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Questions on Energy Transitions

Q3. The back window of this car contains a heating element. The heating element is part of an electrical circuit connected to the battery of the car.

In very cold weather, ice may form on the back window of the car. When the heating element is switched on, the ice will disappear and the surface of the window will become clear and dry.

(i) Choose a word to fill the gap in the sentence below:

When the heater is switched on, ........................................ energy is transferred from the wires to the ice.

1 mark

(ii) As the window becomes clear and dry, physical changes take place in the ice.

Fill the gaps below to show the physical changes which take place.

The ice changes from a …………………. to a ……………………….to a ……………………

1 mark