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OCR GCSE Chemistry Organic acids

Organic acids

This page covers the following topics:

1. Carboxylic acids
2. Amino acids

A carboxylic acid is an organic compound containing a carboxyl group (a carbon double bonded to an oxygen atom (O) and single bonded to an hydroxide (OH)) written as C(=O)OH. The formula of a carboxylic acid is R-COOH, with the R representing a carboxyl group. Carboxylic acids are weak acids.

Carboxylic acids

Amino acids are organic compounds, containing Carbon, Oxygen, Hydrogen, Nitrogen and a variable side chain group, here represented by 'R'. A chain of amino acids connected by peptide bonds forms a protein.

Amino acids

1

What is the name of the bonds between amino acids in protein chains?

What is the name of the bonds between amino acids in protein chains?

2

Give the IUPAC name of the amino acid pictured, Valine.

Give the IUPAC name of the amino acid pictured, Valine.

3

Draw a diagram showing a condensation reaction occuring joining two amino acids to form a peptide bond in a protein.

Draw a diagram showing a condensation reaction occuring joining two amino acids to form a peptide bond in a protein.

4

Why are carboxylic acids considered weak acids?

Why are carboxylic acids considered weak acids?

5

Give the IUPAC name of the amino acid pictured, Leucine.

Give the IUPAC name of the amino acid pictured, Leucine.

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