Boiling Point

Key Stage 4

Meaning

Boiling point is the temperature at which the particles in a liquid gain enough energy to form a gas.

About Boiling Points

Different substances have different boiling points.

The boiling point of a substance is determined by the strength of the bonds which hold the particles close together in a liquid. The stronger the bonds the higher the boiling point.

When a substance is heated to its boiling point it will remain at this constant temperature until all of the liquid has boiled.

The boiling point of pure water is 100°C or 373 Kelvin.

Adding salt to water can increase its boiling point, causing it to boil at a higher temperature. This is because the salt increases the force of attraction between adjacent particles.

The Noble Gases all have very low boiling points because there is a very weak force between the atoms.

References

AQA

Boiling points, pages 155-6, GCSE Combined Science Trilogy 2, Hodder, AQA

Boiling points, pages 36-37, 47, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Boiling points, pages 80-81, 85, GCSE Physics; Third Edition, Oxford University Press, AQA

Boiling points; alkali metals, page 26, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Boiling points; halogens, page 28, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Boiling points; hydrocarbons, pages 150-151, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Boiling points; purity analysis, pages 180-181, GCSE Chemistry; Third Edition, Oxford University Press, AQA

Edexcel

Boiling point, page 147, GCSE Combined Science, Pearson Edexcel

Boiling point, page 3, GCSE Chemistry, Pearson, Edexcel

Boiling point; ionic compounds, page 182, GCSE Combined Science, Pearson Edexcel

Boiling point; ionic compounds, page 38, GCSE Chemistry, Pearson, Edexcel

Boiling point; molecular compounds, page 186, GCSE Combined Science, Pearson Edexcel

Boiling point; molecular compounds, page 42, GCSE Chemistry, Pearson, Edexcel

Boiling, page 98, GCSE Chemistry, CGP, Edexcel

OCR

Boiling points, pages 76-77, Gateway GCSE Chemistry, Oxford, OCR

Boiling points; distillation, pages 44-45, 238-239, 270-271, Gateway GCSE Chemistry, Oxford, OCR

Boiling points; hydrocarbons, pages 238-239, 241, Gateway GCSE Chemistry, Oxford, OCR

Boiling points; measuring, pages 10-11, 270-271, Gateway GCSE Chemistry, Oxford, OCR

Boiling points; metals versus non-metals, page 52, Gateway GCSE Chemistry, Oxford, OCR

Boiling points; trends in Periodic Table, pages 134, 139, Gateway GCSE Chemistry, Oxford, OCR