Six molecules of the same amino acid join to form one chain.
The table shows the total number of each type of atom before and after the chain forms.
| Type of atom | In the six amino acid molecules | In the chain |
|---|---|---|
| Carbon | 18 | 18 |
| Hydrogen | 42 | 32 |
| Nitrogen | 6 | 6 |
| Oxygen | 12 | 7 |
Use the data to give the formula of the small molecule formed and calculate how many molecules of it are produced.
A second chain is made from nine molecules of the same amino acid.
Calculate the total number of oxygen atoms in this chain.
94 exam-style questions on AQA GCSE Chemistry 7.3 Synthetic and naturally occurring polymers, covering 7.3.1 Addition polymerisation, 7.3.2 Condensation polymerisation, 7.3.3 Amino acids, and 7.3.4 DNA (deoxyribonucleic acid) and other naturally occurring polymers. Each one has a worked solution and a mark scheme showing where the marks go.