Chemistry Paper 2 GCSE AQA
Foundation
What is a Catalyst? - Answer Increases rate of reaction and reusable
What percentages are the gases in today's atmosphere for oxygen, Nitrogen, Vapour,
carbon dioxide? - Answer Oxygen- 20%, Nitrogen- 79%, Vapour- 1%, Carbon dioxide-
less than 1%
What is the equation for Photosynthesis? - Answer carbon dioxide + water = Oxygen +
glucose
Why do countries have problems to reduce carbon dioxide emissions? - Answer
Disagreement between countries and the resources are underdeveloped
What is Filtration? - Answer Where you separate a mixture from filtering another mixture
What is Electrolysis? - Answer Electrolysis is a technique that uses a direct electric
current to drive an chemical reaction
What is Distillation? - Answer the action of purifying a liquid by a process of heating and
cooling.
What is Crystallisation? - Answer When a product is made as a solution, one way to
separate it from the solvent is to make crystals. This involves evaporating the solution to
a much smaller volume and then leaving it to cool.
How is Fuel different from Crude Oil? - Answer Fuel is a compound and crude oil is a
mixture,
How do you create drinking water from rivers and lakes? - Answer By Desalination and
sterilisation
Why is Soot Formed? - Answer Because there is not enough oxygen
How do you calculate the rate of a reaction? - Answer Quantity of the reactant used
divided by time taken
What are the units of rate? - Answer In grams or volume in cm cubed
What is the symbol for a reversible reaction? - Answer
Where are products and reactants in an equation? - Answer
What is Crude Oil? - Answer Crude oil is a mixture of a very large number of
compounds. Most of the compounds in crude oil are hydrocarbons, which are molecules
made up of hydrogen and carbon atoms only.
Foundation
What is a Catalyst? - Answer Increases rate of reaction and reusable
What percentages are the gases in today's atmosphere for oxygen, Nitrogen, Vapour,
carbon dioxide? - Answer Oxygen- 20%, Nitrogen- 79%, Vapour- 1%, Carbon dioxide-
less than 1%
What is the equation for Photosynthesis? - Answer carbon dioxide + water = Oxygen +
glucose
Why do countries have problems to reduce carbon dioxide emissions? - Answer
Disagreement between countries and the resources are underdeveloped
What is Filtration? - Answer Where you separate a mixture from filtering another mixture
What is Electrolysis? - Answer Electrolysis is a technique that uses a direct electric
current to drive an chemical reaction
What is Distillation? - Answer the action of purifying a liquid by a process of heating and
cooling.
What is Crystallisation? - Answer When a product is made as a solution, one way to
separate it from the solvent is to make crystals. This involves evaporating the solution to
a much smaller volume and then leaving it to cool.
How is Fuel different from Crude Oil? - Answer Fuel is a compound and crude oil is a
mixture,
How do you create drinking water from rivers and lakes? - Answer By Desalination and
sterilisation
Why is Soot Formed? - Answer Because there is not enough oxygen
How do you calculate the rate of a reaction? - Answer Quantity of the reactant used
divided by time taken
What are the units of rate? - Answer In grams or volume in cm cubed
What is the symbol for a reversible reaction? - Answer
Where are products and reactants in an equation? - Answer
What is Crude Oil? - Answer Crude oil is a mixture of a very large number of
compounds. Most of the compounds in crude oil are hydrocarbons, which are molecules
made up of hydrogen and carbon atoms only.
