Edexcel A-Level Biology AS 1.1 Water As a Transport Solvent Questions

Practise explaining water polarity, dipole charges, hydrogen bonding, ion dissolution and solubility as the basis of transport using marked Edexcel IAL Biology evidence.

Exam points

Describe the dipole nature of water, including partial charges and uneven electron distribution.
Explain how water polarity and hydrogen bonding dissolve ions and polar solutes.
Relate hydrogen bonding and polarity to water’s solvent and transport roles.
Use solubility evidence to compare substances and explain hydrophobic or polar interactions.

[Maximum number: 2]

The structure and properties of the cell membrane are important in controlling which molecules can enter and leave a cell.

The diagram shows the permeability of cell membranes to some chemicals.
sodium and chloride ions

Figure for Question Edexcel A-Level Biology AS 1.1 Water As a Transport Solvent Questions question 1 — Edexcel A-Level Biology AS

The sodium and chloride ions, glucose and water are polar chemicals.
A steroid is a non-polar chemical.

Describe the dipolar nature of water.

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Edexcel A-Level Biology AS 1.1 Water As a Transport Solvent Questions question 1