Some metals are added to solutions of metal sulfates.
.1
Which two mixtures react? Tick two boxes.
[2 marks].2
Explain, in terms of ions, why magnesium is more reactive than zinc.
[2 marks]OCR Gateway GCSE Combined Science June 2024 Paper 4
5 questions on this paper's topics
29:001 of 5
Group 1 and group 7 elements both show trends in reactivity.
Reactivity increases down group 1 but decreases down group 7.
Explain these two trends in terms of electrons.
[6 marks]When ammonium chloride is heated it decomposes into ammonia and hydrogen chloride. On cooling, they react to form ammonium chloride again.
.1
The forward reaction takes in 176 kJ for each mole of ammonium chloride. Give the energy released when one mole of ammonium chloride forms from ammonia and hydrogen chloride.
[1 mark].2
Explain why ammonium chloride reforms at the cool top of a test tube when it is heated at the bottom.
[2 marks]Crude oil is separated into fractions in a fractionating column.
Explain how fractional distillation separates crude oil into fractions.
[6 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]