GOB Homework Week 2

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Question #1

Which of the following is an oxidation-reduction reaction?

A CaCl2 + Na2SO4 → CaSO4 + 2NaCl

B N2 + O2 → 2NO

C AgNO3 + NaCl → AgCl + NaNO3

D Al2(SO4) 3 + 6KOH → 2Al(OH)3 + 3K2SO4

E KOH + HNO3 → H2O + KNO3

Question #2

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 4 moles

B 2 moles

C 6 moles

D 5.710 moles

E 8 moles

Question #3

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

A 4.41 moles

B 75.0 moles

C 4.17 moles

D 1.35 x 103 moles

E 7.50 moles

Question #4

The following reaction is an example of a ________ reaction.

C5H8 + 7O2 → 5CO2 + 4H2O

A single replacement

B decomposition

C combustion

D double replacement

E combination

Question #5

Calculate the molar mass of magnesium chloride, MgCl2.

A 70.0 g

B 125.9 g

C 24.3 g

D 95.3 g

E 59.8 g

Question #6

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

A double replacement

B decomposition

C single replacement

D combustion

E combination

Question #7

What is the classification for this reaction?

SO3 + H2O → H2SO4

A replacement

B combination

C decomposition

D combustion

E double replacement

Question #8

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

A 0.111 moles

B 2.61 x 103 moles

C 0.172 moles

D 0.119 moles

E 0.0861 moles

Question #9

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

A 6.02 x 1023 moles

B 4.00 moles

C 1.00 mole

D 0.500 mole

E 3.00 moles

Question #10

The molar mass of chlorine gas is 35.5 g.

A TRUE

B FALSE

Question #11

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

2H2 + O2 → 2H2O

A 2.02 g

B 0.202 g

C 0.180 g

D 0.101 g

E 4.04 g

Question #12

How many grams of NO are required to produce 145 g of N2 in the following reaction?

4NH3 + 6NO → 5N2 + 6H2O

A 155 g

B 125 g

C 129 g

D 145 g

E 186 g

Question #13

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 0.589 g

B 84.4 g

C 107.9 g

D 58.9 g

E 169.9 g

Question #14

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 11.3 g

B 102 g

C 5.67 g

D 10.0 g

E 34.0 g

Question #15

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

A 38.0 g.

B 114.2 g.

C 74.1 g.

D 58.1 g.

E 57.1 g.

Question #16

One mole of helium gas weighs

A 2.00 g.

B 3.00 g.

C 8.00 g.

D 4.00 g.

E 1.00 g.

Question #17

In this reaction, what is the substance oxidized?

Zn + 2 HCl → ZnCl2 + H2

A hydrogen

B chlorine

C zinc chloride

D zinc

E oxygen

Question #18

The following is a double replacement reaction.
2C2H2 + 5O2 → 4CO2 + 2H2O

A TRUE

B FALSE

Question #19

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

2H2O electricity 2H2 + O2

A combination

B double replacement

C decomposition

D combustion

E single replacement

Question #20

What type of reaction is: CH4 + 2O2 → CO2 + 2H2O + 218 kcal ?

A a decomposition reaction

B a single replacement reaction

C an exothermic reaction

D an endothermic reaction

E a combination reaction

Question #21

Avogadro’s number is the number of grams in a mole.

A TRUE

B FALSE

Question #22

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

A 6.02 x 1023

B 2.41 x 1023

C 4

D 2.41 x 1024

E 1.51 x 1023

Question #23

In this reaction, what is the coefficient for calcium oxide?

CaO + CO2 → CaCO3

A 3

B 5

C 2

D 1

E 4

Question #24

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 6.0 moles.

B 2.0 moles.

C 4.0 moles.

D 1.0 mole.

E 3.0 moles.

Question #25

The molar mass of silver is 47 g.

A TRUE

B FALSE

Question #26

Calculate the molar mass of potassium chloride, KCl.

A 19.0 g

B 54.5 g

C 67.4 g

D 6.74 g

E 74.6 g

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