Test-Unit-2 Matter Test

Question 1

16.Increasing the surface of a solid.

Answer 1

A. Increases the speed of dissolving.

Unit 2 Concept 4 pg.31

Question 2

45. In terms of saturation, how would you classify a KNO3 solution of 30 g in 100g of water at 40C?

Answer 2

Supersaturated

Unit 2 Concept 4 pg.32

Question 3

51. Name two places you can find plasma

Answer 3

51. Stars and Neon lights

Unit 2 Concept 3 pg.27

Question 4

58. A graduated cylinder has 33.5mL of water. A piece of metal is added to the water and the new volume is now 46.2mL. If the metal has a mass of 16.25g, what is its density?

Answer 4

D=M/V
D=16.25/12.7
D=1.28g/mL
Unit 2 Concept 2 pg.9

Question 5

59. Name one similarity between compounds and homogenous mixture.

Answer 5

They both involve less than one element.

Unit 2 Concept 1 pg.3

Question 6

60. Explain how salt dissociates in water

Answer 6

Positive particles of water attract to negative particles of salt.
The water has polarity so the negative and positive particles attract.
Attractive forces pull ion away from crystals
Water does this until the ions are separated.
Unit 2 Concept 4 pg.33