Question 1

Which of the following is a chemical change?

Accepted Answer

Combustion of gasoline to form carbon dioxide and water

Question 2

A student places acetone in a freezer at $$-20\ ^\circ\mathrm{C} . $$Given acetone's melting point is $$-95\ ^\circ\mathrm{C}$$ and boiling point is $$56\ ^\circ\mathrm{C}$$, what is the physical state of acetone in the freezer?

Accepted Answer

Liquid

Question 3

Which property is most influential in determining the state of matter of a substance at a given time?

Accepted Answer

Temperature

Question 4

Which of the following best describes a solid?

Accepted Answer

A substance with definite volume and definite shape

Question 5

Electrolysis of water produces hydrogen and oxygen gases. What type of change is this?

Accepted Answer

Chemical change

Question 6

Methane has a melting point of $$-182\ ^\circ\mathrm{C}$$ and a boiling point of $$-162\ ^\circ\mathrm{C}. $$What is the state of methane at $$-20\ ^\circ\mathrm{C}$$?

Accepted Answer

Gas

Question 7

Which of the following is NOT a physical change?

Accepted Answer

Oxidation of copper metal

Question 8

What is the definition of boiling point?

Accepted Answer

The temperature at which a substance changes from liquid to gas

Question 9

Which of the following scenarios best illustrates a chemical change?

Accepted Answer

Copper metal reacting with oxygen to form copper(II) oxide

Question 10

A sample of potassium chloride is dissolved in water. What type of change occurs?

Accepted Answer

Physical change

Question 11

Which of the following statements about gases is correct?

Accepted Answer

Gases have indefinite volume and indefinite shape

Question 12

Which of the following factors does NOT directly influence the state of matter?

Accepted Answer

Color

Question 13

A student heats a sample of water from $$-10\ ^\circ\mathrm{C} to$$ $$110\ ^\circ\mathrm{C}. $$Which phase changes will occur during this process?

Accepted Answer

Melting and boiling

Question 14

Which of the following is the best definition of matter?

Accepted Answer

Anything that has mass and occupies space

Question 15

Which process is represented by the equation $$\mathrm{CO}_2 (s) \rightarrow \mathrm{CO}_2 (g)$$?

Accepted Answer

Sublimation

Question 16

Which of the following is true about liquids?

Accepted Answer

Liquids have indefinite shape and definite volume

Question 17

A patient receives oxygen gas in a hospital. Which property of oxygen allows it to fill the entire volume of the container?

Accepted Answer

Indefinite volume

Question 18

Which of the following is a physical change that occurs in the kitchen?

Accepted Answer

Boiling water to cook pasta

Question 19

Which of the following best describes the melting point?

Accepted Answer

The temperature at which a substance changes from solid to liquid

Question 20

Which of the following is a chemical change that occurs in the environment?

Accepted Answer

Formation of rust on iron structures

States of Matter: Physical and Chemical Changes

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