Question Constellation Sign up for free AQA · GCSE · Chemistry
Chemical analysis
02.3 · 2 marks Oxygen gas identification test Describe the test for oxygen gas. Give the result if oxygen gas is present. 04.1 · 2 marks Chromatography dye separation distances Explain why the yellow dye and red dye travel different distances in Experiment 1. Refer to forces of attraction between the... 04.2 · 3 marks Solvent effects on chromatography The student used the same type of chromatography paper in Experiment 1 and in Experiment 2. Explain why the yellow dye is in... 04.3 · 2 marks Dye purity comparison by chromatography Compare the purity of the orange dyes A and B. Give reasons for your answer. Use Figure 4 and Figure 5. 04.4 · 3 marks Chromatography solvent-front distance calculation The student calculated that the Rf value of the orange dye in the experiment shown in Figure 5 was 0.48. Calculate the distance... 04.5 · 1 mark Rf ratio and solvent distance Why is the Rf value of a dye not affected by how far the solvent front is allowed to travel? 04.6 · 2 marks Gas chromatography method advantages Suggest two advantages of using the instrumental method of gas chromatography rather than paper chromatography. 07.1 · 2 marks Sulfate ion precipitation test Sulfuric acid contains sulfate ions. Describe the test for the presence of sulfate ions in sulfuric acid. Give the result of the...
AQA · GCSE · Chemistry
The rate and extent of chemical change
02.4 · 2 marks Catalysed reaction profile construction Complete the reaction profile for the catalysed reaction in Figure 2. Label the activation energy. Label the reactants and... 02.5 · 1 mark Catalyst effect on reaction profile How would Figure 2 be different if no catalyst was used? Tick one box. 03.1 · 2 marks Hydrogen combustion reaction classification Hydrogen gas reacts with oxygen gas to produce water. Water is decomposed into hydrogen gas and oxygen gas using electricity.... 03.2 · 1 mark Dynamic equilibrium reaction description Which sentence describes this reaction at equilibrium? Tick one box. 07.2 · 1 mark Forward reaction energy profile Which statement about the forward reaction is correct? Use Figure 7. Tick one box. 07.3 · 2 marks Pressure effect on equilibrium yield Explain why the percentage yield of sulfur trioxide in this reaction is greater if the pressure is higher. 07.4 · 2 marks Industrial equilibrium pressure compromise In industry, the reaction is done at 450 °C and atmospheric pressure. Under these conditions the yield of sulfur trioxide is 86%...
AQA · GCSE · Chemistry
Using resources
02.6 · 1 mark Ammonium nitrate uses Suggest one use of ammonium nitrate. 06.2 · 2 marks Aluminium alloy corrosion resistance Explain why aluminium alloy bicycle frames do not need protection from corrosion. 06.3 · 1 mark Bicycle chain rust prevention Bicycle chains are made from an alloy of iron. Bicycle chains rust without protection. Paint is not used to protect bicycle... 06.4 · 2 marks Composite material component roles Bicycle frames can also be made from a composite of carbon fibres embedded in a polymer resin. What description is given in this...
AQA · GCSE · Chemistry
Chemistry of the atmosphere
05.1 · 2 marks Nitrogen oxide formation during combustion Explain how oxides of nitrogen are produced when burning fuels. 05.2 · 2 marks Hydrogen fuel environmental benefits Explain one positive impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2. 05.3 · 2 marks Hydrogen fuel environmental drawbacks Explain one negative impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2.
AQA · GCSE · Chemistry
Quantitative chemistry
AQA · GCSE · Chemistry