Question 1

The molar mass of potassium is

Accepted Answer

A) 19 g. 
B) 31.0 g. 
C) 6.02 × 1023 grams. 
D) 39.1 g. 
E) 15g. 
A) 19 g. 
B) 31.0 g. 
C) 6.02 × 1023 grams. 
D) 39.1 g. 
E) 15g.

Question 2

For the question(s) that follow, consider the following balanced equation.
MgS1U1B13S1U1B0NS1U1B12S1U1B0(s) + 6HS1U1B12S1U1B0O(l) → 3Mg (OH)₂(s) + 2NH₃(g)
-How many grams of H2O are needed to produce 150 g of Mg(OH)₂ ?

Accepted Answer

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

Question 3

In the reaction of hydrogen gas with oxygen gas to produce water, 16.0 g of oxygen gas can produce 9.00 g of water, given sufficient hydrogen available. 2H2 + O2 → 2H2O

Accepted Answer

A) True 
 B)False

Question 4

In this reaction, what is the coefficient for calcium oxide? 
CaO(s) + CO2(g) → CaCO₃(s)

Accepted Answer

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

Question 5

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H2

Accepted Answer

single rep

Question 6

In an endothermic reaction

Accepted Answer

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

Question 7

Loss of electrons is an oxidation.

Accepted Answer

A) True 
 B)False

Question 8

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?

Accepted Answer

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

Question 9

What is the mass of 1 mole of argon gas?

Accepted Answer

The answer of What is the mass of 1 mole...

Question 10

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

Accepted Answer

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

Question 11

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? 
Pb(NO₃)₂(aq) + NaCl(aq) → PbCl₂(s) + NaNO₃(aq)

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

Pentane (CS1U1B15S1U1B0HS1U1B112S1U1B0) reacts with oxygen (OS1U1B12S1U1B0) to form carbon dioxide (COS1U1B12S1U1B0) and water (HS1U1B12S1U1B0O) according to the following reaction. Answer the question(s) that follow about this reaction.
CS1U1B15S1U1B0HS1U1B112S1U1B0 + ? OS1U1B12S1U1B0 → ? COS1U1B12S1U1B0 + ? HS1U1B12S1U1B0O
-What is the coefficient for water in the balanced equation?

Accepted Answer

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

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

In an oxidation-reduction reaction, the substance reduced always

Accepted Answer

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

Question 16

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

Accepted Answer

A) 75.0 molecules 
B) 4.17 molecules 
C) 7.53 × 1024 molecules 
D) 2.51 × 1024 molecules 
E) 5.02 × 1024 molecules 
A) 75.0 molecules 
B) 4.17 molecules 
C) 7.53 × 1024 molecules 
D) 2.51 × 1024 molecules 
E) 5.02 × 1024 molecules

Question 17

For the question(s) that follow, consider the following balanced equation.
Mg₃NS1U1B12S1U1B0(s) + 6HS1U1B12S1U1B0O(l) → 3Mg (OH)₂(s) + 2NH₃(g)
-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?

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

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

Question 20

One mole of helium gas has a mass of

Accepted Answer

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

Exam 7: Chemical Reactions and Quantities

The molar mass of potassium is

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

In the reaction of hydrogen gas with oxygen gas to produce water, 16.0 g of oxygen gas can produce 9.00 g of water, given sufficient hydrogen available. 2H2 + O2 → 2H2O

In this reaction, what is the coefficient for calcium oxide? CaO(s) + CO2(g) → CaCO₃(s)

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H2

In an endothermic reaction

Loss of electrons is an oxidation.

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?

What is the mass of 1 mole of argon gas?

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

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO₃)₂(aq) + NaCl(aq) → PbCl₂(s) + NaNO₃(aq)

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

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

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

In an oxidation-reduction reaction, the substance reduced always

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

For the question(s) that follow, consider the following balanced equation. Mg₃N2(s) + 6H2O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -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?

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

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

One mole of helium gas has a mass of

Chemistry in Our Lives

Chemistry and Measurements

Energy and Matter

Atoms

Nuclear Chemistry

Ionic and Molecular Compounds

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Hydrocarbons

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Lipids

Amines and Amides

Amino Acids and Proteins

Enzymes and Vitamins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

Filters

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

In this reaction, what is the coefficient for calcium oxide? CaO(s) + CO₂(g) → CaCO₃(s)

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H₂

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?

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

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

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

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

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -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?

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