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Draw the electronic structure of Sodium Chloride and explain how an ionic bond affects the melting and boiling point.

Ionic bonds are very strong, with elements involved in a compound having a full outer shell of electrons due to donating and accepting electrons, allowing them to be in a very stable state. In this case, Sod...
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Answered by Hans D. • Chemistry tutor
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Every year in Britain there are nearly 25 000 car fires, yet it is estimated that only five per cent of motorists...Which of the following is the best statement of the flaw in the argument above?

It implies that the occurrence of car fires is related to the lack of an extinguisher.
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Answered by Lucy E A. • TSA Oxford tutor
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Give one piece of evidence that supports the theory that mitochondria evolved from prokaryotic cells.

Mitochondria contain 70S ribosomes (as opposed to 80S which would be found in other eukaryotic organelles) the same as prokaryotic cells. They also have their own DNA (mtDNA) which is separate from the DNA o...
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Answered by Lucy E A. • Biology tutor
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Describe why organisms may become extinct due to a change in the climate

Species like polar bears might go extinct if, for example, sea level rise drastically decreases the size of their territory meaning they have less area to roam, hunt and mate in so they cannot reproduce fast...
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Answered by Lucy E A. • Biology tutor
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Explain why high population density increases the risk of disaster from natural hazards.

Because more people in a given space means that there is a greater overall demand for first aid response from any given medical centre, many people will be at risk of deteriorating health or even death if th...
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Answered by Lucy E A. • Geography tutor
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