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 Form 1 Chemistry Sample Exam Revision Questions With Answers

When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water.
(i) What causes this ignition?
(ii) Write an equation to show how this ignition occurs

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Answer Text:
a).The reaction is exothermic, it produces heat. This heat causes hydrogen to ignite.
b).Potassium + water -->potassium hydroxide +hydrogen +heat