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SCIPAD - BIG IDEAS - BOOK 2
FUELS AND CLIMATE CHANGE
End of Chapter Puzzle
Use the clues below to complete the crossword.
Across
1. A type of fuel made from renewable resources.
3. Describes the typical weather and
temperatures in different regions of the world.
7. A fuel, such as the range of fossil fuels, that
cannot be replaced once they are used up.
8. Hawaiian volcano where Dave Keeling
measured the carbon dioxide levels in the
atmosphere.
11. The number of valence electrons in a carbon
atom.
12. Very hard mineral made of carbon.
14. Element that is required to burn fuels.
16. Element that is fundamental to life on earth.
17. The layer of gases that surround Earth.
19. Black substance that forms on surfaces placed
in a yellow Bunsen flame.
20. A substance that can be burned to release
heat and light energy.
21. The type of combustion that occurs when
there is plenty of oxygen present.
Down
2. Liquid that becomes cloudy when carbon
dioxide gas is bubbled through it.
3. Gas released during combustion. Its level in
the atmosphere is steadily rising.
4.		 Carbon _______________ can replace oxygen
in our bloodstream, causing sickness and
death.
5. Liquid that can be recovered from the gases
produced during combustion.
6. A Bunsen flame undergoing incomplete
combustion will be this colour.
9.		 A fuel that can be replaced in a relatively
short time.
10. The type of reaction when a fuel reacts with
oxygen.
13. Type of combustion that occurs when oxygen
is limited.
15. The Earth’s atmosphere behaves like one
because of carbon dioxide in the atmosphere.
18. A Bunsen flame undergoing complete
combustion will be this colour.
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