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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 subordinate c...

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 made by dividing two whole numbers (e.g. ...

Cancer: what is it? A cancer happens when cells begin to divide out of control. Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane. They do not invade oth...

Initially drawing a diagram of the two lines helps to establish whether values should be positive or negative and gives a rough approximation of where the answer may be: By doing this we see the point of int...

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 pa...