Test- Unit 2 Matter

Question 1

10. Three examples of physical changes are

Answer 1

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

U2 C2 Notes

Question 2

12. Matter in which the particles are free to move in all directions until they have spread evenly throughout their container is a

Answer 2

Gas

U2 C3 Notes

Question 3

14. What is another name for a homogeneous mixture?

Answer 3

Solution

U2 C1 Notes

Question 4

16. Increasing the surface area of a solid dose what?

Answer 4

Makes the solute dissolve fast in the solvent

U2 C4 notes
pg. 33

Question 5

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

Answer 5

Evaporation

U2 C3 notes
pg. 28

Question 6

29. Would syrup, water, lemonade, or soda be more viscous?

Answer 6

Syrup

U2 C2 notes
pg. 10

Question 7

36. Is the fragrance of a flower a physical property, physical change, chemical property, or a chemical change?

Answer 7

Physical Property

U2 C2 notes
pg. 10

Question 8

44. How many grams of NaCIO3 are needed to make a saturated solution in 100g of water at 90°C?

Answer 8

160g

Practice- solubility curve
pg. 34

Question 9

45. In terms of saturation, how would you classify a KBr solution with a concentration of90g in 100g of water at 10°C?

Answer 9

Saturated

U2 Practice- Solubility Curve
pg. 34

Question 10

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

Answer 10

35°C

U2 Practice- Solubility Curve
pg. 34

Question 11

48. The solubility of which salt is the least affected by temperature?

Answer 11

NaCl

U2 Practice- Solubility Curve
pg. 34

Question 12

49. What happens in between melting and boiling?

Answer 12

Heat heat of fusion

U2 C3 notes
pg. 29

Question 13

49. What happens in between a liquid becoming a gas, and evaporation?

Answer 13

Heat of vaporization

U2 C3 notes
pg. 29

Question 14

50 c. What happens when a gas turns into a liquid?

Answer 14

Condensation

U2 C3 notes
pg. 28

Question 15

52. Bose-Einstein condensates are used to simulate conditions in what

Answer 15

Black holes

U2 C3
pg. 27

Question 16

53. Iron and oxygen react to form rust. What will happen to the mass of the rust compared to the mass of the iron and oxygen before reaction? Explain why this will occur.

Answer 16

The mass will not change, because the rusting is a chemical change.

U2 C2 notes
pg. 10

Question 17

60. Explain how salt dissolves, in water.

Answer 17

Water is polar, and ionic compounds (like salt) will dissolve well in water because of the attraction of opposite charges.

U2 C4 notes pg 33