chapter4 enrichment(answer)

7/29/2019 Chapter4 Enrichment(Answer)

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JPN Pahang Physics

Chapter 4: Heat (Teacher) Enrichment Module

ANSWER

Section A

1. C

2. D

3. C

4. C

5. D

6. D

7. B

8. C

9. B

10. B

11. A

12. A

13. C

14. D

15. B

16. A

17. C

18. B

19. C

20. D

21. C

Section B

1

(a)

The quantity of heat energy required to increase the temperature of 1 kg of the substance

by 1 or 1 K

1

(b)(i) The temperature of the soup in the metal pot is higher than the temperature of the soup

in the clay pot.

1

(ii) The specific heat capacity of the metal pot is lower than the specific heat capacity of the

clay pot.

1

(iii) An object with a lower value of specific heat capacity will

increase temperature faster when heated by same amount of energy.

The pot that has a lower specific heat capacity requires less heat to increase the

temperature.

1

1

(iv) The lower the specific heat capacity, the higher the increase in temperature. 1

(c)(i) The temperature of the soup in the metal pot is lower than the temperature of the soup

in the clay pot after 5 minutes move away from the burner.

1

(ii) An object with a lower value of specific heat capacity cools faster due to its

lower amount of heat stored.

1

TOTAL 8

2

(a)

There is no net flow of heat between two objects and they have same temperature 1

(b) 45 0C 1

(c) The heat from block P transfer to the water

Until the rate of heat transfer between P and water become equal

1

1

(d) E = mc

= 0.3 x 900 x 55

= 14 850 J

1

1

TOTAL 63

(a)

Quantity of heat required to change 1 kg of a substance from solid to liquid without any

change in temperature

1

(b) i) Cup B 1

ii) The ice is exposed to the surroundings 1

The ice absorb heat from the surroundings 1

(c) Heat released = 0.2 x 4500 x (75.5 - 25) 1

45450 J 1

(d) i) mi x 3.36 x 105 + mi x 4200 (25 0) 1

mi x 3.36 x 105 + mi x 4200 (25 0) = 45450 1

0.103 kg 1

ii) No heat loss from the coffee to surroundings 1

TOTAL 10

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4 (a)

(i)

(ii)

h2greater // vice versa

Temperature in Diagram 4.1 is lesser // vice versa

1

1

(b) When the temperature increase, the hieght also increase

When the temperature increase, the distance between molecules also increase

When the distance between molecules increase, the volume also increase

1

1

1(c) Charles Law 1

(d) h1 increases 1

(e) When force//pressure applied is decreases, the volume is increases at constant

temperature

1

TOTAL 10

Section C

Question 1

Part Mark Scheme Notes

(a) 1 Degree of hotness of a substance(b)

1

2

3

4

5

Menyatakan perubahan suhu dengan tenaga

Pada keadaan pepejal suhu bertambah jika tenaga

bertambah

Pada keadaan cecair, suhu bertamabh jika tenaga

bertambah

Menyatakan hubungan antara suhu takat lebur

dengan tenaga dan penjelasan haba pendam

Suhu tak berubah dengan pertambahan tenaga pada

takat lebur

Tenaga haba digunakan untuk meleburkan

pepejal/menukarkan pepejal kepada cecair/ Tenaga

digunakan untuk meleraikan ikatan molkeul pepejal

kepada cecair

Tenaga haba ini dinamakan haba pendam pelakuran

(c)

1

2

3

4

Menyatakan kaedah yang sesuai

Masukkan ais ke dalam air kopi

Kacau campuran ais dan air kopi

Menjelaskan kepentingan kaedah

Menyerap haba dari air kopi

Haba dari air kopi dipindahkan lebih cepat dengan

mengacau

Terima lain-lain

kaedah yang sesuai

(d)

1

2

3

4

5

Menyatakan binaan paip dan penjelasankepentingannya

Paip dibina berbentuk gelung mengelilingi kotak

pembeku

Supaya cecair penyejuk dapat menyerap haba lebih

besar

Menyatakan jenis bahan paip yang digunakan dan

penjelasan pemilihan jenis bahan.

Dibuat dari bahan yang mempunyai muatan haba

tentu rendah

Supaya dapat menyerap haba lebih cepat /pengalir

haba yang baik

Menyatakan jenis cecair yang sesuai danpenjelasan

Terima semuacadangan ubahsuaian

yang sesuai

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6

7 &8

9

10

Cecair Freon

Ia mudah mengembang menjadi wap pada suhu dan

tekanan rendah

Menyatakan ciri-ciri Keselamatan dan penjelasan

Kotak hendaklah dibalut dengan bahan penebat

Untuk mengelakkan renjatan jika berlaku kebocoran

arus

Pasangkan thermostat

Supaya suhu dalam peti dikawal

Menyatakan kedududukkan kotak dingin beku

Kotak pembeku diletakkan di bahagian atas peti

sejuk

Menyatakan perolakan udara dalam peti sejuk

Udara sejuk di bahagian atas akan turun ke bawah

/pergerakan udara panas dan sejuk

Jum 20

2. (a) (i) Thermal equilibrium states that the net rate of heat flow from one medium to

another medium and vice versa is zero// temperature for both medium is the same.

1

(ii) - Place the thermometer under the tongue

- Heat transfer from the body to the mercury

- The temperature rises // length of mercury increases

- When the equilibrium state is achieves take the reading of thermometer.

1

1

1

1

(b) (i) 100 C 1

(ii) Heat supplied by metal block = heat gained by the water //m 1 c1 1 = m 2 c2 2

0.25 x 900 x (100 ) = 0.5 x 4200 ( -29)

= 27.74 C

1

1

1

(iii) No heat loss to the surrounding 1

(c) Aspect Explanation

Large numbers of fin blade - Increase surface area // release

heat quickly // engine cools

quickly

Big size of fan Can suck more air // more air

can be blow to the engineHigh boiling point Not easily to vaporize // the

volume of liquid reduce

slowly // takes a longer time to

boil

High specific heat capacity Takes a longer time to become

hot // the rise in temperature is

slow

S is chosen Large numbers of fin

blade,big size of fan, high

boiling point, high specific

heat capacity

10Total 20

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Section D

Question 1 Marks Answer

(a)(i) 1 V is directly proportional to T // V T

(ii) 1

1

Show on graph with appropriate vertical and/or horizontal linecorresponding to 200 K.

37 mm3

(b)(i) 3 1. Drawing the gradient triangle

Triangle size a minumum of 4 x 3

2. Substitution

(values from students triangle)

3. Jawapan dengan unit betul

0.1833 mm3 K- 1 ( Accept answers from 2 to 4 decimal places )

(ii) 3 1. Explaining your working

V = gradient x 3752. Substitution

V = (0.1833) x 375

3. Jawapan dengan unit betul

68.74 mm3

(c) 1

1

1

Show on graph with appropriate vertical and/or horizontal line

corresponding to 55 mm3

300 K

27 oC

JUMLAH 12

Question

Number

Answer Full

Mark

2 (a) The volume of the snack pack influenced by / effected by / depends on the

atmospheric pressure of the surrounding. 1

(b) For a fixed mass and at constant temperature of a gas, its volume

will increase when the pressure decreases.

or

The volume of a gas increases when the pressure decreases.

1

(c)(i)

To investigate the relationship between the volume and the pressure

of a gas at fixed mass and temperature.

1

(ii) Manipulated variable :Volume of a gas, V

Responding variable :Gas pressure,P

Constant variable :Gas temperature,T / mass of a gas,m

1

1

(iii)

Bourdon gauge, a syringe with volume scale and rubber tube1

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(iv)

1

(v)

1. The piston of the syringe is pressed down slowly until the volumeof air inside is 120 cm3.

2. The pressure of the air in the syringe is read from the Bourdon

gauge.

3. The experiment is repeated with volume of air inside the syringe

at 100 cm3, 80 cm3 , 60 cm3 , 40 cm3 and 20 cm3.

1

1

1

(vi)

Volume , V / cm3 Pressure , P /Pa

120

100

80

60

40

1

(vii)

1

TOTAL

12

5

Volume, V/cm3

Pressure, P/Pa

chapter4 enrichment(answer)

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