Test - Unit 2 Classification Of Matter

Question 1

18: Which shows the Tyndall Effect?

Answer 1

A. Colloids

Question 2

37: Burning popcorn and making water.

Answer 2

Chemical Change

Question 3

43: Rusting of a fishing pole.

Answer 3

Chemical Change

Question 4

49: Label the five parts of the heating curve.

Answer 4

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

Question 5

50: Label A, C, F on the states of matter picture.

Answer 5

A: Sublimation
C: Condensation
F: Freezing

Question 6

52: Bose-Einstein condensates are used to simulate conditions in a?

Answer 6

Atom

Question 7

55: List and Explain the three factors that increase the solubility rate of a substance.

Answer 7

1. Solute size increases the rate because there is more surface area.
2. Temperature increases the rate of solubility because the particles collide more.
3. Stirring increases the rate of solubility because it brings fresh solvent in contact with the solute.

Question 8

60: Explain how salt dissociates in water.

Answer 8

1. H+ of water attract CI-.
2. O-2 of water attract Na+.
3. Attractive force pulls ions away from the crystal.
4. Water surrounds each ion + continues until ions are separated.