Aqa Gcse Chemistry Paper 2 Study Guide Questions And Correct Answers

What is the stationary phase in paper chromatography? {Ans: Is contained in the paper and does not move through it}Name three greenhouse gases {Ans: Water vapour, carbon dioxide and methane}Name two ways of extracting copper from low-grade ores {Ans: Phytomining and bioleaching}What is a reversible reaction? {Ans: Where the products of a chemical reaction can react to produce the original reactants}What is the problem with opinions voiced on the climate change? {Ans: Based on simple models, speculation, only part of the evidence and there are issues with bias}Describe the bioleaching process of copper extraction {Ans: Bacteria are used to produce leachate solutions that contain metal compounds}Why do we not know the composition of the Earth's early atmosphere? {Ans: Evidence is limited because of the time scale of 4.6 billion years}What is a composite material? {Ans: A material made up of two materials with different properties}Name three ways of preventing corrosion by adding a protective coating? {Ans: Greasing, painting or electroplating}What are steels? {Ans: Alloys of iron that contain specific amounts of carbon and other metals}