Chemical Reactions Study Guide

Synthesis reaction
A reaction where two or more substances combine to form a more complex substance.
Decomposition reaction
Occurs when a substance breaks down into two or more simpler substances.
Single Replacement Reaction
Atoms of one element replace atoms of another element in a compound.
Double Replacement Reaction
Occurs when atoms and two different compounds trade places with each other.
Substances that enter a chemical reaction
Substances that are produced by a chemical reaction
Number written in front of the compound in a chemical equation
Small numbers in chemical equation
Physical changes
Changes that are reversible
Chemical changes
Changes that are not reversible
Chemical reaction
A reaction between two or more chemicals that forms a new substances.
Law of Conservation of Mass
Matter can neither be created nor destroyed
How do Scientist represent chemical reactions
Chemical Equations
Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed
Therefore, there must be the same number of atoms of each element on each side of a chemical equation.
Exothermic reaction
A chemical reaction that gives off heat energy
Endothermic reaction
A chemical reaction that absorbs heat energy

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