Unit #2 Test: Matter and It's Changes

11. Which of the following materials is a pure substance?

• air
• gasoline
• tap water
• iron

12. An example of a homogenous mixture is _____.

• water
• air

• chicken noodle soup
• oxygen

13. When a sliced apple is exposed to air and turns brown, what type of change is likely taking place?

• a physical change
• a chemical change
• neither a physical change nor a chemical change
• both a physical and a chemical change

14. An example of an extensive property of matter is ____.

• melting point
• density
• volume

• texture

15. What must happen for a chemical change to occur?

• There must be change in composition.
• There must be a change in physical properties.
• The change must involve a change in mass.
• The change must involve a change in volume.

16.

• 142 grams
• 102 grams
• 40 grams
• 78 grams

17. Which of the following CANNOT be classified as a substance?

• table salt
• tap water

• nitrogen
• gold

18. Which action changes the identity of the substance referenced?

• melting gold
• running an electric current through copper
• corroding iron
• breaking an ice cube

19. Which state of matter takes both the shape and volume of its container?

• a. solid
• b. liquid
• c. gas
• d. both b and c

20. Which of the following are considered physical properties of a substance?

• color and odor
• melting and boiling points
• malleability and hardness
• all of the above