Chapter 7 Heat
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Form 1 Science Chapter 7
FORM 1 CHAPTER 7 HEAT
1. Diagram 1.1 shows the physical changes in the state of water. Ice X : …………………..…..
Steam
Process Z Y : …………………..….. Diagram 1.1
(a) Name processes X and Y in Diagram 1.1 using the following words Melting
Boiling
Condensation [2 marks]
(b) Diagram 1.2 shows the drying of clothes under the sun.
Diagram 1.2
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Form 1 Science Chapter 7
(i) Name the physical process shown in Diagram 2.1. …………………………………………………………………………………………………… [1 mark] (ii) Draw the changes in the arrangement of particles during this process.
[2 marks] (iii) State whether heat is absorbed or released during this process. ……………………………………………………………………………………………………. [1 mark]
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Form 1 Science Chapter 7
2. Diagram 2.1 shows an activity involving different ways of heat flow from a fire. Y : …………………………….
X : ………………………………
Z : …………………………
Diagram 2.1 (a) State the ways of heat flow in Diagram 2.1 using the following information. Radiation
Convection
Conduction [2 marks]
(b) Draw the direction of heat flow from the hot pot to the hand in the box provided in Diagram 2.2
Diagram 2.2 [1 mark]
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Form 1 Science Chapter 7
(c) Diagram 2.3 shows an electric kettle that functions using the principle of heat transfer.
X
Diagram 2.3
(i)
State the function of X. ……….…………………………………………………………………………………………. [1 mark]
(ii)
Draw arrows to show the convection current that occur in the kettle in the box in Diagram 2.3. [1 mark]
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Form 1 Science Chapter 7
3. Diagram 3.1 shows an activity that is carried out to study the effect of heating on a metal ball. ring ring metal ball metal ball
After Heating
Before Heating Diagram 3.1
(a) What can be observed when the heated metal ball is placed on the ring?
………………………………………………………………………………………………… [1 mark] (b) What is the effect of heat on the metal ball? …………………………………………………………………………………………………………. [1 mark] (c) What happens to the particles in the metal ball when the metal ball is heated?
…………………………………………………………………………………… …. ……… [1 mark] (d) Draw the changes in arrangement of particles when the metal ball is heated.
Before Heating
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After Heating
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Form 1 Science Chapter 7
[1 mark] (e) Diagram 3.2 shows the effect of heat on the bimetallic strip Metal P
Metal Q Before heating
After heating Diagram 3.2
(i) Why does the metallic strip bend after heating?
………………………………………………………………………………….………….. ……………………………………………………………………………………………… [1 mark] (ii) Diagram 3.3 shows bimetallic strip used in a fire alarm. Label P and Q in the boxes provided so that fire alarm system can function.
Contact point
Emergency light Contact screw
Fire alarm rings Power supply Diagram 3.3 (iii) What causes the alarm to ring when the bimetallic strip bends? ……………………………………………………………………………………………………..
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Form 1 Science Chapter 7
[1 mark] 4. (a) Diagram 4.1 shows two shirts of different colours which are being dried under the same conditions.
Black shirt
White shirt
Situation B
Situation A Diagram 4.1
(i)
Based on your observations in Figure 8.1, state the difference in the time taken for the shirts to dry in Situation A and Situation B. … ………………………………………………………………………………………………… …………………………………………………………………………………………………… [1 mark]
(ii)
What inference can be made based on Situation A and Situation B in Diagram 4.1? …….. ……………………………………………………………………………………………..
……………………………………………………………………………….. ……………………. [1 mark]
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Form 1 Science Chapter 7
(b) Diagram 4.2 shows an experiment to study the absorption of heat by different surfaces. The apparatus is being heated for 5 minutes and the thermometer reading in each minute is recorded in the table 4.3 below. The final thermometer reading is shown.
40
35
Diagram 4.2 Time of heating,
Reading of thermometer X
Reading of thermometer Y
t (minutes)
T, (°C)
T, (°C)
0
35
35
1
36
35
2
38
36
3
40
36
4
42
37
5 Table 4.3 (i) State the following variables. Controlled variable : …………………………………………………………………………. Manipulated variable: ………………………………………………………………………… Responding variable: ……………………………………………………………………….. [3 marks]
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Form 1 Science Chapter 7
(ii) State the hypothesis of this experiment. …………....................................................................................................................... …………..…………………………………………………………………………….. ……… [1 mark] (iii) Record the temperature reading in the table 4.3. [1 mark] (iv) Based on the information in Table 4.3, plot a graph to show the relationship between the time of heating, t and the thermometer reading. [2 marks]
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Form 1 Science Chapter 7
(v) Based on the graph, what is the relationship between the time, t and the temperature, T? …………………………………………………………………………………………………. …………………………………………………………………………………………………. [1 mark]
(vi)
Predict what will happen to the thermometer X reading after 5 minutes. ………………………………………………………………………………………………… ………………………………………………………………………………………………… [1 mark]
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Form 1 Science Chapter 7
5.
Diagram 5.1 shows an activity to compare the heat conductivity of three different metal rods, P, Q and R. Rod P Rod Q Rod R Wax Thumbtack
Diagram 5.1 The rods are heated equally at one end. The time taken for the thumbtacks to drop is given in Table 5.2. Metal rod P Q R
Time taken for thumbtacks to drop (s) 90 150 110 Table 5.2
(a) How is heat transferred through the metal rods? ………………………………………………………………………………………………………. [1 mark] (b) (i) Which metal rod transfer heat the fastest? …………………………………………………………………………………………………… [1 mark] (ii) Explain your answer in (b)(i). …………………………………………………………………………………………………. [1 mark] (c) Arrange P, Q and R according to their heat conductivity in ascending order. ………………………………………………………………………………………………………. [1 mark]
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Form 1 Science Chapter 7
(d) (i) Which of the metals, P, Q, or R is the best material for making a frying pan? …………………………………………………………………………………………………. [1 mark] (ii) Give one reason for your answer in (d)(i). …………………………………………………………………………………………………… …………………………. ………………………………………………………………………. [1 mark]
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FORM 1 CHAPTER 7 HEAT
1. Diagram 1.1 shows the physical changes in the state of water. Ice X : …………………..…..
Steam
Process Z Y : …………………..….. Diagram 1.1
(a) Name processes X and Y in Diagram 1.1 using the following words Melting
Boiling
Condensation [2 marks]
(b) Diagram 1.2 shows the drying of clothes under the sun.
Diagram 1.2
JPN Pahang 2009
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Form 1 Science Chapter 7
(i) Name the physical process shown in Diagram 2.1. …………………………………………………………………………………………………… [1 mark] (ii) Draw the changes in the arrangement of particles during this process.
[2 marks] (iii) State whether heat is absorbed or released during this process. ……………………………………………………………………………………………………. [1 mark]
JPN Pahang 2009
49
Form 1 Science Chapter 7
2. Diagram 2.1 shows an activity involving different ways of heat flow from a fire. Y : …………………………….
X : ………………………………
Z : …………………………
Diagram 2.1 (a) State the ways of heat flow in Diagram 2.1 using the following information. Radiation
Convection
Conduction [2 marks]
(b) Draw the direction of heat flow from the hot pot to the hand in the box provided in Diagram 2.2
Diagram 2.2 [1 mark]
JPN Pahang 2009
50
Form 1 Science Chapter 7
(c) Diagram 2.3 shows an electric kettle that functions using the principle of heat transfer.
X
Diagram 2.3
(i)
State the function of X. ……….…………………………………………………………………………………………. [1 mark]
(ii)
Draw arrows to show the convection current that occur in the kettle in the box in Diagram 2.3. [1 mark]
JPN Pahang 2009
51
Form 1 Science Chapter 7
3. Diagram 3.1 shows an activity that is carried out to study the effect of heating on a metal ball. ring ring metal ball metal ball
After Heating
Before Heating Diagram 3.1
(a) What can be observed when the heated metal ball is placed on the ring?
………………………………………………………………………………………………… [1 mark] (b) What is the effect of heat on the metal ball? …………………………………………………………………………………………………………. [1 mark] (c) What happens to the particles in the metal ball when the metal ball is heated?
…………………………………………………………………………………… …. ……… [1 mark] (d) Draw the changes in arrangement of particles when the metal ball is heated.
Before Heating
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After Heating
52
Form 1 Science Chapter 7
[1 mark] (e) Diagram 3.2 shows the effect of heat on the bimetallic strip Metal P
Metal Q Before heating
After heating Diagram 3.2
(i) Why does the metallic strip bend after heating?
………………………………………………………………………………….………….. ……………………………………………………………………………………………… [1 mark] (ii) Diagram 3.3 shows bimetallic strip used in a fire alarm. Label P and Q in the boxes provided so that fire alarm system can function.
Contact point
Emergency light Contact screw
Fire alarm rings Power supply Diagram 3.3 (iii) What causes the alarm to ring when the bimetallic strip bends? ……………………………………………………………………………………………………..
JPN Pahang 2009
53
Form 1 Science Chapter 7
[1 mark] 4. (a) Diagram 4.1 shows two shirts of different colours which are being dried under the same conditions.
Black shirt
White shirt
Situation B
Situation A Diagram 4.1
(i)
Based on your observations in Figure 8.1, state the difference in the time taken for the shirts to dry in Situation A and Situation B. … ………………………………………………………………………………………………… …………………………………………………………………………………………………… [1 mark]
(ii)
What inference can be made based on Situation A and Situation B in Diagram 4.1? …….. ……………………………………………………………………………………………..
……………………………………………………………………………….. ……………………. [1 mark]
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Form 1 Science Chapter 7
(b) Diagram 4.2 shows an experiment to study the absorption of heat by different surfaces. The apparatus is being heated for 5 minutes and the thermometer reading in each minute is recorded in the table 4.3 below. The final thermometer reading is shown.
40
35
Diagram 4.2 Time of heating,
Reading of thermometer X
Reading of thermometer Y
t (minutes)
T, (°C)
T, (°C)
0
35
35
1
36
35
2
38
36
3
40
36
4
42
37
5 Table 4.3 (i) State the following variables. Controlled variable : …………………………………………………………………………. Manipulated variable: ………………………………………………………………………… Responding variable: ……………………………………………………………………….. [3 marks]
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Form 1 Science Chapter 7
(ii) State the hypothesis of this experiment. …………....................................................................................................................... …………..…………………………………………………………………………….. ……… [1 mark] (iii) Record the temperature reading in the table 4.3. [1 mark] (iv) Based on the information in Table 4.3, plot a graph to show the relationship between the time of heating, t and the thermometer reading. [2 marks]
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Form 1 Science Chapter 7
(v) Based on the graph, what is the relationship between the time, t and the temperature, T? …………………………………………………………………………………………………. …………………………………………………………………………………………………. [1 mark]
(vi)
Predict what will happen to the thermometer X reading after 5 minutes. ………………………………………………………………………………………………… ………………………………………………………………………………………………… [1 mark]
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Form 1 Science Chapter 7
5.
Diagram 5.1 shows an activity to compare the heat conductivity of three different metal rods, P, Q and R. Rod P Rod Q Rod R Wax Thumbtack
Diagram 5.1 The rods are heated equally at one end. The time taken for the thumbtacks to drop is given in Table 5.2. Metal rod P Q R
Time taken for thumbtacks to drop (s) 90 150 110 Table 5.2
(a) How is heat transferred through the metal rods? ………………………………………………………………………………………………………. [1 mark] (b) (i) Which metal rod transfer heat the fastest? …………………………………………………………………………………………………… [1 mark] (ii) Explain your answer in (b)(i). …………………………………………………………………………………………………. [1 mark] (c) Arrange P, Q and R according to their heat conductivity in ascending order. ………………………………………………………………………………………………………. [1 mark]
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Form 1 Science Chapter 7
(d) (i) Which of the metals, P, Q, or R is the best material for making a frying pan? …………………………………………………………………………………………………. [1 mark] (ii) Give one reason for your answer in (d)(i). …………………………………………………………………………………………………… …………………………. ………………………………………………………………………. [1 mark]
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