Top answers

Why are metals good conductors?

Metals have delocalised electrons which are free to move and carry charge throughout the sea of cations.
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Answered by Emma H. • Chemistry tutor
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What is a depression?

A depression is a weather system of low pressure which moves across the British Isles from west to east. It involves two air masses which meet at a front. The air masses are tropical maritime which brings wa...
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Answered by Emma H. • Geography tutor
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What are ionic bonds?

Ionic bonds are electrostatic forces of attraction between oppositely charged ions.
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Answered by Emma H. • Chemistry tutor
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Differentiate xcos(x) with respect to x

We have two functions multiplied together: x and cos(x). Therefore we have to use the product rule. First differentiate x and leave cos(x) untouched, so we get 1(cos(x))=cos(x). Then differentiate cos(x) and...
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Answered by Ioannis L. • Maths tutor
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How do enzymes work?

Enzymes are molecules in the body that break down specific substrates which can then be used for energy or stored. An enzyme contains an active site that is complementary in shape to the substrate being brok...
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Answered by Emma H. • Biology tutor
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