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chemistry > chemical reactions

  • Introduction
  • Word Equations
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Chemical reactions occur when two reactants (substances that can react) are combined. There are many types of reactions. For example, the process of creating food in plants is a chemical reaction. It is called photosynthesis.

How do we notice a chemical reaction?
Chemical reactions happen all around us so how do we notice them? 
  • ​Colour Change
  • Gas being given off
  • Temperature change
  • Mass (or weight) change
  • Precipitate form (a precipitate is when it goes cloudy)
  • Smell
​Some word equations to remember:
​metal + oxygen →  metal oxide
​metal oxide + acid → a salt + water
metal hydroxide + acid → a salt + water
​metal carbonate + acid → a salt + water + carbon dioxide

* When writing word equations in Chemistry, use an arrow (
→) instead of an equals sign (=). This is because the reactants aren't the same as the final compound, they are a result of the reaction.

Photo used under Creative Commons from goodrob13
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