Question 1

The phase in which atoms and molecules no longer move is the

Accepted Answer

A) solid phase. 
B) liquid phase. 
C) gas phase. 
D) none of the above 
A) solid phase. 
B) liquid phase. 
C) gas phase. 
D) none of the above D

Question 2

How would you describe the volume of the following object? the amount of water in a swimming pool

Accepted Answer

A) microscopic 
B) macroscopic 
C) submicroscopic 
D) all of the above 
E) none of the above 
A) microscopic 
B) macroscopic 
C) submicroscopic 
D) all of the above 
E) none of the above B

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

A) gasoline being used in the engine of a car producing exhaust 
B) water freezing into ice crystals 
C) aftershave or perfume on your skin generating a smell 
D) a piece of metal expanding when heated, but returning to original size when cooled 
E) breaking a glass window 
A) gasoline being used in the engine of a car producing exhaust 
B) water freezing into ice crystals 
C) aftershave or perfume on your skin generating a smell 
D) a piece of metal expanding when heated, but returning to original size when cooled 
E) breaking a glass window A

Question 4

What is the name of the following compound? CO₂

Accepted Answer

A) carbon dioxide 
B) dicobalt 
C) dioxocarbon 
D) calcium oxide 
E) calcium dioxide 
A) carbon dioxide 
B) dicobalt 
C) dioxocarbon 
D) calcium oxide 
E) calcium dioxide

Question 5

When a solid is changed to a liquid phase, the solid

Accepted Answer

A) releases energy. 
B) absorbs energy. 
C) neither A nor B 
A) releases energy. 
B) absorbs energy. 
C) neither A nor B

Question 6

Turns into a white powder when heated in the presence of oxygen.

Accepted Answer

The answer of Turns into a white powder when heated...

Question 7

There are only 115 elements in the periodic table, but a far greater variety of materials that surround us. How is this possible?

Accepted Answer

It is the great number of different poss

Question 8

Humidity is a measure of the amount of water vapor in the atmosphere. Why is humidity always very low inside your kitchen freezer?

Accepted Answer

A) because the kitchen freezer is most often sealed off from the atmosphere 
B) because the frost in the freezer absorbs this moisture 
C) because it is not possible for water to be in the gaseous phase at temperatures below 0°C 
D) because at the cold temperatures of your kitchen freezer, water molecules in the vapor phase are moving relatively slowly, which makes it easier for them to stick to inner surfaces within the freezer or to other water molecules. 
A) because the kitchen freezer is most often sealed off from the atmosphere 
B) because the frost in the freezer absorbs this moisture 
C) because it is not possible for water to be in the gaseous phase at temperatures below 0°C 
D) because at the cold temperatures of your kitchen freezer, water molecules in the vapor phase are moving relatively slowly, which makes it easier for them to stick to inner surfaces within the freezer or to other water molecules.

Question 9

Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?

Accepted Answer

A) a physical change 
B) a chemical change 
C) a molecular change 
D) a decomposition 
E) none of the above 
A) a physical change 
B) a chemical change 
C) a molecular change 
D) a decomposition 
E) none of the above

Question 10

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C. Which of the following statements is true?

Accepted Answer

A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above 
A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above

Question 11

Is the following transformation representative of a physical change or a chemical change?

Accepted Answer

A) chemical change because of the formation of elements 
B) physical change because a new material has been formed 
C) chemical change because the atoms are connected differently 
D) physical change because of a change in phase 
A) chemical change because of the formation of elements 
B) physical change because a new material has been formed 
C) chemical change because the atoms are connected differently 
D) physical change because of a change in phase

Question 12

Evaporation is a cooling process because

Accepted Answer

A) heat is radiated during the process. 
B) of conduction and convection. 
C) the more energetic molecules are able to escape the liquid. 
D) the temperature of the remaining liquid decreases. 
E) none of the above 
A) heat is radiated during the process. 
B) of conduction and convection. 
C) the more energetic molecules are able to escape the liquid. 
D) the temperature of the remaining liquid decreases. 
E) none of the above

Question 13

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

Accepted Answer

A) molecule A because it is the first to transform into a liquid 
B) molecule B because it is first to transform into a liquid 
C) molecule A because it remains in the gaseous phase 
D) molecule B because it remains in the gaseous phase 
A) molecule A because it is the first to transform into a liquid 
B) molecule B because it is first to transform into a liquid 
C) molecule A because it remains in the gaseous phase 
D) molecule B because it remains in the gaseous phase

Question 14

What chemical change occurs when a wax candle burns?

Accepted Answer

A) The wax near the flame melts. 
B) The molten wax is pulled upwards through the wick. 
C) The wax within the wick is heated to about 600°C. 
D) The heated wax molecules combine with oxygen molecules. 
A) The wax near the flame melts. 
B) The molten wax is pulled upwards through the wick. 
C) The wax within the wick is heated to about 600°C. 
D) The heated wax molecules combine with oxygen molecules.

Question 15

A hot dog pants

Accepted Answer

A) to help evaporation occur in its mouth and bronchial tract. 
B) to bring more oxygen into its lungs. 
C) for no particular reason. 
D) to impress dogs of the opposite sex. 
A) to help evaporation occur in its mouth and bronchial tract. 
B) to bring more oxygen into its lungs. 
C) for no particular reason. 
D) to impress dogs of the opposite sex.

Question 16

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.

Accepted Answer

A) chemical; physical; chemical; chemical 
B) chemical; physical; physical; physical 
C) physical; physical; chemical; physical 
D) chemical; physical; chemical; physical 
A) chemical; physical; chemical; chemical 
B) chemical; physical; physical; physical 
C) physical; physical; chemical; physical 
D) chemical; physical; chemical; physical

Question 17

Which of the following can be classified as matter?

Accepted Answer

A) water 
B) sand 
C) perfume 
D) ice cream 
E) all of the above 
A) water 
B) sand 
C) perfume 
D) ice cream 
E) all of the above

Question 18

The following image describes what type of change?

Accepted Answer

A) a chemical change 
B) a physical change 
C) a change in state 
D) no change 
E) an elemental change 
A) a chemical change 
B) a physical change 
C) a change in state 
D) no change 
E) an elemental change

Question 19

A sample of iron weighs more after it rusts because

Accepted Answer

A) it has expanded into a greater volume. 
B) rust contains twice as many iron atoms. 
C) of the additional oxygen it contains. 
D) Wrong. Iron actually weighs less after it rusts. 
A) it has expanded into a greater volume. 
B) rust contains twice as many iron atoms. 
C) of the additional oxygen it contains. 
D) Wrong. Iron actually weighs less after it rusts.

Question 20

The diagram on the left in box A shows the interface of solid and liquid phases of a single substance where each sphere represents a molecule of that substance. Which box, A, B, or C best represents what the molecules of this substance would look like if heat were added? Which box best represents what the molecules of this substance would look like if heat were taken away?

Accepted Answer

A) A and C 
B) B and C 
C) A and B 
D) C and B 
A) A and C 
B) B and C 
C) A and B 
D) C and B

Exam 11: Investigating Matter

The phase in which atoms and molecules no longer move is the

How would you describe the volume of the following object? the amount of water in a swimming pool

Which of the following is an example of a chemical change?

What is the name of the following compound? CO₂

When a solid is changed to a liquid phase, the solid

Turns into a white powder when heated in the presence of oxygen.

There are only 115 elements in the periodic table, but a far greater variety of materials that surround us. How is this possible?

Humidity is a measure of the amount of water vapor in the atmosphere. Why is humidity always very low inside your kitchen freezer?

Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C. Which of the following statements is true?

Is the following transformation representative of a physical change or a chemical change?

Evaporation is a cooling process because

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

What chemical change occurs when a wax candle burns?

A hot dog pants

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.

Which of the following can be classified as matter?

The following image describes what type of change?

A sample of iron weighs more after it rusts because

About Science

Describing Motion

Newtons Laws of Motion

Momentum and Energy

Gravity

Heat

Electricity and Magnetism

Waves-Sound and Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Chemical Bonds and Mixtures

Chemical Reactions

Organic Compounds

The Basic Unit of Life-The Cell

Genetics

The Evolution of Life

Diversity of Life on Earth

Human Biology Icontrol and Development

Human Biology Iicare and Maintenance

Ecology

Plate Tectonics

Rocks and Minerals

Earths Surfaceland and Water

Surface Processes

Weather

Environmental Geology

The Solar System

The Universe

Filters