AQA Chemistry Past Paper Questions

hannah ruskin
Flashcards by hannah ruskin, updated more than 1 year ago
hannah ruskin
Created by hannah ruskin almost 5 years ago
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Here are some AQA Chemistry Past Paper Questions from the AQA GCSE Exam Board for anyone doing the GCSE soon.
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Metals are extracted from their ores. Many copper ores contain only 2% of copper compounds. Copper is now extracted from ores containing a low percentage of copper compounds. Suggest two reasons why Copper / ores are running out/ harder to find There are no / very small amounts of high grade copper ores left
Suggest one reason why it is difficult to dispose of the waste rock. Waste rock takes up a lot of space
The reaction in the furnace could cause environmental pollution. Explain how. Copper sulfide reacts with oxygen to produce sulfur dioxide / SO2 that causes acid rain
The extraction of pure copper is expensive. Give one reason why. large amounts of fuels / energy used (for the furnace and electrolysis) The extraction has many steps
Pure copper is produced by electrolysis of copper sulfate solution. Which electrode do the copper ions move towards? Give a reason for your answer Copper ions move towards the negative electrode / cathode because copper ions are positively charged or are oppositely charged or copper ions need to gain electrons
Name the type of reaction that releases energy from a fuel. Exothermic/Combustion
Fuels react with oxygen to produce carbon dioxide. The reaction of a fuel with oxygen can produce a different oxide of carbon. Name this different oxide of carbon and explain why it is produced. carbon monoxide / CO (is produced) because there is incomplete / partial combustion (of the fuel)
Alloys are used to make the ballpoint pen. Give two reasons why alloys are used in the ballpoint pen. hard / strong / durable resistant to corrosion or unreactive
Describe, in terms of molecules, how poly(ethene) is produced. Many monomers or many ethene molecules join / bond OR monomers / ethene molecules form chains or very large molecules
Hydrocarbons and calcium carbonate contain locked up carbon dioxide. What is locked up carbon dioxide? Carbon dioxide from the air / Earth’s early atmosphere formed sedimentary rocks or fossil fuels
Describe Wegener’s idea of how Earth’s continents formed. continents were joined together the continents then drifted apart or moved apart
Describe how the process of fermentation is done. sugar is mixed with / dissolved in water and yeast is added.
Carbon neutral fuels do not increase the amount of carbon dioxide in the atmosphere. Suggest why using a biofuel, such as ethanol or rapeseed oil, is thought to be carbon neutral. Growing sugar cane / rapeseed plants absorbs carbon dioxide which is released when the biofuel burns
When any fuel from the table is used in a car engine, the exhaust gases contain nitrogen oxides. Explain why. nitrogen / N2 and oxygen / O2 (in the air) react in the hot engine / at high temperature
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