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What product would you expect to obtain when reacting ethanal (or acetaldehyde) with potassium cyanide (KCN) in dilute acid? Draw a curly arrow mechanism for this transformation, and determine whether you obtain one enantiomer or a racemic mixture.

The product obtained is a cyanohydrin, with the formula CH3CH(OH)(CN) where the cyanide anion has acted as a nucleophile towards the aldehyde. The mechanism would first show the lone pair on the carbonyl oxy...
AS
Answered by Alex S. • Chemistry tutor
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Elements in the Periodic Table often show periodic trends. Describe and explain the periodic trend in atomic radius and electronegativity from Na to Cl.

Atomic Radius - As you go across the Periodic Table from left to right, the atomic radius decreases. This is because the electrons are added to the same shell and as you move from left to right. At the same ...
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Answered by Lauren M. • Chemistry tutor
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Define the term 'first ionisation energy' and explain why the first ionisation energy shows a general increase across period 2

The first ionisation energy is the energy required to remove an electron from each atom in one mole of gaseous atoms to produce +1 charged gaseous ions.The first ionisation energy shows an general increase a...
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Answered by Naledi N. • Chemistry tutor
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Explain why Silicon Dioxide has a higher melting point than Sulfur Trioxide.

Silicon Dioxide has a macromolecular/giant covalent structure which means it has covalent bonds between all atoms in its structure. Sulfur Trioxide has a simple molecular structure meaning it has Van der Waa...
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Answered by Holly T. • Chemistry tutor
23212 Views

What are 'Rate equations' and why are they useful?

The rate equation of a reaction is useful to describe the relationship between the rate of a reaction and the concentration of its reactants. It is used to determine how a change in the concentration of a sp...
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Answered by Joshua M. • Chemistry tutor
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