Flashcards
Chemistry Unit 1 Revision
Cards in this deck (23)
- 1Crude oil is a mixture of many different hydrocarbons. What is meant by hydrocarbon?A compound containing only carbon and hydrogen.
- 2Describe and explain how petrol is separated from the mixture of hydrocarbons in the crude oil. (4-6 marks)The crude oil is heated up [1] so the liquids become evaporate[1], as they rise up the column they cool and condense [1], so they are separated by their boiling points [1].
- 3Many polymers are not biodegradable. What does biodegradable mean? (1 mark)Substances being decomposed by bacteria or other living organisms and thereby avoiding pollution.
- 4Why is there no overall electrical charge on an aluminium atom? (1 mark)number of protons is equal to
number of electrons
or
positive and negative
charges cancel out - 5Name the two sub-atomic particles in the nucleus (1 mark)Protons and Neutrons
- 6Why does aluminium react with iron oxide? (1 mark)Aluminium is more reactive (than iron).
- 7Copper is now extracted from ores containing a low percentage of copper compounds. Suggest two reasons why. (2 marks)copper metal is in demand [1]
copper is expensive [1] - 8The reaction in the furnace could cause environmental pollution. Explain how. (2 marks)Copper sulfide reacts with oxygen produce sulfur dioxide [1]
that causes acid rain [1] - 9The extraction of pure copper is expensive. Give one reason why. (1 mark)Large amounts of fuels/energy used (for the furnace and electrolysis
or
the extraction has many steps / stages / processes
or
Large amounts of ore/material have to be mined - 10Pure copper is produced by electrolysis of copper sulfate solution. Which electrode do the copper ions move towards? Give a reason for your answer. (2 marks)the
negative electrode/cathode [1]
[1] because copper ions / Cu2+ are
positively charged
or
are oppositely charged
or
copper ions need to gain electrons - 11Large areas of land are contaminated with copper compounds. Phytomining can be used to remove these copper compounds from the land. What is used in phytomining to remove copper compounds from the land? [1](Growing) plants
- 12Fuels react with oxygen to release energy. Name the type of reaction that releases energy from a fuel. (1 mark)Exothermic
or
Combustion
or
Burning
or
Oxidation
or
Redox - 13Fuels 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. (2 marks)Carbon monoxide [1]
because there is incomplete combustion [1] - 14Give two reasons why alloys are used in the ballpoint pen.hard / strong / durable [1]
resistant to corrosion or
unreactive [1] - 15What is locked up carbon dioxide? (2 marks)Carbon dioxide from Earth’s early atmosphere [1]
formed sedimentary rocks or
fossil fuels [1] - 16Describe Wegener’s idea of how Earth’s continents formed. (2 marks)There was a Pangaea [1]
continents then drifted apart [1] - 17Diesel is a mixture of lots of different alkanes. What are alkanes? (2 marks)hydrocarbons [1]
[1] alkanes are saturated
or
have
only single
bonds - 18Why does Iceland have volcanoes? (1 mark)on a boundary
between tectonic plates - 19Describe how volcanic activity led to the formation of oceans.Water vapour released by
volcanic activity [1]
condensed to form the oceans [1] - 20Calcium oxide reacts with a substance to produce calcium hydroxide. Name the substance. (1 mark)Water
- 21Calcium hydroxide reacts with a substance to produce calcium carbonate. Name the substance. (1 mark)Carbon dioxide
- 22Iron is extracted by heating a mixture of iron oxide and carbon in a blast furnace. Name this type of reaction. (1 mark)Reduction
- 23What is meant by electrolysis? ( 2 marks)decomposition of
compound [1]
using current/electricity [1]
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- AQA: Past paper exam questions
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