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Chemistry
A Level

An aldehyde CH3CH2CH2CHO reacts with potassium cyanide (KCN) to form a racemic mixture of two stereoisomers of CH3CH2CH2CH(OH)CN. A)Explain why a racemic mixture is formed and b)describe how you would distinguish between 2 samples of the stereoisomers

A) The aldehyde contains a planar carbon group which can be attacked from both sides. Each side has equal probability of being attacked resulting in a ra...

Answered by Isobel W. Chemistry tutor
6895 Views

Describe how to perform a flame test to identify an unknown compound.

The equipment needed is a bunsen burner, a wire loop, some HCl, and the compound being tested (usually in powder form). Set up the bunsen burner so that it is on a blue flame. Take the wire loop and dip i...

Answered by Martha N. Chemistry tutor
2313 Views

Define the term enthalpy of reaction

A chemical reaction occurs when bonds are broken and formed between atoms. Energy is taken in in order to break bonds; when a bond is formed the molecule becomes more stable, so energy is given out. The e...

Answered by Harry K. Chemistry tutor
2015 Views

Why do elements give off coloured light when heated?

When elements are heated, it causes their electrons to become excited. Electrons exist in discrete energy levels, and these energy levels are unique to each element. When the electrons are excited by heat...

Answered by Gemma C. Chemistry tutor
11297 Views

Why are zinc and Scandium not transition metals?

A transition metal is defined as an element that forms a stable ion with incompletely filled d orbitals. Scandium forms a 3+ ion with no electrons in its d orbitals and zinc forms a 3+ ion with completely...

Answered by Ellie O. Chemistry tutor
23929 Views

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