Aqa 2017 route 2 science unofficial mark scheme Watch
SCIENCE ROUTE 2 AQA UNOFFICIAL MARK SCHEME | 2017
Question: Why do we need to develop new antibiotics?
Answer: So that they can cure new diseases.
Question: What happens when you heat Magnesium Carbonate. Also name the reaction.
Answer: You get Magnesium Oxide + Carbon Dioxide _ Reaction = Thermal Decomposition.
Question: Two Gases which have an impact on the environment?
Answer: Sulfur Dioxide produces Acid Rain which destroys limestone buildings. Carbon Dioxide which produces carbon particulates of soot.
Question: Fractional Distillation of Kerosene?
Answer: First you Kerosene up and it vaporises into a gas and then you pipe it all the way down to the bottom of the fractionating column and then it rises up with different boiling points and lastly it condenses back into a liquid.
Question: Name FOUR reason why Heater A is better than Heater B?
Answer: Heater has more power, protective when overheating, can be mounted on to the wall.
Question: Convection Currents?
Answer: Heated Air rises and becomes less dense and then it rises and becomes denser and then it falls down as cool air.
Question: Before Petrol is burnt, what is removed?
Question: Describe Solids, Liquids and Gases?
Answer: Solid are dense and have a regular arrangement. Liquids have less dense than Gases, the particles take the shape of the container. Gases have the most energy, they float everywhere.
Question: Work out how many hydrogens it has. Just use the formula CnH2n+2
Question: Sankey Diagram - Work out Useful Efficiency?
Answer: Total Energy was 20 and the useful energy was 7. So it was 7 divided by 20 which equals to 0.35. *I don't know if you had to times it by 100 to give you a percentage.
Question: Some of the energy is not usefully transferred.
What happens to the energy which is not usefully transferred and what effect does this have?
Answer: Lost in the surroundings.
Question: Fill in the blanks:
Answer: Kinetic Theory.
Question: Advantage of using Biofuels rather than Fossil Fuels?
Answer: Renewable Resource and Saves money.
Question: Image of a pipe was show. Show how can you save heat transfer?
Answer: Gap between pipes must be tight so that less heat is lost. Also, used black as it is a good absorber and emitter.
Question: Copper is a good?
Answer: Good conductor of heat and electricity.
Question: Things you would change it to make it a better experiment?
Answer: Larger Sample size, use more than 30. (Describe the figures they have given you on the paper).
*IF I HAVE MISSED ANY QUESTIONS, PLEASE COMMENT THEM BELOW.