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Describe the trend in boiling point of the halogens.

The boiling point of the halogens increases as you go down the group. The halogens exist as diatomic molecules, with both atoms sharing an electron to completely fill the outer shell. The increase in boiling...
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Answered by Lucy W. • Chemistry tutor
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The price of tea in the UK increased from £7.20 per kilo to £8.48 per kilo. Over the same period the quantity of tea purchased fell from 97 million kilos to 76 million kilos. Calculate the price elasticity of demand for tea.

Price elasticity of demand = change in demand / change in price change in price = 7.20 --> 8.48 = 17.78% increasechange in demand = 97 million --> 76 million kilos = 21.6% decrease therefore PED = -21....
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Answered by William H. • Economics tutor
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What is the difference between catabolic and anabolic reactions? Give an example of a catabolic reaction you have studied.

In biology catabolic reactions are biochemical reactions during which an organic molecule is broken down. This process is usually involved in the production of energy. In contrast, anabolic reactions are bio...
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Answered by Gabriele Z. • Biology tutor
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When do you use "ser" and when do you use "estar"

So "ser" and "estar" both mean "to be".Ser should be used when you're talking about an intrinsic quality of something eg. a description, the time, a characteristic of something ...
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Answered by Vishal G. • Spanish tutor
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How do I structure an essay question?

In order to write a high quality essay question it needs to contain some key elements. To make a good impression to your examiner you need to start with a good but concise introduction to introduce some of t...
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