2 This question is about sea water and the substances found in sea water.

(a) Table 2.1 shows the masses of the compounds formed when \(1000 \mathrm{~cm}^{3}\) of sea water is evaporated.
Table 2.1

Answer these questions, using the information from Table 2.1.
(i) State the chemical name of \(\mathrm{CaCO}_{3}\).
................................................................................................................................. [1]
(ii) The total mass of compounds formed from \(1000 \mathrm{~cm}^{3}\) of sea water is 19.0 g .
Calculate the total mass of compounds formed from \(1750 \mathrm{~cm}^{3}\) of sea water.
mass = g [1]
(iii) Magnesium sulfate is soluble in water.
Choose one other compound that is soluble in water.
Tick \((\checkmark)\) one box.

[1]

(b) Potassium chloride is found in sea water and contains chloride ions.
Describe a test for chloride ions.
test

observations

[2]

(c) Sodium ions are in sea water.
Complete Fig. 2.1 to show:
- the electronic configuration of a sodium ion
- the charge on the ion.

Fig. 2.1
[2]

(d) Sodium chloride forms a liquid when heated.
Describe the arrangement and motion of the particles in a liquid.
arrangement
.
motion
.
[2]

(e) Sodium chloride is an ionic compound that dissolves in water.
State two other properties of an ionic compound.
1
2
[2]

(f) Sea water contains dissolved gases.
Name the gas that is essential for aquatic life.
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This question is about sea water and the substances found in sea water. Potassium chloride is found in sea water and contains chloride ions. Describe a test for chloride ions. test observations

Answer:

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