State whether the following statement is true or false:

A chemical equation can be balanced easily by altering the formula of a reactant or product.

3 What happens chemically when quicklime is added to water filled in a bucket? 4 Why should magnesium ribbon be cleaned before burning in air? 6 What is wrong with the following chemical equation?

Mg + 0 MgO

Correct and balance it.

7 What does the symbol (aq) represent in a chemical equation?