Chapter 9 Practice Paper: Thermal Properties of Matter — question paper (print)

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Secondary 3 · Physics (G2 / G3)

Chapter 9 Practice Paper

Thermal Properties of Matter

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Write your name, class and register number in the spaces at the top of this page.
Answer all questions.
Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
Take the acceleration of free fall g as 10 m/s² unless stated otherwise.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Internal energy, specific heat capacity, melting and boiling, specific latent heat, cooling curves.

For Examiner’s Use
Section A	/ 10
Section B	/ 20
Total	/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

1
While a kettle of water is boiling steadily, the temperature of the water
1. Arises slowly
2. Bfalls slowly
3. Crises sharply then falls
4. Dstays constant
( )
2
The specific heat capacity of a substance is the energy needed to raise the temperature of
1. Aany amount of it by 1 °C
2. B1 kg of it by 1 °C
3. C1 kg of it by any amount
4. Dthe whole body to 100 °C
( )
3
A 2.0 kg block of copper (specific heat capacity 380 J/(kg·°C)) gains 7600 J of energy. Its temperature rises by
1. A0.10 °C
2. B5.0 °C
3. C10 °C
4. D20 °C
( )
4
Wet clothes dry slowly on a cold, humid day because evaporation is slow when the incoming molecules
1. Aare too few in number to escape
2. Breturn to the clothes almost as fast as they leave
3. Chave too much energy
4. Dcondense inside the fabric
( )
5
On a cooling curve of a liquid solidifying in a beaker, the flat (constant-temperature) section shows that
1. Athe beaker has stopped losing energy
2. Bthe particles have stopped moving
3. Cenergy is being released as the particles lock into a lattice, without a temperature fall
4. Dthe thermometer is broken
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1
A 0.60 kg aluminium pan is heated on a cooker. The pan and 2.0 kg of water inside it warm from 20 °C to 100 °C. (Specific heat capacity of aluminium = 900 J/(kg·°C); of water = 4200 J/(kg·°C).)
1. (a)
  Determine the heat energy the water gains.
  energy =J[2]
2. (b)
  Calculate the energy gained by the pan.
  energy =J[2]
3. (c)
  Calculate the total energy supplied, assuming no losses.
  energy =J[1]
4. (d)
  Explain why the cooker actually supplies more than this.
  [2]
2
A 0.020 kg ice cube at 0 °C melts in a warm glass and the resulting water warms to 20 °C. (Specific latent heat of fusion of ice = 3.34 × 10⁵ J/kg; specific heat capacity of water = 4200 J/(kg·°C).)
1. (a)
  Calculate the energy needed to melt the ice.
  energy =J[2]
2. (b)
  Calculate the energy needed to warm the melted water from 0 °C to 20 °C.
  energy =J[2]
3. (c)
  Compare the two answers and comment on what this shows about latent heat.
  [2]
4. (d)
  State why the temperature stayed at 0 °C while the ice melted.
  [1]
3
A student heats a solid, records its temperature every 30 s, and plots the cooling-free heating curve below (described in words): the temperature rises steadily from 20 °C to 55 °C, holds exactly at 55 °C for four readings while the sample slowly melts, then rises again from 55 °C toward 78 °C.
1. (a)
  State the melting point of the substance.
  melting point =°C[1]
2. (b)
  Explain why the temperature stays constant during the four readings.
  [3]
3. (c)
  The final section (55 °C to 78 °C) rises more slowly than the first section (20 °C to 55 °C) for the same heater. Suggest why.
  [2]

— End of paper —