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Explain which species is oxidised in this reaction: Br2 +2I– 2Br– +I2.

A useful way to answer oxidation/reduction questions is to remeber the acronym OIL RIG: O xidation I s L oss (of electrons) R eduction I s G ain (of electrons) In this example Iodine is going from 2I- to I2 ...
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Answered by Rory B. • Chemistry tutor
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How do I solve simultaneous equations?

Simeltanous equations are a pair of equations that have 2 unknows. In order to solve a simelatneous equation 1 of the unknows must be eliminated. This can be done by either: 1. Substitution - This involves p...
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Answered by Rory B. • Maths tutor
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What is an Extraneous Variable?

An Extraneous Variable is something that the experimenter cannot control, which can have an effect on the overall outcome of the experiment. The main four extraneous variables are demand characteristics, exp...
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Answered by Lydia S. • Psychology tutor
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How does Candy's dog and his fate foreshadow other events?

Candy's dog was once very helpful on the farm, but due to his old age he now has nothing to offer the branch. This is similar to Candy himself, who recognises he is increasingly becoming less useful and will...
LS
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How can I effectively analyse an unseen poem in exam conditions?

Under high-stress conditions, such as an exam, the most important thing is not to rush in and panic. Read the poem all the way through once or twice without making any annotations. Once you feel that you hav...
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