Crude oil is separated into fractions in a fractionating column.
Explain how fractional distillation separates crude oil into fractions.
[6 marks]OCR Gateway GCSE Chemistry June 2023 Paper 2
5 questions on this paper's topics
32:001 of 5
The table shows the boiling points of some noble gases.
| Noble gas | Boiling point in °C |
|---|---|
| Helium | −269 |
| Neon | −246 |
| Argon | −186 |
| Krypton | ? |
| Xenon | −108 |
.1
Estimate the boiling point of krypton.
[1 mark].2
Describe the trend in boiling point down the group.
[1 mark].3
Explain why the noble gases are unreactive.
[2 marks]A student investigates how the concentration of hydrochloric acid affects the rate of its reaction with magnesium ribbon. Hydrogen gas is produced.
Plan an investigation using a gas collection method.
Include the variables the student should control.
[6 marks]Sodium chloride solutions are used in hospitals.
.1
0.80 g of sodium chloride is dissolved in water to make 40 cm³ of solution. Calculate the concentration in g/dm³.
[2 marks].2
A nurse needs 250 cm³ of a solution with a concentration of 9.0 g/dm³. Calculate the mass of sodium chloride needed.
[3 marks]A student wants to make pure, dry crystals of copper sulfate from copper oxide (an insoluble black powder) and dilute sulfuric acid.
Plan a method the student could use.
In your answer, explain the reason for each step.
[6 marks]