Phase Change Lab - A science lab experiment with pre-post evaluations and results. Can be used PDF

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Summary

A science lab experiment with pre-post evaluations and results.
Can be used by anyone looking at science, biology, and phase changes....

Description

Physical Science

Name: T.M.

Partner: None

Phase Change Lab

Hr: 4

Date: 1.28.20

------Materials ●

Thermometer

●

Hot plate

●

Large beaker (500ml)

●

Ice

--Background: 1.

Find a phase change diagram for water.

a. 2.

The diagram is shown above.

List the physical properties of water. Why is water unique? a.

Cohesion/Surface Tension, Conduction of Heat, Latent Heat of Vaporization + Fusion, Heat Capacity, Density, and Viscosity

b. 3.

It’s composition, unusual properties, and importance to human life.

Why is water called the “universal solvent”? a.

Because it’s capable of dissolving a variety of different substances

--Procedure 1.

Fill the beaker with ⅓ of ice.

2.

Add water until the ice is covered.

3.

Add 5g of sugar.

4.

Record the temperature of the liquid in the table.

5.

Heat the beaker.

6.

Record the temperature of the liquid every 30 seconds.

 7.

Record observations of the water/mixture every 30 seconds.

8.

Turn off the hot plate after 2 minutes.

9.

Graph results on a piece of graph paper.

--Data Table Time (s)

Temp (C)

Observations

0

4

In its original ice-water form.

30

5

60

8

90

8

120

8

150

6

180

8

210

9

240

10

270

12

300

13

330

14

360

14

390

15

About half of the ice is melted.

420

16

¾ melted

450

17

⅘ melted

480

18

510

20

540

24

570

25

Ice is beginning to melt.

Ice is continuing to melt.

Most of the ice is melted.



600

30

630

32

660

35

690

39

720

43

750

45

780

48

810

51

840

54

870

57

900

59

930

62

960

64

990

66

1020

68

1050

70

1080

72

2010

75

2040

76

2070

78

2100

80

2130

81

2160

82

2190

83

2200

85

Ice is gone



2230

86

2260

87

2290

88

2320

89

2350

90

2380

90

2410

91

2440

92

2480

92

2510

92

2540

93

2570

93

2600

94

2630

94

2660

94

2690

95

2720

95

2750

95

2780

96

2810

97

2840

97

2870

97

2900

97

2930

97

2960

97



2990

98

3020

98

3050

99

3080

99

3100

99

3130

99

3160

99

3190

100

3220

100

3250

100

3280

100

Lots of Bubbles

3310

101

Data Complete

---

Boiling Point

 Graphs



Analysis 1.

What happened to the temperature of the water as the ice melted? As the water boils? a.

As the ice was melting - at certain points - the water would temp would decrease slightly because the ice would make it cooler.

b. 2.

Where do you think that the energy from the burner was going? a.

3.

When the water boiled, the temperature increased.

It traveled around the beaker glass, through the water, and created steam.

Did the dissolved substances change the physical properties of the water? Explain. a.

The dissolved substances gave the water a slightly different color and appearance. The salt made it take longer for the ice to melt. The sugar and salt made it take less time for the water to start boiling.

4.

What is the melting point of the solution? a.

5.

What is the boiling point of the solution? a.

6.

Salt: 10-15 minutes, Sugar: 10-14 minutes, Water: 11-15 minutes

Identify the segment(s) on your graphs where gas is present? a.

9.

Salt: 0-6 minutes, Sugar: 0-10 minutes, Water: 0-10.30 minutes

Identify the segment(s) on your graphs a liquid is present only? a.

8.

(In Celsius) || Salt: 102, Sugar: 100, Water: 100

Identify the segment(s) on your graphs where a solid is present? a.

7.

(In Celsius) || Salt: 23, Sugar: 23, and Water: 32.

Salt: 15-21 minutes, Sugar: 14-32 minutes, Water: 15-41 minutes

Identify segments on your graphs which indicate phase changes are taking place.

 a.

Salt: solid (0-6 minutes) liquid (10-15 minutes) gas (15-21 minutes

b.

Sugar: solid (0-10 minutes) liquid (10-14 minutes) gas (14-32 minutes)

c.

Water: solid (0-10.30 minutes) liquid (11-15 minutes) gas (15-41 minutes)...