In which type of reaction can two compounds exchange ions to form two different compounds?

June 2017 NY Regents Chemistry Exam

9 In which type of reaction can two compounds exchange ions to form two different compounds? (1) synthesis (2) decomposition (3) single replacement

(4) double replacement

Solution:

Types of Chemical Reactions:

Synthesis = two or more reactants come together to form one product A+B--> AB

Decomposition = opposite of synthesis, one reactant breaks into multiple products.

AB --> A+B

Single Replacement= one element replaces another element that is a part of a compound A +BC --> AC +B

Double Replacement = two elements in two compounds replace one another. Think of two dancing couples switching partners. AB +CD --> AD +CB

Answer: 4

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