Chapter 5 Air Around Us
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Form 1 Science Chapter 5
FORM 1 CHAPTER 5 AIR AROUND US 1. Diagram 1.1 shows the percentages of gases found in the air.
1% Q: ………………………..
P: ………………………….
0.03%
21% R: …………………………….
78%
Diagram 1.1 (a) Label gas P, Q and R on the Diagram 1. [3 marks] (b) Give one use of (i)
gas Q : …………………………………………………………………………………… …….
(ii)
gas R : …………………………………………………………………………………… ……. [2 marks]
Gas
Glowing wooden splinter
Gas
Diagram 1.2 (c) Diagram 1.2 shows a test on a gas. Which of the following gases, P, Q or R will show the results as shown in Diagram 1.2? ……………………………………………………………………………………………………… [1 mark]
JPN Pahang 2009
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Form 1 Science Chapter 5
2. Diagram 2 shows some ice cubes in a beaker. The beaker was left at room temperature. After a while, X is formed on the outer wall of the beaker.
Evaporating dish X Beaker Ice cubes Diagram 2 (a) What is X? ………………………………………………………………………………………………………. [1 mark] (b) How do you test for X? ………………………………………………………………………………………………………. [1 mark] (c) Where does X come from? ……………………………………………………………………………………………………… [1 mark] (d) Explain how X is formed. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [2 marks] (e) What can you conclude from this activity? ……………………………………………………………………………………………………… [1 mark]
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Form 1 Science Chapter 5
3. (a) Diagram 3.1 shows two candles which were lit in two different containers
Situation A
Situation B
Diagram 3.1 (i)
Based on your observations in Diagram 3.1, state the difference in the time taken for the candle to burn in Situation A and Situation B. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [1 mark]
(ii)
What inference can be made based on Situation A and Situation B in Diagram 3.1. ……………………………………………………………………………………… …………….. ….…………………………………………………………………………………………………. [1 mark]
(iii)
State one hypothesis based on your observations in Diagram 3.1.
………………………………………………………………………………………………………. …………………………………………………………………………………………… …………. [1 mark] (b) A student carried out an experiment to investigate Situation A and Situation B. Diagram 3.2 shows an experiment to determine how the volume of air affects the time taken for the candle to burn.
Beaker P (250 mℓ)
JPN Pahang 2009 Beginning
33
End
Form 1 Science Chapter 5
Beaker Q (500 mℓ)
End
Beginning Beaker R (1000 mℓ)
End
Beginning
Diagram Time taken for candle to burn (s) 3.2 (i) Based on Diagram 3.2 record the time taken for the candles to burn in Table 3.3. Beaker P Q R
Time taken for candle to burn (s)
Table 3.3 [3 marks]
(ii) Based on the readings in Table 3.3, draw a bar chart to show the time taken for the candle to burn in different containers.
JPN Pahang 2009
34 0
P
Q
R
Beaker
Form 1 Science Chapter 5
[2 marks] (c) State the variables involved in this experiment.
Manipulated variable Responding variable Constant variable [3 marks] (d) Based on the experiment, state the relationship between the volume of air and the time taken for the candle to burn. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [1 mark] 4. Diagram 4 shows the combustion of aXcandle. Filter funnel Limewater
JPN Pahang 2009
35 Candle Diagram 4
Form 1 Science Chapter 5
(a)(i) What can be observed about the limewater after a while? …………………………………………………………………………………………………………… [1 mark] (ii) Name the gas that causes the change in (a)(i). …………………………………………………………………………………………………………. [1 mark] (b)(i) After the candle has extinguished, X is formed on the inner surface of the filter funnel. What can be observed when X is tested with anhydrous cobalt chloride paper? ………………………………………………………………………………………………………… …. [1 mark] (ii) From your observations in (b)(i), what can you conclude about X? ………………………………………………………………………………………………………… …. [1 mark] (c) Candle is a compound. From the results, what are the elements found in candle? ……………………………………………………………………………………………………………. [1 mark] (d) Write an equation in words to show the combustion of candle.
+ JPN Pahang 2009
+
+
36
Heat energy
+
Light energy
Form 1 Science Chapter 5
[2 marks]
Q
P Inhaled air
Burning candle
Exhaled air
Measuring cylinder 5. Diagram 5 shows an activity to compare the content of oxygen in inhaled air and exhaled air. Cork
JPN Pahang 2009
37Water Diagram 5
Form 1 Science Chapter 5
(a) (i) Which candle will burn for a longer time? …………………………………………………………………………………………………… [1 mark] (ii) Explain your answer in (a)(i) ………………………………………………………………………………………………….. [1 mark] (b) (i) During the burning of the candle, which component of the air does not change in volume? …………………………………………………………………………………………………… [1 mark] (ii) Give one reason for your answer in (b)(i). ........................................................................................................................................ [1 mark] (c) During the haze, the Air Pollutant Index is above 500 which is a sign that the air is bad for health. (i)
State one human activity that causes the haze. ....................................................................................................................................... [1 mark]
(ii)
Suggest what you should do if you have to go out of your house during the haze. …………………………………………………………………………………………………..
JPN Pahang 2009
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Form 1 Science Chapter 5
[1 mark]
JPN Pahang 2009
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FORM 1 CHAPTER 5 AIR AROUND US 1. Diagram 1.1 shows the percentages of gases found in the air.
1% Q: ………………………..
P: ………………………….
0.03%
21% R: …………………………….
78%
Diagram 1.1 (a) Label gas P, Q and R on the Diagram 1. [3 marks] (b) Give one use of (i)
gas Q : …………………………………………………………………………………… …….
(ii)
gas R : …………………………………………………………………………………… ……. [2 marks]
Gas
Glowing wooden splinter
Gas
Diagram 1.2 (c) Diagram 1.2 shows a test on a gas. Which of the following gases, P, Q or R will show the results as shown in Diagram 1.2? ……………………………………………………………………………………………………… [1 mark]
JPN Pahang 2009
31
Form 1 Science Chapter 5
2. Diagram 2 shows some ice cubes in a beaker. The beaker was left at room temperature. After a while, X is formed on the outer wall of the beaker.
Evaporating dish X Beaker Ice cubes Diagram 2 (a) What is X? ………………………………………………………………………………………………………. [1 mark] (b) How do you test for X? ………………………………………………………………………………………………………. [1 mark] (c) Where does X come from? ……………………………………………………………………………………………………… [1 mark] (d) Explain how X is formed. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [2 marks] (e) What can you conclude from this activity? ……………………………………………………………………………………………………… [1 mark]
JPN Pahang 2009
32
Form 1 Science Chapter 5
3. (a) Diagram 3.1 shows two candles which were lit in two different containers
Situation A
Situation B
Diagram 3.1 (i)
Based on your observations in Diagram 3.1, state the difference in the time taken for the candle to burn in Situation A and Situation B. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [1 mark]
(ii)
What inference can be made based on Situation A and Situation B in Diagram 3.1. ……………………………………………………………………………………… …………….. ….…………………………………………………………………………………………………. [1 mark]
(iii)
State one hypothesis based on your observations in Diagram 3.1.
………………………………………………………………………………………………………. …………………………………………………………………………………………… …………. [1 mark] (b) A student carried out an experiment to investigate Situation A and Situation B. Diagram 3.2 shows an experiment to determine how the volume of air affects the time taken for the candle to burn.
Beaker P (250 mℓ)
JPN Pahang 2009 Beginning
33
End
Form 1 Science Chapter 5
Beaker Q (500 mℓ)
End
Beginning Beaker R (1000 mℓ)
End
Beginning
Diagram Time taken for candle to burn (s) 3.2 (i) Based on Diagram 3.2 record the time taken for the candles to burn in Table 3.3. Beaker P Q R
Time taken for candle to burn (s)
Table 3.3 [3 marks]
(ii) Based on the readings in Table 3.3, draw a bar chart to show the time taken for the candle to burn in different containers.
JPN Pahang 2009
34 0
P
Q
R
Beaker
Form 1 Science Chapter 5
[2 marks] (c) State the variables involved in this experiment.
Manipulated variable Responding variable Constant variable [3 marks] (d) Based on the experiment, state the relationship between the volume of air and the time taken for the candle to burn. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… [1 mark] 4. Diagram 4 shows the combustion of aXcandle. Filter funnel Limewater
JPN Pahang 2009
35 Candle Diagram 4
Form 1 Science Chapter 5
(a)(i) What can be observed about the limewater after a while? …………………………………………………………………………………………………………… [1 mark] (ii) Name the gas that causes the change in (a)(i). …………………………………………………………………………………………………………. [1 mark] (b)(i) After the candle has extinguished, X is formed on the inner surface of the filter funnel. What can be observed when X is tested with anhydrous cobalt chloride paper? ………………………………………………………………………………………………………… …. [1 mark] (ii) From your observations in (b)(i), what can you conclude about X? ………………………………………………………………………………………………………… …. [1 mark] (c) Candle is a compound. From the results, what are the elements found in candle? ……………………………………………………………………………………………………………. [1 mark] (d) Write an equation in words to show the combustion of candle.
+ JPN Pahang 2009
+
+
36
Heat energy
+
Light energy
Form 1 Science Chapter 5
[2 marks]
Q
P Inhaled air
Burning candle
Exhaled air
Measuring cylinder 5. Diagram 5 shows an activity to compare the content of oxygen in inhaled air and exhaled air. Cork
JPN Pahang 2009
37Water Diagram 5
Form 1 Science Chapter 5
(a) (i) Which candle will burn for a longer time? …………………………………………………………………………………………………… [1 mark] (ii) Explain your answer in (a)(i) ………………………………………………………………………………………………….. [1 mark] (b) (i) During the burning of the candle, which component of the air does not change in volume? …………………………………………………………………………………………………… [1 mark] (ii) Give one reason for your answer in (b)(i). ........................................................................................................................................ [1 mark] (c) During the haze, the Air Pollutant Index is above 500 which is a sign that the air is bad for health. (i)
State one human activity that causes the haze. ....................................................................................................................................... [1 mark]
(ii)
Suggest what you should do if you have to go out of your house during the haze. …………………………………………………………………………………………………..
JPN Pahang 2009
38
Form 1 Science Chapter 5
[1 mark]
JPN Pahang 2009
39
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