Page 5 - ACE YR IGCSE A TOP APPROACH TO CHEM

8 Which of the following statements is 1 happens. The particles of tea move
correct about condensation? 2 in hot water.
A The particles lose kinetic energy and
move further away. gap 1 gap 2
B The particles lose kinetic energy and A diffusion slower
move closer together.
C The particles gain kinetic energy and B evaporation slower
move further away. C diffusion faster
D The particles gain kinetic energy and D evaporation faster
move closer together.
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10 In a pressure cooker, the gas particles 1
9 A tea bag is put in a teacup with hot water,
whereas another tea bag is put in a teacup kinetic energy and move faster. The
collisions between the gas particles with
with cold water. After 1 hour, the colour of the walls of pressure cooker 2 the
the water changes.
pressure in it. The food in it is eventually
being cooked.
gap 1 gap 2

A lose increase
Colour change Colour change
in hot water in cold water B lose decrease
after 1 hour after 1 hour
C gain increase
D gain decrease

Part 2: Structured Questions

Answer all questions.

1 Bromine is a halogen. It melts at t°C and boils at 59°C. A sample of pure bromine is slowly
heated from –10°C to 80°C. Its temperature is measured every minute and the results are
shown on the graph.
Temperature / °C
F
80°C

D E

B C
t°C A
–10°C
Time / minutes

(a) Fill in the state symbols in brackets for the chemical reactions that reach equilibrium in
the region DE.
Br ( ) L Br ( ) [2]
2 2
(b) What is true about t°C?

[2]

Cambridge IGCSE TM
2 Ace Your Chemistry

Chapter 1.indd 2 3/4/22 11:57 AM