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AQA A Level Chemistry

Topic questions Bonding, structure and the properties of matter Amino acids

Amino acids

9 questions · 18 marks · about 20 minutes

Amino acids questions

TopicAmino acids

AQA 7405 Amino acids 9 questions

Paper 3 June 2022, Question 29 1 mark

Which is the main species present in an aqueous solution of aspartic acid at pH = 14?

Figure for question 29
[1]
Reveal mark scheme Mark scheme for question 29

Paper 3 June 2019, Question 35 1 mark

Use the Data Booklet to help you answer this question

Which is the main aspartic acid species present in an aqueous solution at pH = 14?

Figure for question 35
[1]
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Paper 2 June 2017, Question 6 10 marks

Figure for question 6

This question is about amino acids and peptide (amide) links.

6.1

Draw the structure of the zwitterion formed by phenylalanine.

[1]
Reveal mark scheme Mark scheme for question 6.1
6.2

Draw the structure of serine at high pH.

[1]
Reveal mark scheme Mark scheme for question 6.2
6.3

Draw the structures of both dipeptides formed when phenylalanine reacts with serine.

In each structure show all the atoms and bonds in the amide link.

[2]
Reveal mark scheme Mark scheme for question 6.3
6.4

An amide link is also formed when an acyl chloride reacts with a primary amine.

Name and outline a mechanism for the reaction between CH3CH2COCl and

Question 6, shown as an image

Give the IUPAC name of the organic product.

Name of mechanism

Mechanism

IUPAC name of organic product

[6]
Reveal mark scheme Mark scheme for question 6.4

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Do the mole calculation
Write ‘exothermic’ and pray
Me on the 6-marker about electrolysis
Knowing water is H₂O
Balancing an equation first try
Getting two concordant titres
Realising nobody actually knows what a mole is
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