(a) Diagram 1.1 shows the results of an experiment to
investigate the movement of bromine particles in air.
(i) State the name of the process involved in this
experiment. [1 mark]
(ii) State the type of particles present in bromine gas. [1
mark]
(iii) Explain the observation in this experiment based on
the kinetic theory of matter. [3 marks]
(b) Diagram 1.2 shows a graph of temperature against time
when solid X is heated?
(i) State the melting point of X. [1 mark]
(ii) What happens to the temperature while the substance
changes state? Explain. [2 marks]
(iii) Explain the movement of particles X between R and T during heating. [2 marks]
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