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Chemical Equations

Atoms Molecules Ions Chemical Equations On-line practice


In a chemical reaction, substances are changed into other substances.  An equation is a way of writing this change.  It shows the starting substances (the reactants) and the new substances formed (the products).

An equation can be written in words.  This is called a word equation.

Example :

Magnesium + Oxygen --> Magnesium oxide

An equation can be written with formulas.  This is what is meant by a chemical equation.

Example :

2 Mg + O2 --> 2 MgO


Balancing chemical equation ]