Edexcel IAL Biology 1.1 Water as a transport solvent

Show the partial charges and attraction to ions before linking dissolution to transport, then retain standard form, percentages and units in quantitative answers.

Exam points

Explain dissolution by orienting water's partial charges around positive and negative ions.
Complete or interpret molecular diagrams showing water polarity and ion attraction.
Calculate water availability from percentages and standard-form volume data with units.

[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 1.1—Water as a transport solvent 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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1.1—Water as a transport solvent question 1