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Edexcel IGCSE Chemistry A States of Matter Questions

Practise states of matter using particle diagrams, change-of-state labels, diffusion experiments and solubility data from Edexcel questions.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • compare solid, liquid and gas particle arrangements using diagrams and descriptions
  • name state changes and add correct state symbols to simple water equations
  • calculate solubility from mass data and explain crystallisation on cooling

Covered syllabus points

1.1 States of matter1.2 State changes1.3 Diffusion and dilution1.4 Solutions terminology1.5C Solubility1.6C Solubility curves1.7C Solubility practical

Question 1

[Maximum number: 2]

This is a question about metals and their compounds.

Mercury is the only metal that is liquid at room temperature.

Describe the difference in the movement of particles in liquid mercury and in a solid metal.

Question 2

[Maximum number: 1]

Carbon dioxide changes directly from a solid to a gas without becoming a liquid.

Give the name of the change of state from solid to gas.

Question 3

[Maximum number: 6]

Question (a)

(a)

State the meaning of the term solute.

[ 1 ]

Question (b)

(b)

State the meaning of the term solvent.

[ 1 ]

Question (c)

(c)

Explain what is meant by a saturated solution.

[ 2 ]

Question (d)

(d)

A dark purple liquid is diluted by adding water.
The diluted liquid becomes a pale purple colour.
Explain the process that causes this change.
Refer to particles in your answer.

[ 2 ]

Question 4

[Maximum number: 2]

A dark purple liquid is diluted by adding water.
The diluted liquid becomes a pale purple colour.
Explain the process that causes this change.
Refer to particles in your answer.

Question 5

[Maximum number: 2]

A student investigates the solubility of potassium nitrate in water.
She measures the masses of potassium nitrate that dissolve in 25 cm3 of water at different temperatures.

The table shows the student's results. One of the results is anomalous.

Table for Question 5 — Edexcel IGCSE Chemistry

Use your graph to calculate the solubility of potassium nitrate in g per 100 g of water at 25∘C25^{\circ} \mathrm{C}.
[ 1.0 cm31.0 \mathrm{~cm}^{3} of water has a mass of 1.0 g ]
solubility = g per 100 g of water

Question 6

[Maximum number: 5]

A student investigates the solubility of potassium nitrate in water.
She measures the masses of potassium nitrate that dissolve in 25 cm3 of water at different temperatures.

The table shows the student's results. One of the results is anomalous.

Table for Question 6 — Edexcel IGCSE Chemistry

Question (a)

(a)

Plot the results on the grid.

[ 1 ]

Question (b)

(b)

Draw a circle around the anomalous result.

[ 1 ]

Question (c)

(c)

Ignoring the anomalous result, draw a curve of best fit.

Figure for Question (c) — Edexcel IGCSE Chemistry
[ 1 ]

Question (d)

(d)

Use your graph to find the maximum mass of potassium nitrate that dissolves in 25 cm325 \mathrm{~cm}^{3} of water at 75∘C75^{\circ} \mathrm{C}.

Show on your graph how you obtained your answer.
mass = g

[ 2 ]

Question 7

[Maximum number: 2]

A student investigates the solubility of potassium nitrate in water.
She measures the masses of potassium nitrate that dissolve in 25 cm3 of water at different temperatures.

The table shows the student's results. One of the results is anomalous.

Table for Question 7 — Edexcel IGCSE Chemistry

Suggest two possible mistakes that could have caused the anomalous result.

1

2

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