Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
States of Matter
102 practice questions
Topics covered
Practice questions
71–80 of 102
Question 71
3 marks · Normal
Answer and see the solution →The following terms are commonly used in describing solutions:
(a)Define the following terms:
(i) solvent
(ii) solute
(iii) saturated solution
(i)[1 mark]solvent
(ii)[1 mark]solute
(iii)[1 mark]saturated solution
Question 72
4 marks · Normal
Answer and see the solution →The table below shows the solubility of two salts in water at different temperatures.
Solubility data for Salt X and Salt Y in water Temperature (°C) Solubility of Salt X (g/100g water) Solubility of Salt Y (g/100g water) 20 32 13 40 44 19 60 56 25 80 68 31 (a)[4 marks]On the axes below, plot the solubility curves for Salt X and Salt Y using the data from the table.
Use a suitable scale and label both curves clearly.
Question 73
2 marks · Hard
Answer and see the solution →State the difference between a solution and a saturated solution, as used in chemistry.
Question 74
5 marks · Hard
Answer and see the solution →The solubility curves below show the solubility of salt X and salt Y in water at different temperatures.
Solubility of Salts X and Y in Water (a)[1 mark]State which salt is more soluble in water at 30°C.
(b)[1 mark]Calculate the difference in solubility between salt X and salt Y at 60°C.
(c)[2 marks]Describe how the solubility of each salt changes as the temperature increases from 10°C to 70°C.
(d)[1 mark]Explain why it is important to use the same amount of water when measuring the solubility of different salts.
Question 75
2 marks · Hard
Answer and see the solution →Describe one safety precaution and one step to ensure accuracy when carrying out a solubility experiment for a solid in water.
Question 76
1 mark · Easy
Answer and see the solution →State the equation used to calculate the solubility (in g per 100 g of water) from the mass of solute and mass of solvent.
Question 77
3 marks · Easy
Answer and see the solution →The table below shows the solubility of calcium nitrate at various temperatures.
Solubility of calcium nitrate at different temperatures Temperature /°C Solubility /g per 100 g water 10 129 30 136 50 145 70 151 90 156 (a)[2 marks]Draw a labelled solubility curve for calcium nitrate using the data.
(b)[1 mark]State the dependent variable on the graph.
Question 78
2 marks · Easy
Answer and see the solution →Use the solubility curve for potassium bromide (KBr) below to determine the solubility at 60°C.
Incomplete solubility curve for potassium bromide Question 79
2 marks · Easy
Answer and see the solution →Explain, using a solubility curve, how you would determine how much solid potassium sulfate would crystallise from a saturated solution as it cools from 70°C to 30°C.
Question 80
3 marks · Easy
Answer and see the solution →A student performed an experiment to measure the solubility of sodium nitrate. Her results are:
Experimental data for sodium nitrate solubility Mass of evaporating dish (g) Mass of dish + solution (g) Mass of dish + dry sodium nitrate (g) 22.00 60.00 32.50 (a)[1 mark]Calculate the mass of sodium nitrate dissolved in the solution.
(b)[1 mark]Calculate the mass of water in the solution.
(c)[1 mark]Calculate the solubility of sodium nitrate in g per 100 g of water.