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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