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Chemical Reactions

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A series of free High School Chemistry Video Lessons.

In this lesson, we will learn

  • Synthesis Reaction
  • Combustion Reaction
  • Decomposition Reaction
  • Single Replacement Reaction

Synthesis Reaction
A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic. An example of a synthesis reaction is the formation of water from hydrogen and oxygen. Synthesis is, in essence, the reversal of a decomposition reaction.
Recognizing and understanding synthesis reactions. Determining Products of a Synthesis Reaction
Combustion Reaction
A combustion reaction (commonly known as burning) is an exothermic reaction in which something reacts with oxygen. The combustion of organic compounds usually takes the form organic compound + oxygen => water + carbon dioxide.
Recognizing and understanding combustion reactions.

Decomposition Reaction
A decomposition reaction is a reaction in which a single reactant produces multiple products. An example of a decomposition reaction is when water is broken down into hydrogen and oxygen. In essence, decomposition is the opposite of a synthesis reaction.
Recognizing and understanding decomposition reactions.
Single Replacement Reaction
In a single replacement reaction, a single element replaces an atom in a compound producing a new compound and a pure element. Like double replacement reactions, metals always replace metals and nonmetals always replace nonmetals in a compound.
Recognizing and understanding single replacement reactions.

This video explains Single Replacement Reactions in a very simple way. During the video, press pause to try some of the single replacement problems on your own. To solve single replacement reactions, you'll need an activity series.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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