Question 1

A 100-g sample of the compound below contains greater than one mole of molecules.

Accepted Answer

A) True 
 B)False

Question 2

If a synthesis has four steps and each step has a 75% yield (0.75 written as a decimal), what is the overall percent yield?

Accepted Answer

A) 75% 
B) 19% 
C) 56% 
D) 32% 
E) 42% 
A) 75% 
B) 19% 
C) 56% 
D) 32% 
E) 42%

Question 3

The molar mass of CaCO3 is greater than the molar mass of Ca(NO3)2.

Accepted Answer

A) True 
 B)False

Question 4

In the reaction: Ni2+(aq)+ Mg(s)$\rightarrow$Ni(s)+ Mg2+(aq), the species that undergoes reduction is Mg(s).

Accepted Answer

A) True 
 B)False

Question 5

A balanced chemical equation tells the number of _____ of each reactant that combine and the number of _____ of each product formed.

Accepted Answer

A) grams, grams 
B) grams, moles 
C) moles, grams 
D) moles, moles 
A) grams, grams 
B) grams, moles 
C) moles, grams 
D) moles, moles

Question 6

The subscripts in chemical formulas are changed in order to balance a chemical equation.

Accepted Answer

A) True 
 B)False

Question 7

Tin (II)fluoride can be made by the following reaction: Sn(s)+ 2 HF(g)$\rightarrow$  SnF2(s)+ H2(g). What is the maximum amount of SnF2 that can be produced when 0.480 moles of Sn are mixed with 0.720 moles of HF?

Accepted Answer

A) 0.360 moles of SnF2 
B) 0.480 moles of SnF2 
C) 0.600 moles of SnF2 
D) 0.720 moles of SnF2 
E) 1.20 moles of SnF2 
A) 0.360 moles of SnF2 
B) 0.480 moles of SnF2 
C) 0.600 moles of SnF2 
D) 0.720 moles of SnF2 
E) 1.20 moles of SnF2

Question 8

One mole of oxygen molecules contains more atoms than one mole of lead atoms.

Accepted Answer

A) True 
 B)False

Question 9

In a two-step synthesis where the first reaction has a 55% yield and the second reaction has a 24% yield, the overall percent yield of the reaction is _____% yield.

Accepted Answer

The answer of In a two-step synthesis where the first...

Question 10

How many moles of carbon dioxide are in 211 g of carbon dioxide?

Accepted Answer

A) 929 mol of CO2 
B) 4.79 mol of CO2 
C) 167 mol of CO2 
D) 0.209 mol of CO2 
A) 929 mol of CO2 
B) 4.79 mol of CO2 
C) 167 mol of CO2 
D) 0.209 mol of CO2

Question 11

How many moles of chloroethylene (C2H3Cl)contain 5.47 × 1026 molecules?

Accepted Answer

A) 3.29 × 1050 mol of C2H3Cl 
B) 5.47 × 1026 mol of C2H3Cl 
C) 909 mol of C2H3Cl 
D) 5450 mol of C2H3Cl 
A) 3.29 × 1050 mol of C2H3Cl 
B) 5.47 × 1026 mol of C2H3Cl 
C) 909 mol of C2H3Cl 
D) 5450 mol of C2H3Cl

Question 12

How many carbon atoms are in 3.85 mol of carbon?

Accepted Answer

A) 3.85 carbon atoms 
B) 23.2 carbon atoms 
C) 6.02 × 1023 carbon atoms 
D) 2.32 × 1024 carbon atoms 
E) 6.40 × 10-24 carbon atoms 
A) 3.85 carbon atoms 
B) 23.2 carbon atoms 
C) 6.02 × 1023 carbon atoms 
D) 2.32 × 1024 carbon atoms 
E) 6.40 × 10-24 carbon atoms

Question 13

In a redox reaction, the _____ agent is the substance that gets oxidized.

Accepted Answer

The answer of In a redox reaction, the _____ agent...

Question 14

The balanced reaction: 4 Fe(s)+ 3 O2(g)$\rightarrow$ 2 Fe2O3(s)is an oxidation-reduction reaction.

Accepted Answer

A) True 
 B)False

Question 15

What is the formula weight of KCl?

Accepted Answer

A) 74.55 amu 
B) 66.42 amu 
C) 36.00 amu 
D) 1386 amu 
A) 74.55 amu 
B) 66.42 amu 
C) 36.00 amu 
D) 1386 amu

Question 16

The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation.

Accepted Answer

A) True 
 B)False

Question 17

The reaction: Mg(s)+ 2 HBr(aq)$\rightarrow$MgBr2(s)+ H2(g)is an oxidation-reduction reaction.

Accepted Answer

A) True 
 B)False

Question 18

In the reaction: Ni2+(aq)+ Mg(s)$\rightarrow$Ni(s)+ Mg2+(aq), the oxidizing agent is Ni2+(aq).

Accepted Answer

A) True 
 B)False

Question 19

The mass of one ethanol (C2H6O)molecule is 7.65 × 10-23 grams.

Accepted Answer

A) True 
 B)False

Question 20

Which quantity has the greatest mass?

Accepted Answer

A) 2.0 mol of Na 
B) 2.0 mol of Na2O 
C) 2.0 mol of NaCl 
D) 2.0 mol of O2 
E) All of these quantities have the same mass. 
A) 2.0 mol of Na 
B) 2.0 mol of Na2O 
C) 2.0 mol of NaCl 
D) 2.0 mol of O2 
E) All of these quantities have the same mass.

Exam 5: Chemical Reactions

A 100-g sample of the compound below contains greater than one mole of molecules.

If a synthesis has four steps and each step has a 75% yield (0.75 written as a decimal), what is the overall percent yield?

The molar mass of CaCO3 is greater than the molar mass of Ca(NO3)2.

In the reaction: Ni2+(aq)+ Mg(s) →\rightarrow→ Ni(s)+ Mg2+(aq), the species that undergoes reduction is Mg(s).

A balanced chemical equation tells the number of _____ of each reactant that combine and the number of _____ of each product formed.

The subscripts in chemical formulas are changed in order to balance a chemical equation.

Tin (II)fluoride can be made by the following reaction: Sn(s)+ 2 HF(g) →\rightarrow→ SnF2(s)+ H2(g). What is the maximum amount of SnF2 that can be produced when 0.480 moles of Sn are mixed with 0.720 moles of HF?

One mole of oxygen molecules contains more atoms than one mole of lead atoms.

In a two-step synthesis where the first reaction has a 55% yield and the second reaction has a 24% yield, the overall percent yield of the reaction is _____% yield.

How many moles of carbon dioxide are in 211 g of carbon dioxide?

How many moles of chloroethylene (C2H3Cl)contain 5.47 × 1026 molecules?

How many carbon atoms are in 3.85 mol of carbon?

In a redox reaction, the _____ agent is the substance that gets oxidized.

The balanced reaction: 4 Fe(s)+ 3 O2(g) →\rightarrow→ 2 Fe2O3(s)is an oxidation-reduction reaction.

What is the formula weight of KCl?

The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation.

The reaction: Mg(s)+ 2 HBr(aq) →\rightarrow→ MgBr2(s)+ H2(g)is an oxidation-reduction reaction.

In the reaction: Ni2+(aq)+ Mg(s) →\rightarrow→ Ni(s)+ Mg2+(aq), the oxidizing agent is Ni2+(aq).

The mass of one ethanol (C2H6O)molecule is 7.65 × 10-23 grams.

Which quantity has the greatest mass?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

The molar mass of CaCO₃ is greater than the molar mass of Ca(NO₃)₂.

In the reaction: Ni²⁺(aq)+ Mg(s) $\rightarrow$ Ni(s)+ Mg²⁺(aq), the species that undergoes reduction is Mg(s).

A balanced chemical equation tells the number of _ of each reactant that combine and the number of _ of each product formed.

Tin (II)fluoride can be made by the following reaction: Sn(s)+ 2 HF(g) $\rightarrow$ SnF₂(s)+ H₂(g). What is the maximum amount of SnF₂ that can be produced when 0.480 moles of Sn are mixed with 0.720 moles of HF?

How many moles of chloroethylene (C₂H₃Cl)contain 5.47 × 10²⁶ molecules?

The balanced reaction: 4 Fe(s)+ 3 O₂(g) $\rightarrow$ 2 Fe₂O₃(s)is an oxidation-reduction reaction.

The reaction: Mg(s)+ 2 HBr(aq) $\rightarrow$ MgBr₂(s)+ H₂(g)is an oxidation-reduction reaction.

In the reaction: Ni²⁺(aq)+ Mg(s) $\rightarrow$ Ni(s)+ Mg²⁺(aq), the oxidizing agent is Ni²⁺(aq).

The mass of one ethanol (C₂H₆O)molecule is 7.65 × 10^-23 grams.