A single displacement reaction, is a chemical reaction in which one (or more) element(s) replaces an\other element(s) in a compound. It can be represented generically as: A+B-C--->A-C+B.
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If the glasses and glove were wrong then I would chose the fire extinguisher and the power source should be the correct answer.
That's just what I would do though.
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I think u understand this answers
