1. A pure substance contains:
A. only one type of particle
B. two types of particles
C. many types of particles
D. mixtures

2. An element is made up of:
A. one kind of atom
B. two kinds of atoms
C. compounds
D. mixtures

3. Water is an example of:
A. compound
B. element
C. mixture
D. metal

4. Air is a:
A. mixture
B. compound
C. element
D. pure substance

5. Salt dissolved in water forms a:
A. solution
B. suspension
C. element
D. compound

6. A homogeneous mixture has:
A. uniform composition
B. different layers
C. visible particles
D. uneven composition

7. Milk is an example of:
A. colloid
B. element
C. compound
D. metal

8. Sand in water forms:
A. suspension
B. solution
C. compound
D. element

9. In a solution the substance that dissolves is called:
A. solute
B. solvent
C. compound
D. element

10. The medium in which a solute dissolves is called:
A. solvent
B. solute
C. mixture
D. compound

11. A heterogeneous mixture has:
A. non uniform composition
B. uniform composition
C. same particles
D. fixed structure

12. The particles in a solution are:
A. very small
B. very large
C. visible
D. heavy

13. A suspension is:
A. a heterogeneous mixture
B. a homogeneous mixture
C. an element
D. a compound

14. Colloidal particles show:
A. Tyndall effect
B. melting
C. boiling
D. freezing

15. Filtration is used to separate:
A. insoluble solids from liquids
B. gases
C. liquids only
D. compounds

16. Evaporation is used to separate:
A. dissolved solids from liquids
B. gases from liquids
C. solids from gases
D. liquids from gases

17. Air is composed of:
A. many gases
B. one gas
C. only oxygen
D. only nitrogen

18. Sugar solution is:
A. homogeneous mixture
B. heterogeneous mixture
C. compound
D. element

19. Muddy water is:
A. suspension
B. solution
C. compound
D. element

20. Colloids appear to be:
A. homogeneous but are actually heterogeneous
B. heterogeneous only
C. pure substances
D. elements