SOALAN AMALI HBSC3403 (1)

7/27/2019 SOALAN AMALI HBSC3403 (1)

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SEMESTER SEPTEMBER 2011

EXPERIMENTSFOR

TEACHING SCIENCE FOR LOWER

SECONDARY 11

(HBSC3403)

(20%)

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EXPERIMENT1

Aim: To show that air exerts pressure

Materials and apparatus: glass of water, cardboard

Procedure:-

1. Fill the water into the glass until it is full.

2. Place a cardboard on the brim of the glass.

3. With one hand supporting the cardboard and the other hand supporting the

glass, tilt the glass.(Figure 1)

4. Slowly, remove the hand supporting the cardboard.

5. Observe what happens.

6. Explain your observation.

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EXPERIMENT2

Aim: To show the effects of air pressure

Materials and apparatus: mahjong paper, marker pens

Procedure:-

1. Divide into groups of four and divide a chart using the mahjong paper into

two parts.

2. Label one side Air pressure helps and the other Air pressure hinders.

3. Brainstorm 5 ways in which air pressure helps people. Look out for 5

instances where air pressure hinders people.

4. Record the ideas on the chart.

5. Add these to the chart.

EXPERIMENT3

Aim: To show that air contains water vapour

Materials and apparatus: Retort stand, test tube, ice cubes, stoppers, crucible,tissue paper, cobalt chloride paper

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Figure 2


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Procedure:-

1. Fill a test tube with ice cubes.

2. Close the test tubes with a stopper.3. Clamp the test tube to a retort stand.

4. Place the crucible on the surface of the retort stand below the test tube

(Figure 2).

5. Wipe the outer surface of the test tube with tissue paper.

6. Leave the test tubes for a few minutes.

7. Observe what happens.

8. Carry out a test to confirm the fluid collected at the crucible.


EXPERIMENT4

Aim: An experiment to show that there is microorganism in the air.

Materials and apparatus: Two petri dishes, sterilized nutrient agar.

Procedures:

1. Take two petri dishes; one with a cover and the other without a cover.

2. Pour sterilized nutrient agar into the two petri dishes.

3. Leave both petri dishes in the laboratory.

4. After three days, check the nutrient agar with a magnifying glass.

5. Draw the appearance of what is observed in the petri dish without the cover.

6. Explain your observation of the two petri dishes.

EXPERIMENT5

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Aim: To separate the components of a mixture through filtration

Materials and apparatus: test tube, filter funnel, filter paper, test tube containing

chalk and water suspension.

Procedures:

1. Line the filter funnel with

the filter paper.

2. Place the filter funnel into an empty test-tube.

3. Pour the chalk and water suspension into the filter funnel (Figure 3).

4. Observe what happens. Name the residue and the filtrate.

EXPERIMENT6

Aim: To identify things made from animal or plant products.

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Figure 3


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Materials and apparatus: Things found in the laboratory

Procedures:

1. Look around you and identify 10 things found in the laboratory.2. List the things down and identify whether the things are made from plant or

animal.

ITEMS FROM ANIMALS ORANIMAL PRODUCTS

ITEMS FROM PLANT OR PLANTPRODUCTS

3. Record your observation in the table given. Give your opinion as to whether

the things found in the laboratory have depleted the resources of the Earth.

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EXPERIMENT7

Aim: To find out the air pollution level at your place.

Materials and apparatus: Readings of the API from

http://www.doe.gov.my/apims/lokasi.php

Procedures:

1. Write down the API index of your area for two weeks.

2. Fill in the data in the table given below.

Date of API taken API

3. From the data recorded, state your opinion as to the degree of pollution in

your area for that week.

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http://www.doe.gov.my/apims/lokasi.phphttp://www.doe.gov.my/apims/lokasi.php


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EXPERIMENT8

Aim: To show the products of respiration

Materials and apparatus: Bunsen burner, deflagrating spoon, oxygen, cobalt

chloride paper, limewater, glucose, gas jar with cover

Procedure:

1. Place some glucose on the deflagrating spoon.

2. Heat the sugar over the Bunsen burner until it burns.

3. Transfer the deflagrating spoon and its contents into a gas jar filled with

oxygen (Figure 4).

4. Wait until the glucose has burnt completely.5. Touch the walls of the gas jar. Record your observation.

6. Observe the interior of the gas jar. Record your observation.

7. Slide the cobalt chloride paper on the inner walls of the gas jar. Record

your observation of the cobalt chloride paper.

8. Pour a bit of limewater into the gas jar and shake it. Record your

observation of the limewater.

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Figure 4


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9. Write a conclusion of this experiment.

EXPERIMENT9

Aim: To find the products of combustion of a candle.

Materials and apparatus: gas jar, gas jar lid, candle, cobalt chloride paper,

limewater and matches

Procedure:

1. Light up the candle. Let it stand on the gas jar lid .(Figure 5)

2. Invert the gas jar over the lighted candle.

3. When the candle blows out, observe the inner linings of the gas jar for the

presence of any substances.

4. Use the cobalt chloride paper to test the substance.

5. Record your observation.

6. Repeat step 1 and step 2.7. After the candle blows off, invert the gas jar and pour 2cm3 of limewater

and shake the gas jar.

8. Record your observation.


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Figure 5


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EXPERIMENT10

Aim: To calculate power.

Materials and apparatus: measuring tape, stop watch, weighing machine

Procedure:

1. Weigh yourself using a weighing machine.

2. Choose a flight of stairs nearby and measure the vertical height of the

stairs with a measuring tape.

3. Get a partner to record the time taken for you to reach the top of the

stairs.

4. Walk quickly to the top of the stairs.5. Repeat steps 3 and 4 with three other people.

6. Record all the observations in the table below.

Name Weight of the

person (N)

Height of the stairs (M) Time (s) Power (W)

=Work done (J)

Time taken (s)

1. Calculate the power for each person to go up the flight of stairs.

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SOALAN AMALI HBSC3403 (1)

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