test- unit 2 matter

Question 1

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

Answer 1

evaporation
U2 C3 Notes
p.28

Question 2

39. Inflating a tire

Answer 2

physical change
unit 2 concept 2 notes
p.10

Question 3

55. List and explain the three factors that increase the solubility(dissolving) rate of a substance

Answer 3

1. smaller solute size because it increases the surface area on the solute so the solvent has more places for contact.
2. heating the solvent because increasing the temperature increases the kinetic energy of the particles, therefore more collisions.

3.stirring the solution because it brings fresh solvent into contact with undissolved solute.
U2 C4 Notes
p.33

Question 4

60. Explains how salt dissolves in water.

Answer 4

An ionic compound like salt separates into ions, usually in a reversible manner. Positive ends of water (H) attract to negative ions of salt, negative ends of water (O) to attract to positive ions of salt.

Question 5

make sure to tell what the given is!

Answer 5

make sure to do this!