Crude oil is separated into fractions in a fractionating column.
Explain how fractional distillation separates crude oil into fractions.
[6 marks]Edexcel GCSE Chemistry June 2025 Paper 2F
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]Aluminium oxide is an ionic compound. It contains and ions.
.1
Write the formula of aluminium oxide.
[1 mark].2
Describe the structure of aluminium oxide.
[3 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]Silicon dioxide (silica) melts at 1710 °C. Poly(ethene) softens at about 120 °C. Methane boils at −162 °C.
Explain the differences in these temperatures.
Refer to the structure and bonding of each substance.
[6 marks]