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Given the balanced equation representing a reaction:2H2 + O2 → 2H2O + energyWhich type of reaction

August 2018 NY Regents Chemistry Exam

37 Given the balanced equation representing a reaction: 2H2 + O2 → 2H2O + energy Which type of reaction is represented by this equation? (1) decomposition (2) double replacement

(3) single replacement

(4) synthesis

Solution: In synthesis two or more molecules come together to form one bigger molecule: A+B--> AB

Decomposition is the opposite of synthesis: AB --> A+B

In a single replacement reaction, one element replaces another: A +BC --> B +AC

In a double replacement reaction partners get exchanged: AB +CD --> AD +CB

Answer: 4

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