Question 1

The number 1.050 × 109 has how many significant figures?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 9 
E) 13 
A) 2 
B) 3 
C) 4 
D) 9 
E) 13

Question 2

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 3

Select the answer that expresses the result of this calculation with the correct number of significant figures. 13.602 x 1.90 x 3.06
--------------------------------
4)2 x 1.4097

Accepted Answer

A) 13.3568 
B) 13.357 
C) 13.36 
D) 13.4 
E) 13 
A) 13.3568 
B) 13.357 
C) 13.36 
D) 13.4 
E) 13

Question 4

Iron has a density of 7.87 g/cm3.What mass of iron would be required to cover a football playing surface of 120 yds × 60.yds to a depth of 1.0 mm? (1 inch = 2.54 cm)

Accepted Answer

A) 76 kg 
B) 47 Mg 
C) 7.6 × 105 g 
D) 4.7 × 108 g 
E) 1.9 × 107 g 
A) 76 kg 
B) 47 Mg 
C) 7.6 × 105 g 
D) 4.7 × 108 g 
E) 1.9 × 107 g

Question 5

What is the term used for findings that are summarized based on a pattern or trend?

Accepted Answer

A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction 
A) Law 
B) Hypothesis 
C) Theory 
D) Phenomena 
E) Prediction

Question 6

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Accepted Answer

A hypothesis should be capable

Question 7

Radio waves travel at the speed of light,which is 3.00 × 108 m/s.How many kilometers will radio messages to outer space travel in exactly one year? (365.24 days = 1 y)

Accepted Answer

A) 9.46 × 1015 km 
B) 7.30 × 108 km 
C) 7.10 × 1010 km 
D) 9.47 × 1012 km 
E) 3.33 × 10- 3 km 
A) 9.46 × 1015 km 
B) 7.30 × 108 km 
C) 7.10 × 1010 km 
D) 9.47 × 1012 km 
E) 3.33 × 10- 3 km

Question 8

The density of a substance is an intensive property.

Accepted Answer

A) True 
 B)False

Question 9

A(n)__________ is something that has a definite composition.

Accepted Answer

The answer of A(n)__________ is something that has a definite...

Question 10

Express 122.0°F 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 11

Explain the difference between a heterogeneous mixture and a homogeneous mixture.

Accepted Answer

A homogeneous mixture has a un

Question 12

The average distance between the Earth and the Moon is 240,000 miles.Express this distance in kilometers.(1 mi = 1609 m)

Accepted Answer

A) 6.1 × 105 km 
B) 5.3 × 105 km 
C) 3.9 × 105 km 
D) 1.5 × 105 km 
E) 9.4 × 104 km 
A) 6.1 × 105 km 
B) 5.3 × 105 km 
C) 3.9 × 105 km 
D) 1.5 × 105 km 
E) 9.4 × 104 km

Question 13

The boiling point for liquid helium is 4.0 K.What is the temperature in degrees Fahrenheit?

Accepted Answer

A) -452.5°F 
B) -498.9°F 
C) -237.2°F 
D) 131.8°F 
E) 530.9°F 
A) -452.5°F 
B) -498.9°F 
C) -237.2°F 
D) 131.8°F 
E) 530.9°F

Question 14

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 15

You prepare 1000.mL of tea and transfer it to a 1.00 quart pitcher for storage.Which of the following statements is true? (1 L = 1.0567 qt)

Accepted Answer

A) The pitcher will be filled to 100% of its capacity with no tea spilled. 
B) The pitcher will be filled to about 95% of its capacity. 
C) The pitcher will be filled to about 50% of its capacity. 
D) The pitcher will be completely filled and a small amount of tea will overflow. 
E) The pitcher will be completely filled and most of the tea will overflow. 
A) The pitcher will be filled to 100% of its capacity with no tea spilled. 
B) The pitcher will be filled to about 95% of its capacity. 
C) The pitcher will be filled to about 50% of its capacity. 
D) The pitcher will be completely filled and a small amount of tea will overflow. 
E) The pitcher will be completely filled and most of the tea will overflow.

Question 16

Talc is a mineral with low conductivity for heat and electricity which is not attacked by acid.It is used in talcum powder and face powder.Suppose a sample of talc weighs 13.65 g with a density of 1.75 g/cm3 in mineral oil.If this same sample of talc in air weighs 35.97 g,assuming no volume change,what is the density of the talc sample in air?

Accepted Answer

A) 4.61 g/cm3 
B) 2.82 g/cm3 
C) 2.63 g/cm3 
D) 2.44 g/cm3 
E) 1.61 g/cm3 
A) 4.61 g/cm3 
B) 2.82 g/cm3 
C) 2.63 g/cm3 
D) 2.44 g/cm3 
E) 1.61 g/cm3

Question 17

Explain the difference between a hypothesis and a theory.

Accepted Answer

A hypothesis is a tentative ex

Question 18

The volume of a substance is an intensive property.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following activities is not a part of good science?

Accepted Answer

A) Proposing a theory 
B) Developing a hypothesis 
C) Making quantitative observations 
D) Designing experiments 
E) Indulging in speculation 
A) Proposing a theory 
B) Developing a hypothesis 
C) Making quantitative observations 
D) Designing experiments 
E) Indulging in speculation

Question 20

Which of the following is an example of an observation?

Accepted Answer

A) Gases expand as their temperature increases because the gas molecules are moving more rapidly. 
B) Paraffin wax begins to melt at 57°C. 
C) Three samples of wax are heated to 75°C. 
D) The force acting on an object is equal to its mass times its acceleration. 
E) Will all waxes melt at the same temperature? 
A) Gases expand as their temperature increases because the gas molecules are moving more rapidly. 
B) Paraffin wax begins to melt at 57°C. 
C) Three samples of wax are heated to 75°C. 
D) The force acting on an object is equal to its mass times its acceleration. 
E) Will all waxes melt at the same temperature?

Exam 1: Chemistry: the Central Science

The number 1.050 × 109 has how many significant figures?

Which one of these represents a chemical change?

Select the answer that expresses the result of this calculation with the correct number of significant figures. 13.602 x 1.90 x 3.06 -------------------------------- 4)2 x 1.4097

Iron has a density of 7.87 g/cm3.What mass of iron would be required to cover a football playing surface of 120 yds × 60.yds to a depth of 1.0 mm? (1 inch = 2.54 cm)

What is the term used for findings that are summarized based on a pattern or trend?

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Radio waves travel at the speed of light,which is 3.00 × 108 m/s.How many kilometers will radio messages to outer space travel in exactly one year? (365.24 days = 1 y)

The density of a substance is an intensive property.

A(n)__________ is something that has a definite composition.

Express 122.0°F in °C.

Explain the difference between a heterogeneous mixture and a homogeneous mixture.

The average distance between the Earth and the Moon is 240,000 miles.Express this distance in kilometers.(1 mi = 1609 m)

The boiling point for liquid helium is 4.0 K.What is the temperature in degrees Fahrenheit?

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

You prepare 1000.mL of tea and transfer it to a 1.00 quart pitcher for storage.Which of the following statements is true? (1 L = 1.0567 qt)

Explain the difference between a hypothesis and a theory.

The volume of a substance is an intensive property.

Which of the following activities is not a part of good science?

Which of the following is an example of an observation?

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

Filters

The number 1.050 × 10⁹ has how many significant figures?

Iron has a density of 7.87 g/cm³.What mass of iron would be required to cover a football playing surface of 120 yds × 60.yds to a depth of 1.0 mm? (1 inch = 2.54 cm)

Radio waves travel at the speed of light,which is 3.00 × 10⁸ m/s.How many kilometers will radio messages to outer space travel in exactly one year? (365.24 days = 1 y)