Question 1

Classify the following as an element, a compound, or a mixture: Air.

Accepted Answer

The answer of Classify the following as an element, a...

Question 2

The SI base unit of time is the hour.

Accepted Answer

A) True 
 B)False

Question 3

Give the correct number of significant figures and units to the problem below. 3.4 x 10-2 mg + 448 µg =

Accepted Answer

A) 0.48 mg 
B) 0.482 mg 
C) 4.5 mg 
D) 4.48 mg 
E) 4.5 x 102 mg 
A) 0.48 mg 
B) 0.482 mg 
C) 4.5 mg 
D) 4.48 mg 
E) 4.5 x 102 mg

Question 4

The highest temperature ever recorded in Phoenix, Arizona, was 122°F.Express this temperature in °C.

Accepted Answer

A) 50.0°C 
B) 64.4°C 
C) 67.8°C 
D) 162.0°C 
E) 219.6°C 
A) 50.0°C 
B) 64.4°C 
C) 67.8°C 
D) 162.0°C 
E) 219.6°C

Question 5

Complete the following sentence.A scientific law 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 6

How many significant figures does the number 0.07010 contain?

Accepted Answer

The answer of How many significant figures does the number...

Question 7

A special flask used in the determination of densities, called a pycnometer, has a mass of 16.3179 g when empty, and it has a mass of 48.0250 g when filled with water at 20.0°C.When this same pycnometer is filled with ethyl alcohol at 20.0°C, it is found to have a mass of 41.3934 g.Find the density of ethyl alcohol at 20.0°C. (Given: at 20.0°C, the density of water is 0.9982 g/mL)

Accepted Answer

A) 0.7894 g/mL 
B) 0.7923 g/mL 
C) 0.7908 g/mL 
D) 1.303 g/mL 
E) 0.7674 g/mL 
A) 0.7894 g/mL 
B) 0.7923 g/mL 
C) 0.7908 g/mL 
D) 1.303 g/mL 
E) 0.7674 g/mL

Question 8

Define mixture.

Accepted Answer

A mixture is a combination of

Question 9

An investor paid market price for a chunk of gold that he was told was pure.The gold bar had a mass of 440 g, but was slightly irregular so an exact volume could not be calculated.The investor filled a large graduated cylinder with water, immersed the chunk of gold, and observed an increase in the apparent volume of material in the graduated cylinder of 25.0 mL.Pure gold has a density of 19.3 g/cm3.Did the investor get his money's worth? Why or why not?

Accepted Answer

No.The investor's me

Question 10

The SI prefixes kilo and milli represent, respectively:

Accepted Answer

A) 10-9 and 10-6. 
B) 106 and 10-3. 
C) 103 and 10-3. 
D) 109 and 10-6. 
E) 10-9 and 10-1. 
A) 10-9 and 10-6. 
B) 106 and 10-3. 
C) 103 and 10-3. 
D) 109 and 10-6. 
E) 10-9 and 10-1.

Question 11

What is the volume, in cubic inches, of a brick that is 4.0 in × 2.7 in × 8.0 in?

Accepted Answer

A) 15 in3 
B) 51 in3 
C) 78 in3 
D) 87 in3 
E) 150 in3 
A) 15 in3 
B) 51 in3 
C) 78 in3 
D) 87 in3 
E) 150 in3

Question 12

Liquid nitrogen boils at -195.8°C.Express the boiling point of liquid nitrogen in °F.

Accepted Answer

A) -384.4°F 
B) -352.4°F 
C) -320.4°F 
D) -140.8°F 
E) -76.8°F 
A) -384.4°F 
B) -352.4°F 
C) -320.4°F 
D) -140.8°F 
E) -76.8°F

Question 13

How many significant figures does the difference 218.7201 - 218.63 contain?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) 7 
A) 1 
B) 2 
C) 3 
D) 5 
E) 7

Question 14

You just measured a sugar cube and obtained the following information:
mass = 3.48 g
height = length = width = 1.3 cm
Determine the volume and density of the cube.Suppose the sugar cube was added to a cup of water.Before it dissolves, will the sugar cube float or sink to the bottom?

Accepted Answer

Volume of the sugar cube = 2.2

Question 15

How many significant figures does the number 30.40 contain?

Accepted Answer

The answer of How many significant figures does the number...

Question 16

Classify the following as a physical or chemical change: Food spoils.

Accepted Answer

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

Question 17

Which of the following speeds is the greatest? (1 mile = 1609 m)

Accepted Answer

A) 40 mi/h 
B) 2.0 × 105 mm/min 
C) 40 km/h 
D) 0.74 km/min 
E) 400 m/min 
A) 40 mi/h 
B) 2.0 × 105 mm/min 
C) 40 km/h 
D) 0.74 km/min 
E) 400 m/min

Question 18

Which one of the following represents a physical change?

Accepted Answer

A) water, when heated to 100°C, forms steam 
B) bleach turns hair yellow 
C) sugar, when heated, becomes brown 
D) milk turns sour 
E) apples, when exposed to air, turn brown 
A) water, when heated to 100°C, forms steam 
B) bleach turns hair yellow 
C) sugar, when heated, becomes brown 
D) milk turns sour 
E) apples, when exposed to air, turn brown

Question 19

Convert 2.340 x 10-4 to decimal format.

Accepted Answer

A) 23,400 
B) 2,340 
C) 0.000234 
D) 0.0002340 
E) 0.002340 
A) 23,400 
B) 2,340 
C) 0.000234 
D) 0.0002340 
E) 0.002340

Question 20

Give the correct number of significant figures to the problem below. 4.5 x 1014 / 8.3 x 108 =

Accepted Answer

A) 5.4 x 1021 
B) 5.4 x 1022 
C) 5.4 x 106 
D) 5.4 x 1014 
E) 5.4 x 105 
A) 5.4 x 1021 
B) 5.4 x 1022 
C) 5.4 x 106 
D) 5.4 x 1014 
E) 5.4 x 105

Exam 1: Chemistry: the Study of Change

Classify the following as an element, a compound, or a mixture: Air.

The SI base unit of time is the hour.

Give the correct number of significant figures and units to the problem below. 3.4 x 10-2 mg + 448 µg =

The highest temperature ever recorded in Phoenix, Arizona, was 122°F.Express this temperature in °C.

Complete the following sentence.A scientific law is

How many significant figures does the number 0.07010 contain?

Define mixture.

The SI prefixes kilo and milli represent, respectively:

What is the volume, in cubic inches, of a brick that is 4.0 in × 2.7 in × 8.0 in?

Liquid nitrogen boils at -195.8°C.Express the boiling point of liquid nitrogen in °F.

How many significant figures does the difference 218.7201 - 218.63 contain?

You just measured a sugar cube and obtained the following information: mass = 3.48 g height = length = width = 1.3 cm Determine the volume and density of the cube.Suppose the sugar cube was added to a cup of water.Before it dissolves, will the sugar cube float or sink to the bottom?

How many significant figures does the number 30.40 contain?

Classify the following as a physical or chemical change: Food spoils.

Which of the following speeds is the greatest? (1 mile = 1609 m)

Which one of the following represents a physical change?

Convert 2.340 x 10-4 to decimal format.

Give the correct number of significant figures to the problem below. 4.5 x 1014 / 8.3 x 108 =

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

Give the correct number of significant figures and units to the problem below. 3.4 x 10^-2 mg + 448 µg =

Convert 2.340 x 10^-4 to decimal format.

Give the correct number of significant figures to the problem below. 4.5 x 10¹⁴ / 8.3 x 10⁸ =