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There are three key ingredients to a good 30 mark question: A strong arguement, explanation of key concepts and then revelant, and as recent, examples as possible.

Although you have a sho...

The subjunctive is a mood used in French to express uncertainty, doubt, volition, fear and other emotions. Its use can be triggered by certain verbs or subordinative conjunctions. It is used in subordinat...

Defintions

Rationalising the denominator means rewriting a fraction so that the bottom only contains rational numbers.

Remember: A rational number is one that can be ...

Lets say we have 0.89 mol dm-3 of CH3COOH, a weak acid, with a ka of 1.7X10^-5.We want to find Ph, but to do this we first need to know [H+] because PH = -log10[H+].Because CH3COOH is a weak acid, it only...

Covalent bonding happens when two molecules share a pair of electrons. For example in hydrogen chloride (HCl). Ionic bonding is when two oppositely charged ions are attracted to each other to form a la...