1. Chapter 2 Test Review

2. If a material contains two or more elements joined in a fixed proportion, it is a(an)
a. mixture.
b. atom.
c. solution.
d. compound.

3. Which of the following is a pure substance?
a. solutions
b. homogeneous mixtures
c. compounds
d. colloids

4. A substance that is made up of only one kind of atom is a(an)
a. compound.
b. element.
c. homogeneous mixture.
d. solution.

5. Which of the following is a characteristic of a mixture?
a. has varying properties
b. contains only pure substances
c. has a fixed composition
d. both a and b

6. A mixture that appears to contain only one substance is a(an)
a. homogeneous mixture.
b. compound.
c. heterogeneous mixture.
d. element.

7. A mixture can be classified as a solution, suspension, or colloid based on the
a. number of particles it contains.
b. color of its particles.
c. size of its largest particles.
d. size of its smallest particles.

8. Filtration can be used to separate mixtures based on
a. their boiling points.
b. their melting points.
c. their densities.
d. the size of their particles.

9. What method can be used to separate salt water that can pass through a filter?
a. filtration
b. straining
c. distillation
d. screening

10. Which of the following is a physical change?
a. cutting a piece of wood in half
b. burning a piece of wood
c. rust forming on an iron fence
d. both b and c

11. Which of the following is a chemical change?
a. ice melting
b. ice being carved
c. water boiling
d. none of these

12. Which of the following is a clue of a chemical change?
a. iron changes color when heated
b. gas bubbles form in boiling water
c. balls of wax form when melted wax is poured into ice water
d. a gas forms when vinegar and baking soda are mixed

13. Matter that always has exactly the same composition is classified as a(an)
A. pure substance
B. homogeneous mixture
C. heterogeneous mixture
D. none of these

14. An element has a fixed composition because it contains only one type of
A. compound
B. atom
C. mixture
D. solution

15. How do changes increasing temperature usually affect the viscosity of a liquid?
A. decreases viscosity
B. increases viscosity
C. Both A and B
D. Not A or B