January 2019 NY Regents Chemistry Exam
33 Given the equation representing a chemical reaction:
NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
This reaction is classified as a (1) synthesis reaction (2) decomposition reaction (3) single replacement reaction
(4) double replacement reaction
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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