Test- Unit 2- Matter

Question 1

1. Matter that has a definite volume and a definite shape is a

Answer 1

Solid

Unit 2 Concept 2 Page 2 notes

Question 2

10. Three examples of physical changes are

Answer 2

Boiling of water, blowing up a balloon, and melting a candle

Unit 1 Concept 2 Page 3

Question 3

14. Another name for a homogeneous mixture

Answer 3

Solution

Unit 2 Concept 1 Page 2

Question 4

16. Increasing the surface area of a solid

Answer 4

Increases the speed of dissolving

Unit 2 Concept 4 Page 3

Question 5

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

Answer 5

Average kinetic energies

Unit 2 Concept 3 Page 2

Question 7

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

Answer 7

Evaporation

Unit 2 Concept 3 Page 3

Question 8

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

Answer 8

1. smaller solute size increases rate because more surface area
2. Higher temperature increases rate because more particles collide more
3. Staring at a higher rate because it brings fresh solvent in contact with solute

Unit 2 Concept 4 Page 3

Question 9

59. Name one similarity between compounds and homogeneous mixtures and one difference.

Answer 9

Similarity: both have two substances in them
Difference: compounds are chemical and homogeneous is physical
U1 C1 Pages 1-2

Question 10

60. Explain how sought disassociates (dissolves) in water. Be specific.

Answer 10

1. The hydrogen which is positive attracts to Cl which is negative
2. Two O that are negative of water attract to Na which is positive
3. The attractive force pause I on the way from the crystal
4. Water surrounds each ion and continues until all ions are separated
   U2 C4 Notes Page 3