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Edco Exam Papers here:

Question

Answer

(a)

Method: 


Place 10 g of ice cubes in a beaker and heat using a Bunsen burner. 

The ice will melt forming a liquid. Continue heating the liquid in the beaker and it will start to evaporate forming a gas. 

Turn off the Bunsen burner and place a clock glass over the beaker. The steam will condense on the clock glass. 

Place the beaker into a freezer for a few hours and the liquid will freeze and form a solid.


(b)

(c)
Point A: Melting
The particles in the solid gain energy and change state to a liquid.

Point B: Evaporation
The particles in the liquid gain energy and change into a gas.

(d) There is no change in mass and a new substance is not formed as these are physical changes, which are reversible. There is no change in particles, just their arrangement and their energy.