Question 1

Which of the following is a mixture?

Accepted Answer

A) cough syrup 
B) iron 
C) helium 
D) sodium hydrogen carbonate 
E) steam 
A) cough syrup 
B) iron 
C) helium 
D) sodium hydrogen carbonate 
E) steam

Question 2

A pure substance

Accepted Answer

A) always has the same elemental composition. 
B) is composed of more than one element. 
C) can be broken into its components by physical means. 
D) is chemically inert. 
E) changes color when placed in bright sunlight. 
A) always has the same elemental composition. 
B) is composed of more than one element. 
C) can be broken into its components by physical means. 
D) is chemically inert. 
E) changes color when placed in bright sunlight.

Question 3

What is the total length of two pieces of rubber tubing which are 7.69 cm and 4.028 cm in length? Express this answer to the correct number of significant figures.

Accepted Answer

A) 11.7 cm 
B) 11.69 cm 
C) 11.718 cm 
D) 11.72 cm 
E) 12 cm 
A) 11.7 cm 
B) 11.69 cm 
C) 11.718 cm 
D) 11.72 cm 
E) 12 cm

Question 4

A chemist is given an unknown sample.Which of her observations is not a physical property?

Accepted Answer

A) The sample is a colorless liquid. 
B) The sample has an odor similar to gasoline. 
C) The sample is flammable. 
D) The sample size is 55 mL. 
E) The density of the liquid is 0.789 g/mL. 
A) The sample is a colorless liquid. 
B) The sample has an odor similar to gasoline. 
C) The sample is flammable. 
D) The sample size is 55 mL. 
E) The density of the liquid is 0.789 g/mL.

Question 5

An analysis showed a sample to contain 0.00471 grams of lead.How many micrograms is this?

Accepted Answer

A) 0.471 μg 
B) 4.71 ×  μg 
C) 4.71 ×  μg 
D) 4.71 ×  μg 
E) 4.71 ×  μg 
A) 0.471 μg 
B) 4.71 ×  μg 
C) 4.71 ×  μg 
D) 4.71 ×  μg 
E) 4.71 ×  μg

Question 6

If an automobile gets 24.5 miles to the gallon and the cost of gasoline is $2.75 a gallon,how much will it cost to drive 975 km?

Accepted Answer

The answer of If an automobile gets 24.5 miles to...

Question 7

How many calories are released when 500 g of water cools from 95.0°C to 25.0°C?

Accepted Answer

A) 35.0 cal 
B) 70.0 cal 
C) 1.25 ×  
Cal 
D) 3.50 ×  
Cal 
E) 4.75 ×  
Cal 
A) 35.0 cal 
B) 70.0 cal 
C) 1.25 ×  
Cal 
D) 3.50 ×  
Cal 
E) 4.75 ×  
Cal

Question 8

If 55.0 g of olive oil has 877 cal of heat added to it at a room temperature of 26.0°C,what will be the final temperature of the olive oil? The specific heat of olive oil is 2.19 cal/g°C.

Accepted Answer

A) 33.3°C 
B) 7.3°C 
C) 19.0°C 
D) 26.0°C 
E) 3.3 °C 
A) 33.3°C 
B) 7.3°C 
C) 19.0°C 
D) 26.0°C 
E) 3.3 °C

Question 9

The formula for ammonia,  
,represents a compound composed of

Accepted Answer

A) one atom of nickel and three atoms of hydrogen. 
B) one atom of nitrogen and three atoms of hydrogen. 
C) three atoms of nitrogen and three atoms of hydrogen. 
D) three atoms of nitrogen and one atom of hydrogen. 
E) one atom of nitrogen and three atoms of helium. 
A) one atom of nickel and three atoms of hydrogen. 
B) one atom of nitrogen and three atoms of hydrogen. 
C) three atoms of nitrogen and three atoms of hydrogen. 
D) three atoms of nitrogen and one atom of hydrogen. 
E) one atom of nitrogen and three atoms of helium.

Question 10

Of the elements listed,the most abundant by mass percent in the earth's crust is

Accepted Answer

A) silicon. 
B) aluminum. 
C) hydrogen. 
D) iron. 
E) sodium. 
A) silicon. 
B) aluminum. 
C) hydrogen. 
D) iron. 
E) sodium.

Question 11

How many grams are contained in 1.20 pounds?

Accepted Answer

A) 545 g 
B) 378 g 
C) 264 g 
D) 2.2 g 
E) 1.20 g 
A) 545 g 
B) 378 g 
C) 264 g 
D) 2.2 g 
E) 1.20 g

Question 12

Malic acid,a compound used to increase the acidity of fruit-flavored products,freezes at 128°C and boils at 150°C.What is its phase at 100°C,a temperature used in food processing applications?

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

Question 13

Which of the following numbers contains four significant figures?

Accepted Answer

A) 230,110 
B) 23,011.0 
C) 0.23010 
D) 0.0230100 
E) 0.002301 
A) 230,110 
B) 23,011.0 
C) 0.23010 
D) 0.0230100 
E) 0.002301

Question 14

The formula for glucose,C6H12O6,represents a compound composed of

Accepted Answer

A) six atoms of carbon,twelve atoms of hydrogen,and six atoms of oxygen. 
B) six atoms of carbon,ten atoms of hydrogen,and four atoms of oxygen. 
C) one atom of carbon,two atoms of hydrogen,and one atom of oxygen. 
D) six atoms of carbon and six atoms of water. 
E) six atoms of carbon and two atoms of water. 
A) six atoms of carbon,twelve atoms of hydrogen,and six atoms of oxygen. 
B) six atoms of carbon,ten atoms of hydrogen,and four atoms of oxygen. 
C) one atom of carbon,two atoms of hydrogen,and one atom of oxygen. 
D) six atoms of carbon and six atoms of water. 
E) six atoms of carbon and two atoms of water.

Question 15

What is the chemical symbol for chlorine?

Accepted Answer

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

Question 16

How many quarts are contained in 450.mL?

Accepted Answer

A) 0.426 quart 
B) 2.10 quarts 
C) 426 quarts 
D) 475 quarts 
E) 0.475 quarts 
A) 0.426 quart 
B) 2.10 quarts 
C) 426 quarts 
D) 475 quarts 
E) 0.475 quarts

Question 17

Which of the following statements is true of specific gravity?

Accepted Answer

A) It has the units of g/cm3. 
B) Specific gravity is constant at any temperature. 
C) Specific gravity is unitless because it is the density of one substance divided by the density of water. 
D) Specific gravity is a measure of the reactivity index of a substance. 
A) It has the units of g/cm3. 
B) Specific gravity is constant at any temperature. 
C) Specific gravity is unitless because it is the density of one substance divided by the density of water. 
D) Specific gravity is a measure of the reactivity index of a substance.

Question 18

Why is the number 32 (and not some other value)used in the formula for converting between Celsius and Fahrenheit temperatures?

Accepted Answer

The 32 compensates for the fac

Question 19

The metric unit used to measure volume is the

Accepted Answer

A) gram. 
B) gram per cubic centimeter. 
C) Kelvin. 
D) liter. 
E) meter. 
A) gram. 
B) gram per cubic centimeter. 
C) Kelvin. 
D) liter. 
E) meter.

Question 20

Which of the following numbers contains five significant figures?

Accepted Answer

A) 0.04910 
B) 0.4910 
C) 4.9100 
D) 49,100 
E) 4,910,000 
A) 0.04910 
B) 0.4910 
C) 4.9100 
D) 49,100 
E) 4,910,000

Exam 1: Matter and Measurements

Which of the following is a mixture?

A pure substance

What is the total length of two pieces of rubber tubing which are 7.69 cm and 4.028 cm in length? Express this answer to the correct number of significant figures.

A chemist is given an unknown sample.Which of her observations is not a physical property?

An analysis showed a sample to contain 0.00471 grams of lead.How many micrograms is this?

If an automobile gets 24.5 miles to the gallon and the cost of gasoline is $2.75 a gallon,how much will it cost to drive 975 km?

How many calories are released when 500 g of water cools from 95.0°C to 25.0°C?

If 55.0 g of olive oil has 877 cal of heat added to it at a room temperature of 26.0°C,what will be the final temperature of the olive oil? The specific heat of olive oil is 2.19 cal/g°C.

The formula for ammonia, ,represents a compound composed of

Of the elements listed,the most abundant by mass percent in the earth's crust is

How many grams are contained in 1.20 pounds?

Malic acid,a compound used to increase the acidity of fruit-flavored products,freezes at 128°C and boils at 150°C.What is its phase at 100°C,a temperature used in food processing applications?

Which of the following numbers contains four significant figures?

The formula for glucose,C6H12O6,represents a compound composed of

What is the chemical symbol for chlorine?

How many quarts are contained in 450.mL?

Which of the following statements is true of specific gravity?

Why is the number 32 (and not some other value)used in the formula for converting between Celsius and Fahrenheit temperatures?

The metric unit used to measure volume is the

Which of the following numbers contains five significant figures?

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 glucose,C₆H₁₂O₆,represents a compound composed of