Explain what is meant by electrolysis
_
Describe the test to show that a gas is chlorine
_
Write the balanced equation for the reaction of silver nitrate solution, AgNO3
,
with dilute hydrochloric acid to form silver chloride, AgCl, and nitric acid
_
Alkenes are unsaturated hydrocarbons.
State what is meant by unsaturated.
_
Propane and propene are bubbled through separate samples of bromine water.
Describe what you would see in these tests
_
In industry, long chain hydrocarbon molecules are cracked to form shorter chain
hydrocarbon molecules.
Explain why this process is important.
_
The percentage of carbon dioxide in the Earth’s atmosphere today is less than
that in the Earth’s earliest atmosphere.
Explain what has caused the percentage of carbon dioxide to decrease.
_
Carbon dioxide and other gases in the atmosphere help to keep the Earth
warm.
State how these gases keep the Earth warm
_
Describe the test to show that a gas is oxygen
_
Metal oxides react with acids to produce salts and water.
Dilute sulfuric acid was added to magnesium oxide.
State the name of the salt formed.
_
Explain what you understand by the term alloy
_
Explain, in terms of their structures, why magnalium is stronger than pure
aluminium.
_
Limestone is a natural form of calcium carbonate.
Explain why calcium carbonate can be used to treat waste gases produced in
coal-fired power stations.
_
If calcium carbonate is heated strongly it decomposes to calcium oxide and
carbon dioxide.
Write the balanced equation for this reaction.
_
The formula of a molecule of propene is C3
H6
.
Draw the structure of a molecule of propene, showing all covalent bonds.
_
Methane burns in oxygen to form carbon dioxide and water.
Write the balanced equation for this reaction
_
Natural gas is mainly methane.
A gas with similar composition, known as bio-methane, can be produced from
plants grown specifically for this purpose.
Describe the advantages and disadvantages of using bio-methane rather than
natural gas as a source of energy.
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