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What is relative molecular mass (RMM) and why use carbon-12?

This is the mass of the atoms in your compound relative to the mass of one atom of Carbon-12 (previously they used Hydrogen-1 or oxygen-16, but these have many naturally occurring isotopes). C-12 is easily m...
AP
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When an unsymmetrical alkene undergoes electrophilic addition you often get a major and minor product. What would the major product be when propene reacts with hydrochloric acid? Why is this?

The major product would be 2-chloropropane whilst the minor product would be 1-chloropropane. This is because the more stable secondary carbonation is formed as an intermediate. This is easy to show with a m...
JB
Answered by Jacob B. • Chemistry tutor
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How is an ionic bond formed?

To understand why an ionic bond happens between a non-metal and a metal we first have to understand why bonds are made in the first place. All atoms want to do is be stable! To become stable they must have a...
RC
Answered by Robert C. • Chemistry tutor
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What is Hess's law?

The enthalpy change in a reaction is independent of the route taken.
Answered by • Chemistry tutor
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Name and draw the mechanism by which benzene reacts with ethanoyl chloride in the presence of a catalyst. Also explain why benzene undergoes a substitution reaction, rather than an addition reaction.

Electrophilic substitution. (drawn) AlCl 3 + CH 3 COCl --> AlCl 4 - + CH 3 CO + (drawn) Then the electrophile CH 3 CO + attracts electrons from benzene's delocalised ring to form an intermediate, that the...
MS
Answered by Matthew S. • Chemistry tutor
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