Chapter 2: Atomic Structure 1.2: Chemical Equations

Most of the informations is derived from the source 'AQA GCSE Chemistry Student Textbook', which is then formulated into my own words and is now understandbly easier.

Chapter 1: Atomic Structure

Topic 1.2: Chemical Equations 

Chemical equations show the reactants (the substances you start with) andproducts (the new substance made) in a reaction. They can also be phrased into word equations. 

For example, the test for Hydrogen gas.

Hydrogen + Oxygen → Water

      (Reactants)           (Product)

In chemical reactions, the atoms get rearranged. You can investigate what happens to the mass of reactants compared with mass of products in a reaction. 

Using symbol equations helps you to see how much of each substance is involved in a reaction. For example, Calcium Carbonate decomposes (breaks down) as of being heated. You can show the reaction in an equation like this:

CaCO3 → CaO + CO2

The equation is balanced, meaning there is the same number of each type of atom on both sides. (Both sides of the arrow have 3 O's, 1 Ca and 1 C.) This is very important, because atoms cannot be created or destroyed in a chemical equation.

This also…