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Chemistry

A Level

What is Le Chatelier's principle?

If a reaction at equilibrium is subjected to a change in concentration, pressure or temperature, the position of equilibrium will move to counteract that change.

Answered by Bridget S. • Chemistry tutor

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Give the two reactions required in order to convert an alcohol into a hydroxynitrile. Include reactants and conditions. (6 marks)

Convert an alcohol into a ketone by heating it in reflux apparatus with potassium dichromate/K₂

Answered by Annabelle B. • Chemistry tutor

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Explain how a hydroxynitrile is produced from a ketone

Hydroxynitriles are produced from ketones by a nucleophilic addition reaction. The negatively charged cyanide ion from KCN is attracted to the partially positive carbon on the carbonyl group. This causes ...

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Name the reagent and explain the process of 1-bromoethane into propanoic acid

Produce the Grignard reagentMg in a dry ether (ethoxyethane) with CH3CH2BrCH3CH2Br + Mg ---> CH3CH2MgBrAddition reaction with the Grignard and CO2 to produce a Carboxylic acid Must be hydrolysed using ...

Answered by Oscar W. • Chemistry tutor

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Explain why the first ionisation energy of phosphorous is different to that of sulfur

Sulfur has an atomic number of 16, phosphorous is 15. The first ionisation energy of a periodic row usually increases left to right. This is because number of protons increases thus increasing nuclear cha...

Answered by Hollie S. • Chemistry tutor

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