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What are the oxidation numbers of each element in these examples: a) H2SO4 b) N2 c) NH4+

a) H 2 SO 4 ANSWER: H: +1 S: +6 O: -2 b) N 2 ANSWER: N: 0 (all elements not within a compound have an oxidation number of 0 eg I 2 , O 2 , K) c) NH 4 + ANSWER: N: -3 H: +1 (sum of oxidation numbers within co...
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Answered by Georgia B. • Chemistry tutor
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How to write a 'One effect question?'

GSCE examiners want to see a progression of thought and evidence of argument within these questions. Therefore the best way to tackle this would be to use connective words such as 'the fact that'.......'mean...
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Answered by Marius P. • History tutor
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Describe the formation of an Oxbow lake

An Oxbow lake is a middle-course feature of a river which is caused water eroding the corner of a meander, resulting in an isolated corner containing a body of water. This happens as the velocity of the wate...
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Answered by Marius P. • Geography tutor
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Explore the presentation and perception of unconventional love in three texts

The easiest ways to distinguish yourself with these sorts of questions is to keep your approach entirely thematic, avoiding any sense of chronology or order. It's all too easy to slip into analysing a text's...
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What is meant by a monopoly?

The legal definition of a monopoly is, any firm within an industry which possesses more than 25% market share. This can give an insight into how a 'monopoly' firm behaves, compared to firms in other forms of...
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