1) click the correct answer a) burning is a reversible change b) fire is an exothermic reaction c) fire needs nitrogen to burn  d) none of the above 2) an exothermic reaction a) releases heat and light energy b) does not produce heat c) only produces light d) none of the above 3) fire needs ............. to burn a) nitrogen  b) hydrogen c) argon d) sulphur e) a match f) oxygen   4) fire ................. exist in a vacuum  a) can b) can not c) can maybe d) can sometimes  5) explosions need.........[list three answers ] a) sulphur  b) catalist   c) oxygen  d) heat e) fuel f) mixed gasses 6) where is the hottest part of a flame? a) top of the orange part b) middle of the orange part c) top of the blue part d) above the flame e) to the left f) to the right 7) what is a flame made of? a) flickering air b) hot gases c) glowing soot particles d) nitrogen e) argon f) radiation 8) if you put a jar over a burning candle it will ... a) go out at once b) keep on burning c) burn for a while, flicker and then go out d) change colour e) none of the above f) explode 9) burning gas makes .... a) carbon dioxide b) nitrogen c) water d) carbon dioxide and water e) air f) air and water 10) what burns most cleanly? a) wood b) methane c) nitrogen d) hydrogen e) coal f) water

5D Alex V

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