Test - Unit 2 Matter

Question 1

14. Which of the following will speed up the dissolving of a solid in water?

A. Cool the solution
B. Grind up the solvent
C. Freeze the solute
D. Stir the solution

Answer 1

D. Stir the solution

Question 2

19. A flask containing molecules of gas A and a separate flask containing molecules of gas B are both at the same temperatures. Gases A and B must have equal

A. Volumes
B. Masses
C. Pressures
D. Average kinetic energy

Answer 2

C. Pressures

Question 3

4. When two or more substances are physically combined the result is a __________

A. Chemical Change
B. Element
C. Compound
D. Mixture

Answer 3

D. Mixture

Question 4

23. Which term best describes when particles escape from the surface of a liquid and become gaseous?

A. Sublimation
B. Evaporation
C. Vaporization
D. Deposition

Answer 4

B. Evaporation

Question 5

26. The particles of a liquid are usually

A. Closer together and lower energy than a solid
B. Farther apart and lower energy than a solid
C. Farther apart and higher energy than a gas
D. Closer together and lower energy than a gas

Answer 5

D. Closer together and lower energy

Question 6

At what temperature is the solubility of KBr the same as that of KNO3?

Answer 6

36° C

Question 7

49. Label the five parts of a heating curve.

Answer 7

1. Solid
2. Melting / Heat of Fusion
3. Liquid
4. Boiling / Heat of Vaporization
5. Gas

Question 8

D = 16.25g/12.7 mL

Answer 8

D = 1.28 g/mL

Question 9

Name one similarity between compounds and homogeneous mixtures, name one difference.

Answer 9

They are both the same throughout, homogeneous mixtures are not chemically combined, compounds are.