See your revision guide for the symbol equations.
Sometimes you will see this as 3 steps rather than 4 (all the water is added at once so you go straight from calcium oxide to calcium hydroxide solution).
This is quite often linked to a question about mass in a reaction. Remember, the total mass of the reactants = the total mass of the products.
It's usually a simple addition or subtraction but may need you to explain your answer.
Explanation: No atoms are lost or made in a chemical reaction; mass is always conserved.
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