Question 1

Calculate the mass of the air contained in a room that measures 2.50 m × 5.50 m × 3.00 m (density of air = 1.29 g/dm3 at 25°C).

Accepted Answer

A) 3.13 × 10 -5 g 
B) 32.0 kg 
C) 53.2 kg 
D) 53.2 g 
E) None of the above. 
A) 3.13 × 10 -5 g 
B) 32.0 kg 
C) 53.2 kg 
D) 53.2 g 
E) None of the above.

Question 2

All of the following are properties of sodium.Which one is a physical property of sodium?

Accepted Answer

A) It's surface turns black when first exposed to air. 
B) It is a solid at 25°C and changes to a liquid when heated to 98°C. 
C) When placed in water it sizzles and a gas is formed. 
D) When placed in contact with chlorine it forms a compound that melts at 801°C. 
E) Sodium is never found as the pure metal in nature. 
A) It's surface turns black when first exposed to air. 
B) It is a solid at 25°C and changes to a liquid when heated to 98°C. 
C) When placed in water it sizzles and a gas is formed. 
D) When placed in contact with chlorine it forms a compound that melts at 801°C. 
E) Sodium is never found as the pure metal in nature.

Question 3

The element gallium melts at 29.8°C.What temperature is this in °F?

Accepted Answer

A) -54.1°F 
B) -7.8°F 
C) +13.5°F 
D) +51.3°F 
E) +85.6°F 
A) -54.1°F 
B) -7.8°F 
C) +13.5°F 
D) +51.3°F 
E) +85.6°F

Question 4

A block of iron has a mass of 826 g.What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25°C are provided: magnesium, 1.7 g/cm3 ; graphite, 1.8 g/cm3 ; iron, 7.9 g/cm3.

Accepted Answer

A) 1,400 g 
B) 3,800 g 
C) 830 g 
D) 180 g 
E) none of them are within 10 g of the right answer. 
A) 1,400 g 
B) 3,800 g 
C) 830 g 
D) 180 g 
E) none of them are within 10 g of the right answer.

Question 5

Classify the following as a mixture, a compound, or an element: Sugar to put in a cup of coffee.

Accepted Answer

The answer of Classify the following as a mixture, a...

Question 6

Identify the following as a physical or chemical change: Fashioning a table leg from a piece of wood.

Accepted Answer

The answer of Identify the following as a physical or...

Question 7

An organic liquid has a density of 1.2 g/cm3.What is the mass of a 35.0 cm3 sample of this liquid?

Accepted Answer

Question 8

Classify the following as an intensive or an extensive property: Density

Accepted Answer

The answer of Classify the following as an intensive or...

Question 9

Classify the following as a mixture, a compound, or an element: Brewed coffee, ready to drink.

Accepted Answer

The answer of Classify the following as a mixture, a...

Question 10

How many significant figures are there in 0.3070 g?

Accepted Answer

A) 6 
B) 5 
C) 4 
D) 3 
E) 2 
A) 6 
B) 5 
C) 4 
D) 3 
E) 2

Question 11

The SI prefixes mega and deci represent, respectively:

Accepted Answer

A) 103 and 10-2. 
B) 106 and 10-1. 
C) 10-3 and 10-2. 
D) 10-6 and 102. 
E) 102 and 10-3. 
A) 103 and 10-2. 
B) 106 and 10-1. 
C) 10-3 and 10-2. 
D) 10-6 and 102. 
E) 102 and 10-3.

Question 12

A runner averages 8 minutes and 25 seconds per mile.What is her average velocity in miles per hour?

Accepted Answer

A) 7.27 mi/hr 
B) 7.13 mi/hr 
C) 8.42 mi/hr 
D) 4.36 mi/hr 
E) 0.140 mi/hr 
A) 7.27 mi/hr 
B) 7.13 mi/hr 
C) 8.42 mi/hr 
D) 4.36 mi/hr 
E) 0.140 mi/hr

Question 13

Iron has a density of 7.86 g/cm3.The volume occupied by 55.85 g of iron is

Accepted Answer

A) 0.141 cm3 
B) 7.11 cm3 
C) 2.8 cm3 
D) 439 cm3 
E) None of the above. 
A) 0.141 cm3 
B) 7.11 cm3 
C) 2.8 cm3 
D) 439 cm3 
E) None of the above.

Question 14

Give the correct number of significant figures and units to the problem below 4.5 m / 8.52 m =

Accepted Answer

A) 0.528 m 
B) 0.53 m 
C) 0.53 m2 
D) 0.53 
E) 0.528 m2 
A) 0.528 m 
B) 0.53 m 
C) 0.53 m2 
D) 0.53 
E) 0.528 m2

Question 15

Radio waves travel at the speed of light, which is 3.00 × 108 m/s.How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 × 108 km from Earth?

Accepted Answer

A) 4.4 × 10-2 min 
B) 1.6 × 105 min 
C) 4.0 × 1015 min 
D) 44 min 
E) 2.6 min 
A) 4.4 × 10-2 min 
B) 1.6 × 105 min 
C) 4.0 × 1015 min 
D) 44 min 
E) 2.6 min

Question 16

Classify the following as an intensive or an extensive property: Total cost

Accepted Answer

The answer of Classify the following as an intensive or...

Question 17

Classify the following as a pure substance or a mixture: Bread.

Accepted Answer

The answer of Classify the following as a pure substance...

Question 18

Give the correct number of significant figures and units to the problem below (3.45 m + 2.78 m)/ 565 s =

Accepted Answer

A) 1.10 x 10-2 m2/s 
B) 1.10 x 10-2 m/s 
C) 1.10 x 10-2 s-1 
D) 1.10 x 10-2 s 
E) 1.10 x 10-2 m2 
A) 1.10 x 10-2 m2/s 
B) 1.10 x 10-2 m/s 
C) 1.10 x 10-2 s-1 
D) 1.10 x 10-2 s 
E) 1.10 x 10-2 m2

Question 19

Americans combined drive about 4.0×109 miles per day and their vehicles get an average of 20 miles per gallon of fuel used.For each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced.How many kilograms of CO2 are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.

Accepted Answer

A) 2.1 × 109 kg 
B) 8.4 × 1011 kg 
C) 1.7 × 108 kg 
D) 93 kg 
E) none of these 
A) 2.1 × 109 kg 
B) 8.4 × 1011 kg 
C) 1.7 × 108 kg 
D) 93 kg 
E) none of these

Question 20

A cyclist averages 18.5 miles per hour.How many minutes will it take for him to complete a 125 kilometer race?

Accepted Answer

A) 252 min 
B) 652 min 
C) 420 min 
D) 1440 min 
E) 405 min 
A) 252 min 
B) 652 min 
C) 420 min 
D) 1440 min 
E) 405 min

Exam 1: Chemistry: the Study of Change

Calculate the mass of the air contained in a room that measures 2.50 m × 5.50 m × 3.00 m (density of air = 1.29 g/dm3 at 25°C).

All of the following are properties of sodium.Which one is a physical property of sodium?

The element gallium melts at 29.8°C.What temperature is this in °F?

A block of iron has a mass of 826 g.What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25°C are provided: magnesium, 1.7 g/cm3 ; graphite, 1.8 g/cm3 ; iron, 7.9 g/cm3.

Classify the following as a mixture, a compound, or an element: Sugar to put in a cup of coffee.

Identify the following as a physical or chemical change: Fashioning a table leg from a piece of wood.

An organic liquid has a density of 1.2 g/cm3.What is the mass of a 35.0 cm3 sample of this liquid?

Classify the following as an intensive or an extensive property: Density

Classify the following as a mixture, a compound, or an element: Brewed coffee, ready to drink.

How many significant figures are there in 0.3070 g?

The SI prefixes mega and deci represent, respectively:

A runner averages 8 minutes and 25 seconds per mile.What is her average velocity in miles per hour?

Iron has a density of 7.86 g/cm3.The volume occupied by 55.85 g of iron is

Give the correct number of significant figures and units to the problem below 4.5 m / 8.52 m =

Radio waves travel at the speed of light, which is 3.00 × 108 m/s.How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 × 108 km from Earth?

Classify the following as an intensive or an extensive property: Total cost

Classify the following as a pure substance or a mixture: Bread.

Give the correct number of significant figures and units to the problem below (3.45 m + 2.78 m)/ 565 s =

A cyclist averages 18.5 miles per hour.How many minutes will it take for him to complete a 125 kilometer race?

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Calculate the mass of the air contained in a room that measures 2.50 m × 5.50 m × 3.00 m (density of air = 1.29 g/dm³ at 25°C).

A block of iron has a mass of 826 g.What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25°C are provided: magnesium, 1.7 g/cm³; graphite, 1.8 g/cm³; iron, 7.9 g/cm³.

An organic liquid has a density of 1.2 g/cm³.What is the mass of a 35.0 cm³ sample of this liquid?

Iron has a density of 7.86 g/cm³.The volume occupied by 55.85 g of iron is

Radio waves travel at the speed of light, which is 3.00 × 10⁸ m/s.How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 × 10⁸ km from Earth?