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Hydrochloric acid is an example of a strong acid because it is completely ionised in water. 

The best way to think of a mole is the same way you would consider a dozen to be 12 but in this case a mole is 6.2 x 10²³ molecules. 

You can use moles to work out the mass of ...

Basicallly a mole refers to a number, in the same way as a dozen also refers to a number, this number being 12. Except instead of 12, the word mole refers to the number of 6 x 10²³, which is...

Covalent bonding is the sharing of electrons between 2 or more non metals. 

Oxidation is the loss of electrons.