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Why is a percentage yield never 100%?

There are a few reasons why percentage yield will never be 100%. This could be because other, unexpected reactions occur which don't produce the desired product, not all of the reactants are used in the reac...
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Answered by Alex B. • Chemistry tutor
59983 Views

How do double bonds form?

Double bonds consist of two types of bond, a pi bond and a sigma bond. The sigma bond is a single bond, and is formed by the overlap of two s-orbitals. The pi bond is formed by the sideways overlap of non-bo...
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Answered by Alex B. • Chemistry tutor
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Does economic growth lead to economic development?

Economic growth is a factor of economic development however it does not guarantee economic development. It depends on population growth, the extent the increase increase in GDP and various other factors.
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Answered by Haneen S. • Economics tutor
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Psychologists have claimed that some studies of eyewitness accounts lack ecological validity. Explain why these studies might lack ecological validity. (3 marks)

Eyewitness accounts lack ecological validity as they do not take in the real world, like they would in an actual crime scene. They may take place in a laboratory setting. Therefore, their findings cannot be ...
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Answered by Emma D. • Psychology tutor
3186 Views

How can I write a strong introduction to an unseen text exam question?

Beginning to write in an English exam is difficult, especially when it is an exam question revolving around a text you have never encountered with before. There is, however, five features which you can inclu...
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Answered by Kelly C. • English tutor
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