Question 1

The atomic weight of copper is greater than that of chromium. Which of the following statements is true provided you have a 10-g sample of each of these metals?

Accepted Answer

A)  You have fewer atoms of copper than of chromium. 
B)  You have an equal number of copper and chromium atoms. 
C)  You have more atoms of copper than of chromium. 
D)  There is insufficient information to determine which statement is true. 
A)  You have fewer atoms of copper than of chromium. 
B)  You have an equal number of copper and chromium atoms. 
C)  You have more atoms of copper than of chromium. 
D)  There is insufficient information to determine which statement is true.

Question 2

0.117 mol of a particular substance weighs 21.9 g. What is the molar mass of this substance?

Accepted Answer

A)  187 g 
B)  187 amu 
C)  0.00534 g 
D)  0.00534 amu 
A)  187 g 
B)  187 amu 
C)  0.00534 g 
D)  0.00534 amu

Question 3

The atomic weight of copper is less than that of silver. Which of the following statements is true provided you have a 10-g sample of each of these metals?

Accepted Answer

A)  You have fewer atoms of copper than of silver. 
B)  You have an equal number of copper and silver atoms. 
C)  You have more atoms of copper than of silver. 
D)  There is insufficient information to determine which statement is true. 
A)  You have fewer atoms of copper than of silver. 
B)  You have an equal number of copper and silver atoms. 
C)  You have more atoms of copper than of silver. 
D)  There is insufficient information to determine which statement is true.

Question 4

Which of the following sulfides is soluble in water?

Accepted Answer

A)  Ag2S 
B)  FeS 
C)  K2S 
D)  PbS 
A)  Ag2S 
B)  FeS 
C)  K2S 
D)  PbS

Question 5

Consider the following representation of a voltaic cell.   This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq)
What is the identity of the "Metal" shown in the diagram?

Accepted Answer

A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+ 
A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+

Question 6

You have a sample of 1.204 × 1024 atoms of gold. How much does this sample weigh?

Accepted Answer

A)  2.000 g 
B)  98.5 g 
C)  197.0 g 
D)  394.0 g 
A)  2.000 g 
B)  98.5 g 
C)  197.0 g 
D)  394.0 g

Question 7

How many hydrogen atoms are there in 2.50 mol of C6H12O6?

Accepted Answer

A)  2.50 
B)  12.0 
C)  1.51 × 1024 
D)  1.81 × 1025 
A)  2.50 
B)  12.0 
C)  1.51 × 1024 
D)  1.81 × 1025

Question 8

The temperature of an unknown substance weighing 500 grams rises by 30°C when 2,000 cal of heat is added to it. What is the specific heat of this substance?

Accepted Answer

A)  0.033 cal/g·°C 
B)  0.133 cal/g·°C 
C)  0.233 cal/g·°C 
D)  0.433 cal/g·°C 
A)  0.033 cal/g·°C 
B)  0.133 cal/g·°C 
C)  0.233 cal/g·°C 
D)  0.433 cal/g·°C

Question 9

Consider the following representation of a voltaic cell.   This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq)
What is the oxidizing agent in this reaction?

Accepted Answer

A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+ 
A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+

Question 10

The atomic weight of platinum is less than that of gold. Which of the following statements is true provided you have a 10-g sample of each of these metals?

Accepted Answer

A)  You have fewer atoms of platinum than of gold. 
B)  You have an equal number of platinum and gold atoms. 
C)  You have more atoms of platinum than of gold. 
D)  There is insufficient information to determine which statement is true. 
A)  You have fewer atoms of platinum than of gold. 
B)  You have an equal number of platinum and gold atoms. 
C)  You have more atoms of platinum than of gold. 
D)  There is insufficient information to determine which statement is true.

Question 11

Examine the reaction taking place in the beaker in the image.   Which of the following is most likely occurring in the beaker?

Accepted Answer

A)  a precipitate forming 
B)  a metal being oxidized 
C)  a metal being reduced 
D)  a salt dissolving 
A)  a precipitate forming 
B)  a metal being oxidized 
C)  a metal being reduced 
D)  a salt dissolving

Question 12

Which of the following is true of specific heat?

Accepted Answer

A)  Specific heat is a chemical property. 
B)  All substances have the same specific heat. 
C)  Specific heat is the amount of heat needed to change the state of 1 g of a substance from solid to liquid. 
D)  Specific heat is the amount of heat needed to raise the temperature of 1 g of a substance by 1°C. 
A)  Specific heat is a chemical property. 
B)  All substances have the same specific heat. 
C)  Specific heat is the amount of heat needed to change the state of 1 g of a substance from solid to liquid. 
D)  Specific heat is the amount of heat needed to raise the temperature of 1 g of a substance by 1°C.

Question 13

Which of the following ions always forms soluble compounds?

Accepted Answer

A)  Na+ 
B)  NH4+ 
C)  CH3COO- 
D)  all of these 
A)  Na+ 
B)  NH4+ 
C)  CH3COO- 
D)  all of these

Question 14

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l)
If water is present in excess, how many grams of ethanol can be produced from 42.7 g of ethylene?

Accepted Answer

A)  42.7 g 
B)  46.1 g 
C)  70.1 g 
D)  92.2 g 
A)  42.7 g 
B)  46.1 g 
C)  70.1 g 
D)  92.2 g

Question 15

If you need a sample of 2.84 mol of Na2S, then how many grams of Na2S do you need?

Accepted Answer

A)  0.00451 g 
B)  2.84 g 
C)  78.1 g 
D)  222 g 
A)  0.00451 g 
B)  2.84 g 
C)  78.1 g 
D)  222 g

Question 16

Which of the following compounds is soluble in water?

Accepted Answer

A)  AgCl 
B)  AgBr 
C)  AgI 
D)  AgC2H3O2 
A)  AgCl 
B)  AgBr 
C)  AgI 
D)  AgC2H3O2

Question 17

Which of the following is true of most bleaches?

Accepted Answer

A)  They are reducing agents. 
B)  They are oxidizing agents. 
C)  They are both reducing agents and oxidizing agents. 
D)  They are neither reducing agents nor oxidizing agents. 
A)  They are reducing agents. 
B)  They are oxidizing agents. 
C)  They are both reducing agents and oxidizing agents. 
D)  They are neither reducing agents nor oxidizing agents.

Question 18

What is the formula weight of ammonium carbonate, (NH4)2CO3?

Accepted Answer

A)  78.1 amu 
B)  96.1 amu 
C)  108.4 amu 
D)  138.2 amu 
A)  78.1 amu 
B)  96.1 amu 
C)  108.4 amu 
D)  138.2 amu

Exam 4: Chemical Reactions

The atomic weight of copper is greater than that of chromium. Which of the following statements is true provided you have a 10-g sample of each of these metals?

0.117 mol of a particular substance weighs 21.9 g. What is the molar mass of this substance?

The atomic weight of copper is less than that of silver. Which of the following statements is true provided you have a 10-g sample of each of these metals?

Which of the following sulfides is soluble in water?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) What is the identity of the "Metal" shown in the diagram?

You have a sample of 1.204 × 1024 atoms of gold. How much does this sample weigh?

How many hydrogen atoms are there in 2.50 mol of C6H12O6?

The temperature of an unknown substance weighing 500 grams rises by 30°C when 2,000 cal of heat is added to it. What is the specific heat of this substance?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) What is the oxidizing agent in this reaction?

The atomic weight of platinum is less than that of gold. Which of the following statements is true provided you have a 10-g sample of each of these metals?

Examine the reaction taking place in the beaker in the image. Which of the following is most likely occurring in the beaker?

Which of the following is true of specific heat?

Which of the following ions always forms soluble compounds?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l) If water is present in excess, how many grams of ethanol can be produced from 42.7 g of ethylene?

If you need a sample of 2.84 mol of Na2S, then how many grams of Na2S do you need?

Which of the following compounds is soluble in water?

Which of the following is true of most bleaches?

What is the formula weight of ammonium carbonate, (NH4)2CO3?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

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Filters

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu²⁺(aq) → Cu(s) + Mg²⁺(aq) What is the identity of the "Metal" shown in the diagram?

You have a sample of 1.204 × 10²⁴ atoms of gold. How much does this sample weigh?

How many hydrogen atoms are there in 2.50 mol of C₆H₁₂O₆?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu²⁺(aq) → Cu(s) + Mg²⁺(aq) What is the oxidizing agent in this reaction?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many grams of ethanol can be produced from 42.7 g of ethylene?

If you need a sample of 2.84 mol of Na₂S, then how many grams of Na₂S do you need?

What is the formula weight of ammonium carbonate, (NH₄)₂CO₃?