
E)moles in 6.02 × 10²³ amu of an element

Question 11

What is the molar mass of Mg₃(PO₄)₂ ,a substance formerly used in medicine as an antacid?

A)71.28 g/mole
B)118.3 g/mole
C)150.3 g/mole
D)214.3 g/mole
E)262.9 g/mole

Question 12

The molar mass of C₃H₈O₂ is ________.

A)76.09 g/mole
B)60.09 g/mole
C)29.02 g/mole
D)69.02 g/mole
E)52.01 g/mole

Question 13

The molar mass of calcium hydroxide, Ca(OH)₂ ,is ________.

A)58.09 g/mole
B)57.09 g/mole
C)74.10 g/mole
D)114.2 g/mole
E)54.02 g/mole

Question 14

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

A) 10⁶ particles
B)3 × 10^-10 particles
C)3 × 10¹⁰ particles
D)6.02 × 10²³ particles
E)6.02 × 10 ^{- 23} particles

Question 15

What is the molar mass of sodium phosphate, Na₃PO₄ ?

A)69.96 g/mole
B)118.0 g/mole
C)163.9 g/mole
D)226.1 g/mole
E)354.0 g/mole

Question 16

What is the molar mass of copper(II)sulfate,CuSO₄ ?

A)16.00 g/mole
B)63.60 g/mole
C)111.6 g/mole
D)159.6 g/mole
E)319.2 g/mole

Question 17

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

A)4.41 moles
B)4.16 moles
C)75.0 moles
D)7.50 moles
E)1.35 × 10²³ moles

Question 18

The molar mass of helium is ________.

A)1.000 g
B)2.002 g
C)3.003 g
D)4.003 g
E)8.006 g

Question 19

Calculate the molar mass of magnesium chloride,MgCl₂ .

A)24.31 g/mole
B)95.21 g/mole
C)125.9 g/mole
D)59.76 g/mole
E)70.90 g/mole

Question 20

How many moles of carbon atoms are there in 0.500 mole of C₂H₆ ?

A)0.500 mole
B)1.00 mole
C)3.00 moles
D)6.02 × 10²³ moles
E)4.00 moles

Question 21

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
In the following reaction,what is the correct coefficient for aluminum chloride? Al + Cl₂ → AlCl₃

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

Question 22

What is the coefficient of hydrogen, H₂ ,when the following equation is balanced? Al + H₂SO₄ → Al₂(SO₄)₃+ ?H₂

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

Question 23

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
In this reaction,what is the coefficient for calcium oxide? CaO + CO₂ → CaCO₃

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

Question 24

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
In this reaction,what is the correct coefficient for sodium chloride? Pb(NO₃)₂ + ? NaCl → PbCl₂ + ? NaNO₃

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

Question 25

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄ ?

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

Question 26

What is the classification for this unbalanced reaction? Fe + HCl → FeCl₃ + H₂

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

Question 27

3.00 moles of NO₂ have a mass of ________.

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

Question 28

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
What is the coefficient for carbon dioxide in the balanced equation?

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

Question 29

Which of the following gives the balanced equation for this reaction? K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

A) KPO₄+ CaNO₃+ KNO₃
B) K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + 3KNO₃
C)2 K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6KNO₃
D)2k₃PO₄+ 3Ca₃(NO₃)₂ → Ca₃(PO₄)₂+ 6KNO₃
E) K₃PO₄+ Ca(NO₃)₂ → Ca₃(PO₄)₂+ KNO₃

Question 30

How many grams of K2SO4 are there in 0.123 mole of K2SO4?

A)14.7 g
B)16.6 g
C)21.4 g
D)42.8 g
E)76.3 g

Question 31

4.00 moles of sodium have a mass of ________.

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

Question 32

A chemical equation is balanced when ________.

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

Question 33

How many grams of glucose ( C₆H₁₂O₆ )are in 3.55 moles of glucose?

A)180.g
B)640.g
C)103 g
D)426 g
E)50.7 g

Question 34

Which of the following correctly gives the correct coefficients for the reaction below? N₂H₄+ H₂O₂ → N₂ + H₂O

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

Question 35

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
For the following reaction,what is the correct coefficient for the H₂? Fe + HCl → FeCl₃ + H₂

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

Question 36

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O2 → 5CO₂+ 4H₂O

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

Question 37

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

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

Question 38

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
What is the coefficient for oxygen in the balanced equation?

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

Question 39

Pentane ( C₅H₁₂ )reacts with oxygen ( O₂ )to form carbon dioxide ( CO₂ )and water ( H₂O)according to the following reaction.Answer the following question(s)about this reaction. C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O
What is the coefficient for water in the balanced equation?

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

Question 40

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃ ?

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

Question 41

In an oxidation-reduction reaction,the substance oxidized always ________.

A)takes on oxygen atoms
B)loses electrons
C)gives up hydrogen atoms
D)gains electrons
E)becomes a charged species

Question 42

For the following question(s),consider the following balanced equation. Mg₃N₂ + 6H₂O → 3Mg(OH)₂ + 2NH₃
In the reaction of nitrogen gas, N₂ ,with hydrogen gas, H₂ ,to form ammonia gas,NH3,how many moles of hydrogen are needed to react with two moles of nitrogen? N₂ + 3H₂ → 2NH₃

A)2 moles
B)4 moles
C)6 moles
D)8 moles
E)5.710 moles

Question 43

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
How many grams of magnesium are needed to react with 16 g of O₂ ?

A)0.50 g
B)1.0 g
C)12 g
D)24 g
E)48 g

Question 44

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

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

Question 45

The following reaction takes place when an electric current is passed through water.It is an example of a ________ reaction. 2H₂O 2H₂ + O₂

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

Question 46

For the following question(s),consider the following balanced equation. Mg₃N₂ + 6H₂O → 3Mg(OH)₂ + 2NH₃
When 2 moles of Mg₃N₂ are allowed to react,how many moles of H₂O also react?

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

Question 47

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

A)40.3 g
B)50.4 g
C)60.5 g
D)101 g
E)202 g

Question 48

For the following question(s),consider the following balanced equation. Mg₃N₂ + 6H₂O → 3Mg(OH)₂ + 2NH₃
What is the correct form of the conversion factor needed to convert the number of moles of H₂O to the number of moles of NH₃ produced?

A)
B)
C)
D)
E)

Question 49

For the following question(s),consider the following balanced equation. Mg₃N₂ + 6H₂O → 3Mg(OH)₂ + 2NH₃
When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂ ,how many moles of aluminum chloride are produced? 2Al + 3Cl₂ → 2AlCl₃

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

Question 50

What is the classification for this reaction? SO₃ + H₂O → H₂SO₄

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

Question 51

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is ________.

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

Question 52

The following reaction is an example of a ________ reaction. C₅H₈ + 7O₂ → 5CO₂ + 4H₂O

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

Question 53

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
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 54

In this reaction,what is the substance oxidized? Zn + 2 HCl → ZnCl2 + H2

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

Question 55

Given the following equation,what is the correct form of the conversion factor needed to convert the number of moles of O₂ to the number of moles of Fe₂O₃ produced? 4Fe + 3O₂ → 2Fe₂O₃

A)
B)
C)
D)
E)

Question 56

Which of the following is an oxidation-reduction reaction?

A)CaCl₂ + Na₂SO₄ → CaSO₄ + 2NaCl
B)KOH + HNO₃ → H₂O + KNO₃
C) N₂ + O₂ → 2NO
D) AgNO₃ + NaCl → AgCl + NaNO₃
E) Al₂(SO₄)₃ + 6KOH → 2Al(OH)₃ + 3K₂SO₄

Question 57

In an oxidation-reduction reaction,the substance reduced always ________.

A)takes on oxygen atoms
B)loses electrons
C)gives up hydrogen atoms
D)gains electrons
E)becomes a charged species

Question 58

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C + O₂ → 2CO

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

Question 59

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

A)0.101 g
B)0.180 g
C)0.201 g
D)2.01 g
E)4.02 g

Question 60

What is oxidized and what is reduced in the following reaction? 2Al + 3Br₂ → 2AlBr₃

A)Al is oxidized and Br₂ is reduced.
B)AlBr3 is reduced and Br₂ is oxidized.
C)Al is reduced and Br₂ is oxidized.
D) AlBr₃ is reduced and Al is oxidized.
E) AlBr₃ is oxidized and Al is reduced.

Question 61

Barium chloride and sodium sulfate react according to the following equation.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Answer the following question(s)about this reaction.
How many grams of sodium chloride can be produced from 50.grams of barium chloride?

A)2.0 g
B)14 g
C)28 g
D)59 g
E)208 g

Question 62

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
How many grams of H₂O are needed to produce 150 g of Mg(OH)₂ ?

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

Question 63

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
How many grams of are produced from 125 g of and excess ? + 2 → + 2 O

A)125 g
B)62.5 g
C)172 g
D)85.9 g
E)250.g

Question 64

If the reaction shown below is exothermic,the energy level of the reactants is ________. + → O

A)lower than that of the products
B)higher than that of the products
C)the same as that of the products
D)possibly lower,possibly higher than that of the products
E)higher than the activation energy of the reaction

Question 65

Answer the question(s)below about the following reaction.
2 → 2 O +
How many moles of oxygen gas can 5.0 moles of hydrogen peroxide ( H2O2)produce,if decomposition is complete?

A)5.0 moles
B)2.5 moles
C)1.0 mole
D)2.0 moles
E)10.moles

Question 66

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
How many grams of NO are required to produce 145 g of N₂ in the following reaction? 4NH₃ + 6NO → 5N₂ + 6H₂O

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

Question 67

The ________ is the minimum energy needed for a chemical reaction to begin.

A)reaction energy
B)activation energy
C)energy of reactants
D)energy of products
E)heat of reaction

Question 68

A reaction that releases energy as it occurs is classified as a(n)________.

A)endothermic reaction
B)exothermic reaction
C)oxidation-reduction reaction
D)catalyzed reaction
E)decomposition reaction

Question 69

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
When 36.0 g of H₂O react,how many grams of NH₃ are produced?

A)34.0 g
B)10.0 g
C)5.67 g
D)11.3 g
E)102 g

Question 70

Barium chloride and sodium sulfate react according to the following equation.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Answer the following question(s)about this reaction.
How many moles of barium sulfate are produced from 0.1 mole of barium chloride?

A)0.01 mole
B)0.1 mole
C)0.2 mole
D)1 mole
E)2 moles

Question 71

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

A)endothermic
B)exothermic
C)activated
D)reduction
E)oxidation

Question 72

For the following question(s),consider the following equation.
2Mg + O₂ → 2MgO
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. AgNO₃ + NaCl → AgCl + NaNO₃

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

Question 73

In this reaction,what is the correct coefficient for hydrogen gas? ? H2 + ? O2 → ? H2O

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

Question 74

Barium chloride and sodium sulfate react according to the following equation.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Answer the following question(s)about this reaction.
How many grams of barium chloride are needed to make 100.grams of barium sulfate?

A)44.9 g
B)89.2 g
C)208 g
D)233 g
E)46.6 g

Question 75

Answer the question(s)below about the following reaction.
2 → 2 O +
How many grams of water will 100.grams of hydrogen peroxide produce?

A)36.0 g
B)360.g
C)5.88 g
D)53.0 g
E)106 g

Question 76

What type of reaction is: + 2 → + 2 O + 218 kcal?

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

Question 77

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
How many grams of are produced when 125 g of reacts as shown in the following balanced equation? 4 + 6NO → 5 + 6 O

A)206 g
B)257 g
C)165 g
D)7.35 g
E)145 g

Question 78

Answer the question(s)below about the following reaction.
2 → 2 O +
This is an example of a ________ reaction.

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

Question 79

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

A)transition energy
B)activation energy
C)product energy
D)overall energy
E)heat of reaction

Question 80

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃
Find the mass of AlCl₃ that is produced when 25.0 grams of Al₂O₃ reacts with HCl according to the following equation. Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

A)155 g
B)72.9 g
C)65.3 g
D)32.6 g
E)16.3 g