
The word equation for photosynthesis is:
water + carbon dioxide glucose + oxygen
The word equation for respiration is:
glucose + oxygen carbon dioxide + water
Use your scientific knowledge to explain which process is exothermic and which is endothermic.

Important Questions on Energy Transfers in Chemistry
Match each change of state with its energy change.
Change of state: Melting, freezing, condensing, evaporating
Energy change: Exothermic, Endothermic.

Explain how sweating cools the skin.
Energy transfers from the skin to sweat as ______. A moisture leaves the skin _____ , it carries a lot of heat with it, cooling your body.

The diagram shows a burring candle.
Describe what happens to the wax as the candle burns.


Safi has drawn a sketch graph to show how the temperature of the wax changes as the candle burns. Explain why there is a plateau in the graph.
