Chapter 2 Practice Paper: Kinetic Particle Theory — question paper (print)

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Secondary 3 · Chemistry (G2 / G3)

Chapter 2 Practice Paper

Kinetic Particle Theory

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.
Chemical equations should be balanced, with state symbols shown where the question asks for them.
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 shown on its cover.

Original practice material written for the MOE Chemistry syllabus. It is not an official MOE or school examination paper. Chapter 2 (states of matter, changes of state, heating and cooling curves, diffusion).

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
Which row describes the particles in a liquid?
1. Afar apart, moving fast and randomly
2. Btouching, sliding past one another
3. Cfixed in a regular lattice, vibrating only
4. Dnot moving at all
( )
2
A liquid is heated to boiling and keeps boiling gently. The temperature of the liquid
1. Astays constant at the boiling point
2. Bfalls as particles escape
3. Crises steadily while it boils
4. Dfluctuates with the flame
( )
3
Solid iodine is warmed gently in a closed watch glass. The observation is
1. Ait melts to a brown liquid
2. Bit turns white and stays solid
3. Cit dissolves into the glass
4. Dviolet vapour forms without melting
( )
4
The rate of diffusion of a gas at constant temperature depends on the
1. Asize of its particles only
2. Bcolour of the gas
3. Crelative molecular mass of the gas
4. Dcontainer colour
( )
5
Water vapour condenses on a cold mirror. The particles of water
1. Again energy and spread apart
2. Blose energy and move closer together
3. Csplit into smaller particles
4. Dstop moving
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Explain answers using the particle model — particle language earns the marks.

1
A fixed mass of gas is trapped in a syringe and the nozzle is sealed.
1. (a)
  The plunger is pushed in. Explain, using the particle model, why the volume decreases.
  [2]
2. (b)
  Explain why the same trick barely works on a syringe of water.
  [2]
2
The table shows the temperature of a substance heated steadily in a water bath.
Temperature readings
Time (min) 0 1 2 3 4 5 6 7 8
Temperature (°C) −20 −8 0 0 0 18 45 70 92
1. (a)
  Identify the substance’s melting point and the state of the substance at 4 minutes.
  [2]
2. (b)
  Explain why the temperature between 2 and 4 minutes stays at 0 °C even though heating continues.
  [2]
3. (c)
  Suggest the temperature reading expected at 9 minutes, giving a reason.
  [1]
3
Two gas jars are connected by a tube. One holds bromine vapour (Mr 160) and the other holds hydrogen (Mr 2) at the same temperature. The taps are opened.
1. (a)
  Explain, in particle terms, why both gases end up evenly spread through both jars.
  [2]
2. (b)
  State which gas mixes through the tube faster and explain why.
  [2]
3. (c)
  State one observation that would show the bromine has finished spreading.
  [1]
4
A drop of ether (a volatile liquid) on the back of the hand feels distinctly cold as it evaporates.
1. (a)
  Explain why the liquid evaporates even though it is at room temperature.
  [2]
2. (b)
  Explain why the hand feels cold.
  [3]
3. (c)
  State and explain one way to make the ether evaporate faster.
  [1]

Time (min)	0	1	2	3	4	5	6	7	8
Temperature (°C)	−20	−8	0	0	0	18	45	70	92

— End of paper —