Question Constellation Sign up for free AQA · GCSE · Chemistry
Bonding, structure, and the properties of matter
01.5 · 1 mark State symbol in a chemical equation What is the state symbol (x) in the equation? Tick (✓) one box. (aq) (g) (l) (s) 05.3 · 4 marks Adding other metals to aluminium An alloy of aluminium contains small amounts of other metals. Explain why other metals are added to aluminium. 04.3 · 3 marks Steel and iron hardness Explain why steel is harder than iron.
AQA · GCSE · Chemistry
Chemical analysis
02.4 · 2 marks Chromatography Rf value calculation In a chromatography experiment, a blue colour moved 4.77 cm. The solvent moved 5.30 cm. Calculate the Rf value for the blue... 01.4 · 3 marks Using Rf to find solvent distance A student calculated the Rf value of a colour to be 0.24 The colour moved 1.8 cm from the start line. Calculate the distance the...
AQA · GCSE · Chemistry
Energy changes
04.5 · 1 mark Temperature and equilibrium position The reaction is at equilibrium. The reaction is exothermic. What happens to the equilibrium position when the temperature is... 06.6 · 2 marks Temperature and ammonia yield The forward reaction to produce ammonia is exothermic. Explain the effect of increasing the temperature on the yield of ammonia.... 06.6 · 2 marks Temperature and equilibrium yield The forward reaction is exothermic. Explain the effect of increasing the temperature on the yield of ammonia gas produced at...
AQA · GCSE · Chemistry
Chemical changes
06.4 · 2 marks Concentration changes on the pH scale The concentration of hydrochloric acid is increased by a factor of 100 What is the change in pH? 01.2 · 1 mark Separating copper carbonate from a mixture How can the excess copper carbonate be removed? 04.8 · 1 mark Concentration changes on the pH scale A solution of hydrochloric acid had a hydrogen ion concentration of 1.0 mol/dm3 Water was added to the hydrochloric acid until...
AQA · GCSE · Chemistry
Quantitative chemistry
02.5 · 3 marks Scaling solution mass by volume The potassium sulfate solution has 0.86 g of potassium sulfate dissolved in 25 cm3 of water. Calculate the mass of potassium... 02.3 · 3 marks Solution concentration calculation The salty water contains sodium chloride. The scientist collected 2.40 g of sodium chloride from 150 cm3 of salty water....
AQA · GCSE · Chemistry
The rate and extent of chemical change
06.4 · 2 marks Reversible reactions reaching equilibrium Describe how a reversible chemical reaction is able to reach equilibrium. 06.5 · 2 marks Pressure and equilibrium yield Explain the effect of increasing the pressure on the yield of ammonia. 07.2 · 2 marks Pressure and equilibrium position Explain the effect on the equilibrium position of increasing the pressure.
AQA · GCSE · Chemistry
Organic chemistry
04.2 · 1 mark Meaning of hydrocarbon What is a hydrocarbon? Large hydrocarbon molecules are cracked. 04.3 · 2 marks Balancing a cracking reaction When C11H24 is cracked, three products are formed. Complete the equation for the reaction. C11H24 → C5H10 + 2 + 02.5 · 2 marks Testing for an alkene C2H4 is an alkene. What is the test for alkenes? Give the result of the test if an alkene is present. Test Result 05.2 · 4 marks Crude oil: fractional distillation Describe how crude oil is separated into fractions by fractional distillation. 05.1 · 3 marks Formation of crude oil Describe how crude oil is formed. 01.3 · 1 mark Balancing a cracking reaction Propane can be cracked to produce propene and hydrogen. Complete the symbol equation for the reaction. C3H8 → + H2 propane... 05.3 · 1 mark General formula for alkanes What is the general formula for alkanes?
AQA · GCSE · Chemistry