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Explain why fluorine is more reactive than chlorine.

There are three things to consider every single time relative reactivity is unknown: atomic radius, shielding, and number of electrons. The reactivity is the halogens ability to gain an electron, so number o...
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Answered by Steven A. • Chemistry tutor
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What is an indirect question? How do I identify it?

An indirect question is a question which has been previously asked and is now being reported. An example of this in english is: The teacher asked whether the students had done their homework. The original qu...
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Answered by Alicia E. • Latin tutor
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What makes DNA molecules so stable?

The main bonding in DNA which renders the double helix structure so stable is that of hydrogen bonds. Between the complementary base pairs, hydrogen bonds connect the two strands of the helix. There are 3 H ...
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Answered by Steven A. • Biology tutor
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Rearrange the following, making c the subject: (3c + b)/2 = c + a

Rearranging is one of the trickier topics in GCSE maths, however as long as you follow it through step by step you shouldn't have a problem. The question asks you to make 'c' the subject. This means you need...
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Answered by Olivia C. • Maths tutor
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Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?

This question can be difficult, because it involve a lot of words. This can make it confusing as to what information we really need to use - just work it through step by step. Sam uses 140g of flour to make ...
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Answered by Olivia C. • Maths tutor
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