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Question 1 of 10: Water is an important molecule in living organisms. (a) Water is a dipolar molecule that forms hydrogen bonds with other water molecules. (i) Explain the dipole nature of water. (2) (ii) The diagram shows three water molecules. Complete the diagram to show a hydrogen bond between two water molecules. (1) (b) Water plays a role as a solvent. Sodium chloride dissolves in water. The diagram shows a sodium ion (Na+). Complete the diagram to show the arrangement of two water molecules around a sodium ion when it is dissolved.

011.14 marks

Water as a transport solvent

Exam question

Mark points shown after marking

Water is an important molecule in living organisms.

Water is a dipolar molecule that forms hydrogen bonds with other water molecules.

(a)(i)

Explain the dipole nature of water.

(2)
(a)(ii)

The diagram shows three water molecules. Complete the diagram to show a hydrogen bond between two water molecules.

(1)

Select the two atoms that the hydrogen bond joins. 0/2 selected

Three separate water molecules, A on the left, B on the right and C at the bottom. Each has one oxygen atom joined to two hydrogen atoms.OHHOHHOHHABC
Three water molecules. Choose two atoms on different molecules to draw a hydrogen bond.

Water plays a role as a solvent. Sodium chloride dissolves in water.

(b)

The diagram shows a sodium ion (Na⁺). Complete the diagram to show the arrangement of two water molecules around a sodium ion when it is dissolved.

(1)

Select the atom of each water molecule that turns to face the sodium ion. 0/2 selected

A sodium ion in the centre. A water molecule on each side, each with its two hydrogen atoms pointing upwards.OHHOHHNa⁺waterwater
A sodium ion (Na⁺) between two water molecules. The molecules are not yet turned towards the ion.

Total for this question: 4 marks

Lesson: 1A 1: The Chemistry of Life