Flashcards
AQA Chemistry Past Paper Questions
Flashcards do conjunto (14)
- 1Metals 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 whyCopper / ores are running out/ harder to find
There are no / very small amounts of high grade copper ores left - 2Suggest one reason why it is difficult to dispose of the waste rock.Waste rock takes up a lot of space
- 3The reaction in the furnace could cause environmental pollution. Explain how.Copper sulfide reacts with oxygen to produce sulfur dioxide / SO2
that causes acid rain - 4The 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 - 5Pure copper is produced by electrolysis of copper sulfate solution. Which electrode do the copper ions move towards? Give a reason for your answerCopper ions move towards the
negative electrode / cathode
because copper ions are
positively charged or are
oppositely charged or copper ions
need to gain electrons - 6Name the type of reaction that releases energy from a fuel.Exothermic/Combustion
- 7Fuels 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) - 8Alloys 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 - 9Describe, 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 - 10Hydrocarbons 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 - 11Describe Wegener’s idea of how Earth’s continents formed.continents were joined together
the continents then drifted apart
or moved apart - 12Describe how the process of fermentation is done.sugar is mixed with / dissolved in
water and yeast is added. - 13Carbon 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 - 14When 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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- Here are some AQA Chemistry Past Paper Questions from the AQA GCSE Exam Board for anyone doing the GCSE soon.
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- hannah ruskin
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