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An example of decomposition is the breakdown of hydrogen peroxide when it is exposed to light:

Single-displacement Reaction is a reaction in which the atoms of one element replace the atoms of
another element in a compound:

AC + B A + BC

An example of a single-displacement reaction is:

Double-displacement Reaction is a reaction in which two different ionic compounds exchange ions:

AB + CD AC + BD

An example of a double-displacement reaction is:

Question

Which of the following is a synthesis reaction?

A

B

C

D

Answer

The correct choice is A. B is a double-displacement reaction; C is a single-displacement reaction; D is a
decomposition reaction.

Understanding Acids and Bases

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+
All aqueous solutions contain hydrogen ions (H ) and hydroxide ions (OH ). The relative amount of these
two ions determines whether a solution is neutral, acidic, or basic. In a neutral solution, the concentration
of the two ions is identical. In addition to pure water, solutions of salts such as NaCl, are neutral.