Question 1

Radio waves travel at the speed of light, which is 3.00 × 108 m/s.How many kilometers will radio messages travel in exactly one year?

Accepted Answer

A) 9.46 × 1015 km 
B) 7.30 × 108 km 
C) 7.10 × 1010 km 
D) 9.46 × 1012 km 
E) 3.33 × 10-3 km 
A) 9.46 × 1015 km 
B) 7.30 × 108 km 
C) 7.10 × 1010 km 
D) 9.46 × 1012 km 
E) 3.33 × 10-3 km

Question 2

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm3?

Accepted Answer

A) 0.53 cm3 
B) 1.9 cm3 
C) 2.5 cm3 
D) 4.75 cm3 
E) 11.9 cm3 
A) 0.53 cm3 
B) 1.9 cm3 
C) 2.5 cm3 
D) 4.75 cm3 
E) 11.9 cm3

Question 3

A block of iron has a mass of 483 g.What is the mass of a block of graphite 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) 110 g 
B) 2120 g 
C) 6870 g 
D) 34 g 
E) none of them are within 10 g of the right answer. 
A) 110 g 
B) 2120 g 
C) 6870 g 
D) 34 g 
E) none of them are within 10 g of the right answer.

Question 4

A pure yellow crystalline substance, when heated in a vacuum, releases a greenish gas and a red powder.Is the original yellow crystalline substance a compound or element?

Accepted Answer

The answer of A pure yellow crystalline substance, when heated...

Question 5

Identify the following as a physical or chemical change: Fermenting grapes.

Accepted Answer

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

Question 6

Express the number 0.000053 in scientific notation.

Accepted Answer

A) 5.3 × 10-2 
B) 5.3 × 10-3 
C) 5.3 × 10-4 
D) 5.3 × 10-5 
E) 5.3 × 10-6 
A) 5.3 × 10-2 
B) 5.3 × 10-3 
C) 5.3 × 10-4 
D) 5.3 × 10-5 
E) 5.3 × 10-6

Question 7

Which of the following represents the largest mass?

Accepted Answer

A) 2.0 × 102 mg 
B) 0.0010 kg 
C) 1.0 × 105 ng 
D) 2.0 × 102 cg 
E) 10.0 dg 
A) 2.0 × 102 mg 
B) 0.0010 kg 
C) 1.0 × 105 ng 
D) 2.0 × 102 cg 
E) 10.0 dg

Question 8

Choose the response that includes all the items listed below that are pure substances. i.orange juice ii.steam iii.ocean water iv.oxygen v.vegetable soup

Accepted Answer

A) i, iii, v 
B) ii, iv 
C) i, iii, iv 
D) iv only 
E) all of them are pure 
A) i, iii, v 
B) ii, iv 
C) i, iii, iv 
D) iv only 
E) all of them are pure

Question 9

Give the correct number of significant figures and units to the problem below 58.00 mg - 45.22 µg =

Accepted Answer

A) 57.95 mg 
B) 12.78 mg 
C) 12.78 µg 
D) 57.55 µg 
E) 12.78 mg2 
A) 57.95 mg 
B) 12.78 mg 
C) 12.78 µg 
D) 57.55 µg 
E) 12.78 mg2

Question 10

Which of the following does not represent a chemical change?

Accepted Answer

A) a freshly cut apple turns brown 
B) milk turns sour on standing at room temperature 
C) when cooled to 0°C, liquid water becomes ice 
D) frying an egg 
E) fermentation of sugar to alcohol 
A) a freshly cut apple turns brown 
B) milk turns sour on standing at room temperature 
C) when cooled to 0°C, liquid water becomes ice 
D) frying an egg 
E) fermentation of sugar to alcohol

Question 11

What is the lowest temperature that can be attained in units of °C (use 3 significant figures)?

Accepted Answer

The answer of What is the lowest temperature that can...

Question 12

A soft drink costs 75 cents for a 12-oz can.A two-liter bottle costs $1.25.In which form is the soft drink more expensive? How much more expensive? (1.0 L = 1.057 qt, 1 qt = 32 oz)

Accepted Answer

The two-liter bottle

Question 13

Many home freezers maintain a temperature of 0°F.Express this temperature in °C.

Accepted Answer

A) -32°C 
B) -18°C 
C) 0°C 
D) 18°C 
E) 57.6°C 
A) -32°C 
B) -18°C 
C) 0°C 
D) 18°C 
E) 57.6°C

Question 14

Complete the following sentence.A theory is

Accepted Answer

A) a tentative explanation for a set of observations that can be tested by further experimentation. 
B) a statement describing a relationship between phenomena that is always the same under the same conditions. 
C) a unifying principle that explains a body of facts and relations. 
D) a model used to visualize the invisible. 
A) a tentative explanation for a set of observations that can be tested by further experimentation. 
B) a statement describing a relationship between phenomena that is always the same under the same conditions. 
C) a unifying principle that explains a body of facts and relations. 
D) a model used to visualize the invisible.

Question 15

A spherical vessel (diameter = 5.00 cm)when empty has a mass of 12.00 g.What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of benzene? (Given: density of water = 1.00 g/cm3; density of benzene = 0.879 g/cm3)

Accepted Answer

A) 45.5 mL 
B) 448 mL 
C) 53.4 mL 
D) 57.5 mL 
E) 65.4 mL 
A) 45.5 mL 
B) 448 mL 
C) 53.4 mL 
D) 57.5 mL 
E) 65.4 mL

Question 16

What is the mass of 1.00 dm3 of mercury? The density of mercury is 13.6 g/cm3.

Accepted Answer

Question 17

Define element.

Accepted Answer

An element is a subs

Question 18

Classify the following as an intensive or an extensive property: Cost per unit

Accepted Answer

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

Question 19

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 × 104 miles per hour.What is this speed in m/s? (1 mile = 1609 m)

Accepted Answer

A) 4.2 × 10-3 m/s 
B) 6.9 m/s 
C) 4.2 × 102 m/s 
D) 1.1 × 104 m/s 
E) 4.0 × 107 m/s 
A) 4.2 × 10-3 m/s 
B) 6.9 m/s 
C) 4.2 × 102 m/s 
D) 1.1 × 104 m/s 
E) 4.0 × 107 m/s

Question 20

All of the following are properties of tin.Which one is a chemical property of tin?

Accepted Answer

A) Tin can be hammered into a thin sheet. 
B) At -40°C a sheet of tin crumbles to a gray powder. 
C) Tin melts at 231.9°C. 
D) When a bar of tin is bent, it emits an audible "cry". 
E) Tin erodes when added to hydrochloric acid, and a clear gas forms. 
A) Tin can be hammered into a thin sheet. 
B) At -40°C a sheet of tin crumbles to a gray powder. 
C) Tin melts at 231.9°C. 
D) When a bar of tin is bent, it emits an audible "cry". 
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.

Exam 1: Chemistry: the Study of Change

Radio waves travel at the speed of light, which is 3.00 × 108 m/s.How many kilometers will radio messages travel in exactly one year?

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm3?

A block of iron has a mass of 483 g.What is the mass of a block of graphite 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.

A pure yellow crystalline substance, when heated in a vacuum, releases a greenish gas and a red powder.Is the original yellow crystalline substance a compound or element?

Identify the following as a physical or chemical change: Fermenting grapes.

Express the number 0.000053 in scientific notation.

Which of the following represents the largest mass?

Choose the response that includes all the items listed below that are pure substances. i.orange juice ii.steam iii.ocean water iv.oxygen v.vegetable soup

Give the correct number of significant figures and units to the problem below 58.00 mg - 45.22 µg =

Which of the following does not represent a chemical change?

What is the lowest temperature that can be attained in units of °C (use 3 significant figures)?

A soft drink costs 75 cents for a 12-oz can.A two-liter bottle costs $1.25.In which form is the soft drink more expensive? How much more expensive? (1.0 L = 1.057 qt, 1 qt = 32 oz)

Many home freezers maintain a temperature of 0°F.Express this temperature in °C.

Complete the following sentence.A theory is

A spherical vessel (diameter = 5.00 cm)when empty has a mass of 12.00 g.What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of benzene? (Given: density of water = 1.00 g/cm3; density of benzene = 0.879 g/cm3)

What is the mass of 1.00 dm3 of mercury? The density of mercury is 13.6 g/cm3.

Define element.

Classify the following as an intensive or an extensive property: Cost per unit

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 × 104 miles per hour.What is this speed in m/s? (1 mile = 1609 m)

All of the following are properties of tin.Which one is a chemical property of tin?

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

Radio waves travel at the speed of light, which is 3.00 × 10⁸ m/s.How many kilometers will radio messages travel in exactly one year?

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm³?

A block of iron has a mass of 483 g.What is the mass of a block of graphite 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.

A spherical vessel (diameter = 5.00 cm)when empty has a mass of 12.00 g.What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of benzene? (Given: density of water = 1.00 g/cm³; density of benzene = 0.879 g/cm³)

What is the mass of 1.00 dm³ of mercury? The density of mercury is 13.6 g/cm³.

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 × 10⁴ miles per hour.What is this speed in m/s? (1 mile = 1609 m)