A level Paper 2 mistakes

Question 1

How do you work out Ea when using Arrhenius constant?

Answer 1

Calculate the gradient between 2 points.
Multiply by R (8.31) to get Ea in J.
Divide by 1000

Question 2

In condensation polymerisation with an alcohol and carboxylic acid group, how is the water molecule formed?

Answer 2

The OH from the carboxylic acid combines with the H from the alcohol.

Question 3

One similarity and one difference between addition polymers and condensation polymers.

Answer 3

In both, monomers join by covalent bonds to form polymers.
No additional products in addition. A water molecule is also formed in condensation polymerisation.

Question 4

Give 3 ways in which polymers can be utilised to improve their sustainability.

Answer 4

Recycle
Incinerate to release energy
Use as feedstock

Question 5

If a dicarboxylic acid is diluted and then 25cm3 is titrated with sodium hydroxide, what is the ratio in which they react?

Answer 5

base : carboxylic acid
2. : 1

Question 6

Explain why amino acids are crystalline solids at room temperature.

Answer 6

Amino acids exist as zwitterions.
So ionic bonds form between amino acids.