Test-Unit 2 matter test

Question 1

8. The color of ink is a?

Answer 1

B. Physical property

Unit 2, concept 2 page 8

Question 2

9. Three examples of a physical change are?

Answer 2

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

Unit 2, concept 2 page 10

Question 3

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

Answer 3

C. Gas

Unit 2, concept 2 page 9

Question 4

13. Is another name for a homogeneous mixture.

Answer 4

D. Solution

Unit 2, concept 1 page 3

Question 5

16. Increases the surface area of a solid?

Answer 5

A. Increases the speed of dissolving.

Unit 2, concept 3 page 28

Question 6

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 have equal?

Answer 6

B. Masses

Unit 2, concept unit 3 page 26

Question 7

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

Answer 7

B. Evaporation

Unit 2, concept 3 page 28

Question 8

26. The particles in liquid are usually?

Answer 8

D. Closer together and lower in energy than a gas.

Unit 2, concept 3 page 27

Question 9

32. Trail mix?

Answer 9

Heterogeneous.

Unit 2, concept 1 page 3

Question 10

36. Fragrance of a flower?

Answer 10

Physical change

Unit 2, concept 2 page 10

Question 11

37. Burning popcorn and making water.

Answer 11

Chemical change

Unit 2, concept 2 page 10

Question 12

39. Inflating a tire?

Answer 12

Physical change

Unit 2, concept 2 page 10

Question 13

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

Answer 13

180 g.

Unit 2, concept 4 page 27

Question 14

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

Answer 14

35 degrees Celsius

Unit 2, concept 4 page 27

Question 15

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

Answer 15

Sodium chloride , NaCL

Unit 2, concept 4 page 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 the reaction?

Answer 16

The mass will stay the same because of the law of conservation of mass.

Unit 2, concept 2 page 11

Question 17

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

Answer 17

1. Stir the solution, it moves the solution
2. Heat the solvent, the particles move more
3. Smaller solute size, smaller equals faster

Unit 2, concept 4 page 33

Question 18

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

Answer 18

Given= 50mL, 1 g/mL

Unit 2, concept 2 page 9.

Question 19

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 16.25 g, what is the density?

Answer 19

Vf= ?, Vi= ?

Solve= 12.7 mL.

Unit 2, concept 2 page 9.

Question 20

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

Answer 20

Similarity- they are both evenly distributed

Difference- compounds are physical, homogeneous are chemical.

Unit 2, concept 1 page 3

Question 21

60. Explain how salt dissociates.

Answer 21

The covalent bonds of water are stronger than the ionic bonds in the salt molecules. … Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.

Unit 2, concept 4 page 33.