Energy & Heat Review

4

1

1

2

Does not emit as much pollution, does not burn fossil fuels…

B

3

4

1

4

3 1

5 6

Heat, electrical

4

7

4

2

8

9

2 3

10 11

3

12

Kinetic or mechanical

13

2

14

Pull the arrow back a little more before releasing it, use a lighter arrow…

15

Student B has a greater height.

As they enter they water they slow down, so KE decreases.

16

Takes up a lot of space, may affect organisms that live in the water, costs a lot of money to build

17

Generates electricity without pollution.

1

4

18

19

4

2

20

21

4

3

4

22

23

24

Once they are used up, they are no longer available because they take millions of years to form.

Releases pollutants into the air, releases carbon dioxide into the air which leads to global warming.

Using solar energy, wind energy, hydroelectricity…

25

2

2

26

27

Burning fossil fuels when driving cars or generating heat in homes.

28

They do not release pollutants in to the air or carbon dioxide.

They take up a lot of space, they can affect birds, if there is no wind, electricity cannot be generated.

29

3

30

There are more cars being used. There are more homes being built.

Install more wind turbines, install solar cells on buildings and homes.

31

liquid gas

Oil, natural gas

32

4

33

sun

Driving car, heating home, using barbeque

Solar energy, biomass

chemical mechanical

34

1

2

35

36

3

37

yes no no

yes

1

yes

2

no

3

38

2

4

39

40

Tightly packed together, side by side, in rows

They should slowly start to move away from each other.

They should start to move a little faster, sliding past each other.

41

Evaporation or boiling

Melting or condensation

42

2

43

condensation

melting

Evaporation

Its less dense than the water

44

It is less dense than the water

It dissolved in the water.

Use a strainer, or filter paper to separate the mixture.

45

1

3

46

47

3

3

48

49

2

50

solid liquid

51

2

1

52

53

1

54

4

2

55

The metal expanded when it was heated because the molecules moved faster and farther apart.

56

The ball is still made of the same material, and remained the same shape.

The ball expanded and changed in size but not in composition.

The ball is still made of the same type of metal. Composition did not change.

57

Cool it down by placing it in cold water.

As temperature increases, the speed of the molecules also increases.

58

2

1

59

60

Temperature

Surface area/size of the particles of sugar

61

Use filter paper or a strainer to separate the mixture.

Evaporate the water by heating it up.

62

3

63

saltsandwater

The substances are physically combined. They did not change into a new substance.

The water evaporated.

64

As temp increases the amount of solute than can dissolve increases.

65

36 g

As temp increases the solubility of the gas solute decreases.

66

Stir it, or heat it up.

1

67

2 2

68 69

30 100-70

70

1

2

71

72

4

73

74. Energy appears in many forms. Which form of energy is lightening?1.Magnetic2.Mechanical3.sound4.Electrical

4

75. When an electric current flows through a metal filament of a light bulb, the electrical energy is converted into1.heat energy, only2.heat and light energy3.light and motion energy

2

76. A high diver steps off a diving platform that is 10m above the water. If no air resistance is present, during the fall there will be a decrease in the diver’s 1.gravitational potential energy2.total mechanical energy3.kinetic energy4.momentum 1

• 77. If both of these balls are traveling down a bowling lane at the SAME speed, which one would have more kinetic energy? Support your answer.

Ball A – has a larger mass

78. Which of the following is an example of kinetic energy?1.A car not moving2.Water falling off a dam3.A rock resting on a ledge4.A person sitting in a chair

2

79. Which device produces mechanical energy?1.A battery2.A light bulb3.An electric motor4.A solar cooker

3

80. A song is playing on the radio. Which best describes the change in the flow of energy?1.Electrical energy light energy2.Electrical energy sound energy3.Sound energy light energy4.Sound energy electrical energy

2

81. At which two points on the pendulum, is the pendulum experiencing the greatest potential energy?A and D

(stops moving at these points)

82. Which skier will have a greater potential energy?  Support your answer.Skier 1 –

height is greater

83. As a river flows through a turbine in a hydroelectric power plant, the potential energy of the water behind the dam changes to 1.chemical energy2.nuclear energy3.mechanical energy4.radiant energy

3

84. A bicycle rider ate breakfast before the ride. Which energy transformation occurred during the bike ride?1.Kinetic to chemical energy2.Chemical to kinetic energy3.Kinetic to nuclear energy4.Nuclear to kinetic energy 2

85. Which of the following increases when a metal spring is stretched horizontally?1.Potential energy2.Kinetic energy3.Chemical energy4.Electrical energy 1

86. A family is moving from Pennsylvania to Connecticut. As the moving van burns gasoline, it converts1. chemical energy into mechanical energy2. kinetic energy into potential energy3. thermal energy into electrical energy4. mechanical energy into kinetic energy

1

87. What happens to the kinetic energy and gravitational potential energy of a ball during free fall?1.GPE and KE both increase.2.GPE and KE both decrease.3.GPE decreases and KE increases.4.GPE increases and KE decreases.

3

88. Which energy source was developed through the invention of the atomic bomb?1.Nuclear2.Geothermal3.Solar4.Hydropower

1

4

89

3

90

2

90

2

91

3

92

2

93

4

94

1

95

Hydrogen and oxygen

96

6

97

2

98