Question 1

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

Accepted Answer

A)  269.01860 cm 
B)  269.0186 cm 
C)  269.019 cm 
D)  269.02 cm 
E)  269.0 cm 
A)  269.01860 cm 
B)  269.0186 cm 
C)  269.019 cm 
D)  269.02 cm 
E)  269.0 cm E

Question 2

A ________ mixture has a uniform composition throughout.

Accepted Answer

A)  heterogeneous 
B)  homologous 
C)  homogeneous 
D)  heterologous 
A)  heterogeneous 
B)  homologous 
C)  homogeneous 
D)  heterologous C

Question 3

What is a substance that cannot be separated into simpler substances by chemical means?

Accepted Answer

element

Question 4

Boiling point and melting point are extensive properties.

Accepted Answer

A) True 
 B)False

Question 5

A(n)________ is a combination of two or more substances in which the substances retain their distinct identities.

Accepted Answer

The answer of A(n)________ is a combination of two or...

Question 6

Which of the following is not an SI base unit?

Accepted Answer

A)  Meter 
B)  Ampere 
C)  Second 
D)  Gram 
E)  Kelvin 
A)  Meter 
B)  Ampere 
C)  Second 
D)  Gram 
E)  Kelvin

Question 7

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

Accepted Answer

A)  1.27 × 105 cm 
B)  1.27 × 106 cm 
C)  1.27 × 107 cm 
D)  1.27 × 108 cm 
E)  1.27 × 109 cm 
A)  1.27 × 105 cm 
B)  1.27 × 106 cm 
C)  1.27 × 107 cm 
D)  1.27 × 108 cm 
E)  1.27 × 109 cm

Question 8

If two numbers are multiplied together, one which has 3 significant figures and the other which has 4 significant figures, explain how to round the answer.

Accepted Answer

The answer will have 3 signifi

Question 9

How many significant figures does the sum 8.5201 + 1.93 contain?

Accepted Answer

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

Question 10

What is a substance composed of atoms of two or more elements chemically united in fixed proportions?

Accepted Answer

The answer of What is a substance composed of atoms...

Question 11

Identify this process as a physical or chemical change: Bacteria convert milk to yogurt.

Accepted Answer

The answer of Identify this process as a physical or...

Question 12

Zero kelvin 0 K < 0°F < 0°C.

Accepted Answer

A) True 
 B)False

Question 13

What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)

Accepted Answer

A)  1.08 mL 
B)  947 mL 
C)  0.925 mL 
D)  0.95 mL 
E)  1.1 mL 
A)  1.08 mL 
B)  947 mL 
C)  0.925 mL 
D)  0.95 mL 
E)  1.1 mL

Question 14

The volume of a substance is an intensive property.

Accepted Answer

A) True 
 B)False

Question 15

Explain the rule for significant figures for addition and subtraction.

Accepted Answer

The answer cannot have more di

Question 16

Which one of these represents a chemical change?

Accepted Answer

A)  Boiling water to form steam 
B)  Turning hair yellow with bleach 
C)  Melting butter 
D)  Mixing powdered charcoal and oxygen at room temperature 
E)  Cutting a bar of sodium metal into pieces with a knife 
A)  Boiling water to form steam 
B)  Turning hair yellow with bleach 
C)  Melting butter 
D)  Mixing powdered charcoal and oxygen at room temperature 
E)  Cutting a bar of sodium metal into pieces with a knife

Question 17

What is the equation used to calculate the mass from the density?

Accepted Answer

mass = den

Question 18

The mask of an empty flask is 17.4916 g, and its mass when filled with water at 20.0°C (density = 0.9982 g/mL) is 43.9616 g. The density of "heavy water" at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at 20.0°C?

Accepted Answer

A)  29.2573 g 
B)  46.8016 g 
C)  46.7489 g 
D)  29.3100 g 
E)  43.9140 g 
A)  29.2573 g 
B)  46.8016 g 
C)  46.7489 g 
D)  29.3100 g 
E)  43.9140 g

Question 19

What is a combination of two or more substances in which the substances retain their distinct identities?

Accepted Answer

The answer of What is a combination of two or...

Question 20

A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?

Accepted Answer

A)  4.46 g/mL 
B)  4460 g/mL 
C)  2.20 g/mL 
D)  0.455 g/mL 
E)  44.6 g/mL 
A)  4.46 g/mL 
B)  4460 g/mL 
C)  2.20 g/mL 
D)  0.455 g/mL 
E)  44.6 g/mL

Exam 1: Chemistry: the Central Science

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

A ________ mixture has a uniform composition throughout.

What is a substance that cannot be separated into simpler substances by chemical means?

Boiling point and melting point are extensive properties.

A(n)________ is a combination of two or more substances in which the substances retain their distinct identities.

Which of the following is not an SI base unit?

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

If two numbers are multiplied together, one which has 3 significant figures and the other which has 4 significant figures, explain how to round the answer.

How many significant figures does the sum 8.5201 + 1.93 contain?

What is a substance composed of atoms of two or more elements chemically united in fixed proportions?

Identify this process as a physical or chemical change: Bacteria convert milk to yogurt.

Zero kelvin 0 K < 0°F < 0°C.

What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)

The volume of a substance is an intensive property.

Explain the rule for significant figures for addition and subtraction.

Which one of these represents a chemical change?

What is the equation used to calculate the mass from the density?

The mask of an empty flask is 17.4916 g, and its mass when filled with water at 20.0°C (density = 0.9982 g/mL) is 43.9616 g. The density of "heavy water" at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at 20.0°C?

What is a combination of two or more substances in which the substances retain their distinct identities?

A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

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

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

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