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Chemistry
A Level

Why does ice float on water?

Water has strong intermolecular hydrogen bonds that hold the water molecules close together, making it very dense. As water freezes, the hydrogen bonds move further apart as it forms a hexagonal lattice. ...

NR
Answered by Nia R. Chemistry tutor
2392 Views

What is an optical isomer?

Optical isomers are a form of stereoisomers which are chemical species with the same structural formula, but have a different arrangement of atoms in 3-dimensional space. Optical isomers are characterised...

TD
Answered by Thomas D. Chemistry tutor
2118 Views

Describe a test that could be used to distinguish between potassium sulfate (K2SO4) and potassium nitrate (KNO3)

Add a solution containing Barium ions (eg BaCl2, Ba(OH)2, etc)K2SO4 will form white precipitateKNO3 will have no visible change

IW
Answered by Isobel W. Chemistry tutor
14228 Views

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...

IW
Answered by Isobel W. Chemistry tutor
7619 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...

MN
Answered by Martha N. Chemistry tutor
2805 Views

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