Unit 2 Matter

Question 1

4. Which of the following is not a physical property?

Answer 1

Reactivity with oxygen; U2C2

Question 2

9. The color of ink is….

Answer 2

Physical property; U2C2

Question 3

10. Three examples of physical changes are…

Answer 3

Boiling of water, blowing up a balloon, and melting a candle. U2C2

Question 4

16. Increasing the surface area of a solid…

Answer 4

Increases the speed of dissolving; U2C3

Question 5

18. A solution that contains all of the solute it can normally hold at a given temp is…

Answer 5

Saturated; U2C3

Question 6

26. The particles in a liquid are usually…

Answer 6

Closer together and lower energy than a gas; U2C3

Question 7

27. Using the data table to the right determine the identity of a cube of metal that measures 1.2cm on each side and has a mass of 18.15grams.

Answer 7

Silver; U2C2

Question 8

28. A solution that contains more of the solute than it can normally hold at a given temp is…

Answer 8

Supersaturated; U2C3

Question 9

36.fragrance of a flower

Answer 9

Physical property; U2C2

Question 10

37. Burning pocorn and making water

Answer 10

Chemical change; U2C2

Question 11

38. Flammability of a substance

Answer 11

Chemical property; U2C2

Question 12

39. Inflating a tire

Answer 12

Physical change; U2C2

Question 13

40. Boiling water

Answer 13

Physical change; U2C2

Question 14

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

Answer 14

180g; U2C2

Question 15

45. In terms of saturation, how would you classify a KBr solution with a concentration of 90g in 100g of water at 10°C?

Answer 15

Supersaturated; U2C3

Question 16

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

Answer 16

Unsaturated; U2C3

Question 17

48. The solubility of Which salt is the least affected by tempature?

Answer 17

NaCl; U2C3

Question 18

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

Answer 18

Black hole; U2C4

Question 19

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 the reaction? Explain why this with occur.

Answer 19

Same bc law of conservation of mass says matter cannot be created or destroyed, even in a chemical change. U2C2

Question 20

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

Answer 20

1. Solute size- rate bc move surface area
2. Temp- rate bc more ke particles collide more
3. Stirring- rate bc it brings fresh solvent in contact w solute; U2C4

Question 21

56. A piece of wood that measures 3 cm by 6 cm by 4 cm has a mass of 80g. What is the density of the wood? If the density of water is 1g/mL, would the wood float in water?

Answer 21

V= 3 x 6 x 4= 72cm3
M= 80g
D= ?
D= m/v
D= 80/72 
D= 1.11g/mL
U2C4

Question 22

57. Find the mass of a 50mL volume of water if the density of water is 1g/mL.

Answer 22

M= ?
V= 50mL
D= 1g/mL
D= m/v(v)

M= vd
M= (50)(1)
M= 50g
U2C4

Question 23

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

Answer 23

V= 46.2-33.5 = 12.7mL
M= 16.25g
D= ?
D= m/v

D= 16.25/12.7
D= 1.28g/mL
U2C4

Question 24

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

Answer 24

Similarity- both involve >| elements.

Difference- compound is chemically combined + mixture is physically.U2C3