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How can I work out whether a hydrocarbon is an alkene or an alkane from its molecular formula?

Step 1: Look at the molecular formula of the hydrocarbon you have been given. (This is the formula that tells you exactly how many hydrogens and how many carbons are present.) Step 2: * Refer back to the gen...
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Answered by Alice H. • Chemistry tutor
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Solve 3(2x + 5) = 4 – x

The first thing to do in this problem is to expand the brackets. This means we times whatever is in the bracket by the number on the outside, in this instance the number is 3. We do not worry about the right...
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Answered by Brandon R. • Maths tutor
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Show that 3/8 divided by 7/12 = 9/14

When dividing by a fraction, it is actually a multiplication. All you need to do is flip the second fraction over. This is known as the reciprocal. In this example the fraction we want to flip is 7/12. Flipp...
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Answered by Brandon R. • Maths tutor
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This is a sequence: 2,4,7,11,16. Find the Nth term

1/2n 2 + 1/2n + 1 This is a hard one and maybe closer to a maths challenge question. It is easier to explain in person. First common difference is 1 then 2 then 3 and so on. The second common difference is 1...
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Answered by Zia F. • Maths tutor
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Diamond and Graphite are both giant covalent structures. If they are both made of carbon why does diamond have a higher melting point?

Although both are giant covalent structures, they have different structures. Diamond makes a 3d structure with each carbon attached to 4 other carbons so the only bond to break when melting it is the very st...
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Answered by Zia F. • Chemistry tutor
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