Question 1

The formula for sodium carbonate, Na2CO3
,represents a compound composed of

Accepted Answer

A) two atoms of sodium,three atoms of carbon,and three atoms of oxygen. 
B) two atoms of sodium,one atom of carbon,and three atoms of oxygen. 
C) six atoms of sodium,two atoms of carbon,and six atoms of oxygen. 
D) one atom of sodium and one atom of carbonate. 
E) two atoms of sodium and three atoms of carbonate. 
A) two atoms of sodium,three atoms of carbon,and three atoms of oxygen. 
B) two atoms of sodium,one atom of carbon,and three atoms of oxygen. 
C) six atoms of sodium,two atoms of carbon,and six atoms of oxygen. 
D) one atom of sodium and one atom of carbonate. 
E) two atoms of sodium and three atoms of carbonate.

Question 2

When the prefix milli is used in the metric or SI system,a fundamental unit of measurement is multiplied by what factor?

Accepted Answer

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

Question 3

How many significant figures should be retained in the result of the following calculation?

Accepted Answer

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

Question 4

A gas at 25°C exactly fills a container previously determined to have a volume of 1.05 × 103 cm3.The container plus gas are weighed and found to have a mass of 837.6 g.The container,when emptied of all gas,has a mass of 836.2 g.What is the density of the gas at 25°C?

Accepted Answer

Question 5

The numerical value for (5.6 × 104)÷ (7.89 × 102)is equal to,with the proper number of significant figures:

Accepted Answer

A) 70.976 
B) 71 
C) 7.098 × 101 
D) 71.0 
E) 70.98 
A) 70.976 
B) 71 
C) 7.098 × 101 
D) 71.0 
E) 70.98

Question 6

What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures.

Accepted Answer

A) 128   
B) 1280   
C) 1282.3   
D) 1282.32   
E) 1282.319   
A) 128   
B) 1280   
C) 1282.3   
D) 1282.32   
E) 1282.319

Question 7

Which statement describes a physical change?

Accepted Answer

A) winding an alarm clock 
B) turning on a flashlight 
C) digesting your lunch 
D) burning the morning toast 
E) lighting a match 
A) winding an alarm clock 
B) turning on a flashlight 
C) digesting your lunch 
D) burning the morning toast 
E) lighting a match

Question 8

Which element is not essential for human life?

Accepted Answer

A) C 
B) H 
C) P 
D) Pb 
E) Ca 
A) C 
B) H 
C) P 
D) Pb 
E) Ca

Question 9

How many inches are contained in 25.4 cm?

Accepted Answer

A) 100 inches 
B) 64.5 inches 
C) 25.4 inches 
D) 10.0 inches 
E) 0.10 inches 
A) 100 inches 
B) 64.5 inches 
C) 25.4 inches 
D) 10.0 inches 
E) 0.10 inches

Question 10

A student weighed a solid sample.The units for this measurement are most likely to be recorded as

Accepted Answer

A) grams. 
B) grams per cubic centimeter. 
C) Kelvins. 
D) liters. 
E) meters. 
A) grams. 
B) grams per cubic centimeter. 
C) Kelvins. 
D) liters. 
E) meters.

Question 11

What is the chemical symbol for calcium?

Accepted Answer

A) C 
B) Ca 
C) Cl 
D) Cr 
E) Cu 
A) C 
B) Ca 
C) Cl 
D) Cr 
E) Cu

Question 12

How many pounds are contained in 84.0 kg?

Accepted Answer

A) 0.038 lb 
B) 0.084 lb 
C) 38.0 lb 
D) 185 lb 
E) 380 lb 
A) 0.038 lb 
B) 0.084 lb 
C) 38.0 lb 
D) 185 lb 
E) 380 lb

Question 13

Explain how density can be used to determine the volume of carbon tetrachloride (which is a liquid at room temperature)needed to make a mixture using 37.2 of carbon tetrachloride.

Accepted Answer

Notice that the student is not asked to

Question 14

What is the specific gravity of a liquid sample with a mass of 35.0 g and a volume of 14.00 mL?

Accepted Answer

A) 14.0 g/mL 
B) 2.50 g/mL 
C) 21.0 
D) 14.0 
E) 2.50 
A) 14.0 g/mL 
B) 2.50 g/mL 
C) 21.0 
D) 14.0 
E) 2.50

Question 15

Which measurement represents the smallest quantity?

Accepted Answer

A) 2950 ng 
B) 2.95 × 10-4 g 
C) 2.95 × 103 μg 
D) 2.95 × 10-6 kg 
E) 29.5 mg 
A) 2950 ng 
B) 2.95 × 10-4 g 
C) 2.95 × 103 μg 
D) 2.95 × 10-6 kg 
E) 29.5 mg

Question 16

Consider the chemical reaction described as
Mercury(II)oxide  Mercury + oxygen.
Identify the reactant(s)in this example.

Accepted Answer

A) heat 
B) mercury + oxygen 
C) mercury(II)oxide 
D) mercury 
E) oxygen 
A) heat 
B) mercury + oxygen 
C) mercury(II)oxide 
D) mercury 
E) oxygen

Question 17

Which of the following is a physical change?

Accepted Answer

A) the rusting of iron 
B) the condensation of water vapor 
C) the baking of a potato 
D) the explosion of nitroglycerin 
E) all of the above 
A) the rusting of iron 
B) the condensation of water vapor 
C) the baking of a potato 
D) the explosion of nitroglycerin 
E) all of the above

Question 18

How many centimeters are contained in 12.5 inches?

Accepted Answer

A) 4.92 cm 
B) 5.10 cm 
C) 31.8 cm 
D) 492 cm 
E) None of the above. 
A) 4.92 cm 
B) 5.10 cm 
C) 31.8 cm 
D) 492 cm 
E) None of the above.

Question 19

The number 5.320 ×  
In conventional notation is

Accepted Answer

A) 532.0. 
B) 53.20. 
C) 5.320. 
D) 0.5320. 
E) 0.005320. 
A) 532.0. 
B) 53.20. 
C) 5.320. 
D) 0.5320. 
E) 0.005320.

Question 20

1-butanethiol,one of the compounds giving skunks their distinctive odor,freezes at -115.7°C and boils at 98.5°C.What is its phase at 37°C,the normal body temperature of humans?

Accepted Answer

A) solid 
B) liquid 
C) gas 
D) a mixture of solid and liquid 
E) a mixture of liquid and gas 
A) solid 
B) liquid 
C) gas 
D) a mixture of solid and liquid 
E) a mixture of liquid and gas

Exam 1: Matter and Measurements

The formula for sodium carbonate, Na2CO3 ,represents a compound composed of

When the prefix milli is used in the metric or SI system,a fundamental unit of measurement is multiplied by what factor?

How many significant figures should be retained in the result of the following calculation?

A gas at 25°C exactly fills a container previously determined to have a volume of 1.05 × 103 cm3.The container plus gas are weighed and found to have a mass of 837.6 g.The container,when emptied of all gas,has a mass of 836.2 g.What is the density of the gas at 25°C?

The numerical value for (5.6 × 104)÷ (7.89 × 102)is equal to,with the proper number of significant figures:

What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures.

Which statement describes a physical change?

Which element is not essential for human life?

How many inches are contained in 25.4 cm?

A student weighed a solid sample.The units for this measurement are most likely to be recorded as

What is the chemical symbol for calcium?

How many pounds are contained in 84.0 kg?

Explain how density can be used to determine the volume of carbon tetrachloride (which is a liquid at room temperature)needed to make a mixture using 37.2 of carbon tetrachloride.

What is the specific gravity of a liquid sample with a mass of 35.0 g and a volume of 14.00 mL?

Which measurement represents the smallest quantity?

Consider the chemical reaction described as Mercury(II)oxide Mercury + oxygen. Identify the reactant(s)in this example.

Which of the following is a physical change?

How many centimeters are contained in 12.5 inches?

The number 5.320 × In conventional notation is

1-butanethiol,one of the compounds giving skunks their distinctive odor,freezes at -115.7°C and boils at 98.5°C.What is its phase at 37°C,the normal body temperature of humans?

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

The formula for sodium carbonate, Na₂CO₃ ,represents a compound composed of

A gas at 25°C exactly fills a container previously determined to have a volume of 1.05 × 10³ cm³.The container plus gas are weighed and found to have a mass of 837.6 g.The container,when emptied of all gas,has a mass of 836.2 g.What is the density of the gas at 25°C?

The numerical value for (5.6 × 10⁴)÷ (7.89 × 10²)is equal to,with the proper number of significant figures: