Fe2O3 + H2 soanbaitap.com

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Fe2O3 + H2 soanbaitap.com

A chemical reaction is a chemical change which results in the formation of one or more products. The initial reactants differ in physical or chemical characteristics from the products formed.

Chemical reactions generally involve either the formation or the breaking of chemical bonds.
Combustion

When oxygen combines with another compound to form water and carbon dioxide. These reactions are exothermic, meaning they produce heat.

Synthesis
When two or more simple compounds combine to form a more complicated one. This is also known as a direct combination reaction.

A + B → AB
For example, iron and sulfur combine in a synthesis reaction to form iron (II) sulfide:
8Fe + S8 → 8FeS
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