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What are electrophilic addition reactions of alkenes?

Alkenes contain a pi bond, which is a site of high electron density, since it contains a pair of electrons delocalised around the two bonded carbon atoms. Because of this, the pi bond can act as a nucleophil...
JM
Answered by Jessica M. • Chemistry tutor
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Give and explain 2 of the anomalous properties of ice caused by hydrogen bonding (3)

Compared to water ice is less dense this is due to hydrogen bonds in the open lattice holding the H 2 O molecules apart whereas in liquid form the hydrogen bonds break allowing the molecules of water to be c...
ZB
Answered by Zahra B. • Chemistry tutor
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Why can you separate crude oil using distillation?

Different substances (fractions) can be separated as they have slightly different boiling points. Different hydrocarbons condense at different sections of the fractionating column, which is very hot at the b...
LW
Answered by Lydia W. • Chemistry tutor
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How does a fractional distillation tower work?

The crude oil, which is composed of a mixture of different hydrocarbons, is heated in the bottom of the tower, so that hydrocarbons with lower boiling points boil off first. The tower gets gradually colder a...
DK
Answered by David K. • Chemistry tutor
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The acid dissociation constant, Ka, of ethanoic acid is 1.78 x 10^-5 at 298K. Given that the concentration of a sample of ethanoic acid is 0.4moldm^-3, calculate its pH at 298K.

Using the acid dissociation equation, Ka = [H+][A-]/[HA]. (where Substitute the known values into the concentration to give 1.78x10 -5 = [H+][A-]/0.4 . Because the acid is dissociating in solution the acid d...
SR
Answered by Sita R. • Chemistry tutor
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