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What is the difference between the perfect tense and the imperfect tense?

The perfect tense (in french le passé composé) is used to describe completed actions, whereas the imperfect tense (l'imparfait) refers to an event that used to happen, or an action that cannot be described a...
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Answered by Isobel D. • French tutor
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Graphite and diamond are both made from carbon atoms. Why can graphite conduct electricity while diamond cannot?

The carbon atoms in diamond make four bonds The carbon atoms in graphite make three bonds Graphite has delocalised electrons which can move through the graphite to carry a charge Diamond does not have deloca...
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The MMR vaccine is given to children in order to prevent the conditions measles, mumps and rubella. Describe how a vaccine works?

Vaccines contain dead or inactive forms of a pathogen. - These dead or inactive forms stimulate the white blood cells to produce antibodies against the pathogen. - If a person is infected by the pathogen in ...
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Answered by Victoria H. • Biology tutor
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How significant was the 1933 Reichstag fire in consolidating Nazi power?

The Reichstag fire was just one of the factors that contributed to the consolidation of Nazi power. It was significant in that it gave the Nazis the excuse they needed to gain control over their political ri...
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Answered by Philippa L. • History tutor
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Factorise y^2 + 7y + 6

So here we have a quadratic equation because it has the structure a^2 + bx + c. In order to factorise a quadratic we first need to look for two numbers that we can multiply together to get 6 and add together...
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Answered by Victoria H. • Maths tutor
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