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. 07.1 · 2 marks Reversible reactions reaching equilibrium Describe how a reaction reaches equilibrium. Nitrogen dioxide gas reacts to form dinitrogen tetraoxide gas. The reaction is...

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? 01.1 · 1 mark Balancing propane combustion Balance the equation for the combustion of propane. C3H8 + O2 → 3 CO2 + 4 H2O 01.5 · 3 marks Testing for an alkene Propene is an alkene. Describe the test for alkenes. Give the colour change in the test. Test Colour change to 07.1 · 4 marks Separating crude oil into fractions Hydrocarbon fuels are produced from crude oil. Describe how crude oil is separated into fractions. Butane is a hydrocarbon.

AQA · GCSE · Chemistry

Chemical analysis

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

Quantitative chemistry

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.... 01.5 · 3 marks Solution concentration calculation A solution of hydrochloric acid contains 3.2 g of hydrogen chloride in 50 cm3 Calculate the concentration of hydrogen chloride... 08.3 · 5 marks Reacting mass calculation 0.120 g of magnesium reacts with excess iron chloride solution. Relative atomic masses (Ar): Mg = 24 Fe = 56 Calculate the mass...

AQA · GCSE · Chemistry

Energy changes

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

Bonding, structure, and the properties of matter

04.3 · 3 marks Steel and iron hardness Explain why steel is harder than iron. 04.1 · 1 mark State symbol for chlorine at room temperature Write the state symbol for chlorine at room temperature. Cl2 ( )

AQA · GCSE · Chemistry

Chemical changes

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

Atomic structure and the periodic table

06.3 · 5 marks Reacting mass calculation Gold reacts with the elements in Group 7 of the periodic table. 0.175 g of gold reacts with chlorine. The equation for the...