1) The early atmosphere was formed from gases that escaped from .... a) volcanoes b) earthquakes c) mountains 2) The group 7 metals are also called the ...... a) alkali metals b) noble gases c) halogens d) reactive metals 3) Chlorine and Nitrogen are in the same group in the periodic table a) True b) False 4) Which process decreases carbon dioxide? a) respiration b) deforestation c) photosynthesis 5) The gas used up in respiration is ... a) water vapour b) oxygen c) carbon dioxide d) nitrogen 6) What type of reaction is a metal rusting? a) thermal decomposition b) oxidation c) neutralisation 7) Water vapour is a gas a) True b) False 8) Our atmosphere today conatins ___% Nitrogen a) 74 b) 73 c) 79 d) 78 e) 73 f) 71 9) Our atmosphere today contains __% oxygen. a) 24 b) 22 c) 25 d) 21 e) 32 f) 19 10) There is less water vapour now than the erly atmosphere because ... a) it is used in respiration b) it condensed to form oceans c) it condensed to form ice 11) Which process increased the levels of oxygen? a) photosynthesis b) respiration c) neither 12) What was made from animals shells using carbon dioxide? a) more plants b) carbonate rocks c) more animals 13) What is produced in photosynthesis? a) glucose & carbon dioxide b) Glucose & oxygen c) glucogon & oxygen d) Neither of the above 14) Deforestation ____ the levels of carbon dioxide in the air. a) decreases b) increases c) stays the same 15) How do humans causes changes to the gases in the amosphere? a) burning fossil fuels b) deforestation c) volcanoes d) both 1 & 2

C1 topic 1

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