Human activities have increased the concentrations of greenhouse gases in the atmosphere.
Explain how human activities are likely to be causing global climate change, and describe two possible effects of climate change.
[6 marks]AQA GCSE Combined Science June 2023 Chemistry Paper 2F
5 questions on this paper's topics
30:001 of 5
A faulty gas heater burns methane in a limited supply of air.
.1
Which two substances could form from incomplete combustion but not from complete combustion? Tick two boxes.
[2 marks].2
Explain why carbon monoxide from a faulty heater is dangerous.
[2 marks]A student has samples of tap water, sea water and rain water.
Plan an investigation to compare the pH and the mass of dissolved solids in the three samples, and to purify the sea water by distillation.
[6 marks]A student wants to find out whether a green food colouring contains the same dyes as two known dyes, P and Q.
.1
Describe how the student could use paper chromatography to do this.
[4 marks].2
A spot moves 3.9 cm from the start line. The solvent front is 7.8 cm from the start line. Calculate the Rf value.
[2 marks]Crude oil is separated into fractions in a fractionating column.
Explain how fractional distillation separates crude oil into fractions.
[6 marks]