Chemistry Revision

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  • Created by: pvibrans
  • Created on: 20-05-15 18:40
Balance the symbol equation for this reaction. Cu2S + …..O2 --> ….CuO + SO2
2, 2
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Explain why there would be an environmental problem if the gas from this reaction were allowed to escape into the atmosphere.
The sulfur dioxide could cause acid rain which is poisonous.
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In the second stage, copper oxide (CuO) is reduced using carbon. Describe and explain what happens during this reaction.
Carbon is more reactive than copper, so the copper oxide is heated with carbon to make copper and carbon dioxide. The carbon is oxidised and the copper is reduced.
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During the third stage the copper can be purified. What is the name of the type of process used for this purification?
electrolysis.
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Give one use for purified copper.
for water pipes.
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Recycling copper may be better than extracting copper from its ores. Why?
It is cheaper and we use less fossil fuels. Less mining, less resources and less waste in landfills. Less pollution.
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Outline the process of phytomining and explain why it has become important.
Plants are grown in areas with low grade ores. The plants absorb the minerals through their roots. We can burn the plants and add sulfuric acid to their ashes. We then use electrolysis to get the metal. We can keep on growing the plant.
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Write a word equation for the reaction of potassium with water.
potassium + water --> potassium hydroxide + hydrogen
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Write a word equation for the reaction of magnesium with dilute hydrochloric acid.
magnesium + dilute hydrochloric acid --> magnesium chloride + hydrogen.
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What is an ore?
An ore is a rock containing enenough metal compound to be economical to extract/worth extracting.
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Some metals are obtained by removing oxygen from the metal oxide. What name do we give to his chemical reaction?
Reduction reactions.
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Name one metal which must be extracted from its melted ore by electrolysis rather than using carbon.
Aluminium.
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Using carbon, why would you be able to extract lead from lead oxide but not aluminium from aluminium oxide?
Carbon is more reactive than lead so it removes the oxygen from lead to make carbon dioxide and lead. But carbon is not more reactive than aluminium so it could not displace it meaning there was no reaction.
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Complete this word equation for the reaction between lead oxide and carbon. lead oxide + carbon --> ...........+............
lead oxide + carbon --> lead + carbon dioxide
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Describe what happens when lithium reacts with water.
It floats, it moves about on the water and it fizzes.
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Describe a simple test and the result that would show the gas was hydrogen.
Lit splint gives squeaky pop.
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crude oil is a mixture of many different _______. We can separate crude oil into many different ______ using ________. Hydrocarbon molecules with many carbon atoms tend to have a ____ boiling point and ________ and don't catch fire _____.
mixture, fractions, fractional distillation, high, viscosity, easily.
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Give the name of the alkane with 1 Carbon atom and 4 Hydrogen atoms.
Methane.
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Give the name of the alkane with 2 Carbon atom and 6 Hydrogen atoms.
Ethane.
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Give the name of the alkane with 3 Carbon atom and 8 Hydrogen atoms.
Propane.
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Explain how we can separate crude oil.
Crude oil is a mixture of hydrocarbons. We can separate it into fractions using fractional distillation. Each fraction contains hydrocarbon molecules with a similar number of carbon atoms and a similar boiling point.
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Explain how we can separate crude oil (2)
The crude oil is heated to evaporate it and its vapours condense at different temperatures in the column. Hydrocarbons with big molecules condense at the bottom where its hot and the small molecules condense at the top where its cool.
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How does the number of carbon atoms in a hydrocarbon affect its boiling point and viscosity?
The more carbon atoms the higher the boiling point and the thicker the hydrocarbon.
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Why do the fractions have boiling ranges and not boiling points?
Because it's a mixture of molecules which all have similar but different boiling points.
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Give the meaning of the state symbols (g) and (aq)
gas and aqueous solution.
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Explain why gold, platinum and silver are found mainly as the metals themselves in the Earth.
Because it is so unreactive.
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Other cards in this set

Card 2

Front

Explain why there would be an environmental problem if the gas from this reaction were allowed to escape into the atmosphere.

Back

The sulfur dioxide could cause acid rain which is poisonous.

Card 3

Front

In the second stage, copper oxide (CuO) is reduced using carbon. Describe and explain what happens during this reaction.

Back

Preview of the front of card 3

Card 4

Front

During the third stage the copper can be purified. What is the name of the type of process used for this purification?

Back

Preview of the front of card 4

Card 5

Front

Give one use for purified copper.

Back

Preview of the front of card 5
View more cards

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