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In a certain factory, iron is extracted from the haematite ore using the blast furnace as shown in Figure 1. The other raw materials are coke, limestone and air. The melting and boiling points of iron are 1535°C and 3000 °C, respectively.
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Jun 21, 2021
in
Chemistry Form 3
by
anonymous
metals
iron
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1
answer
Some compounds such as CFCs and DDT are regarded as environmental pollutants. Give the complete names of
asked
Jun 21, 2021
in
Chemistry Form 3
by
anony mous
chlorine compounds
environmental pollution
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1
answer
A factory uses 100 kg of ammonia each day to produce 160 kg of nitrogen(II) oxide. Calculate the percentage yield of nitrogen(II) oxide.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
nitrogen and its compounds
moles
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1
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In the laboratory, methane can be prepared from salts of alkanoic acids. Describe how methane is prepared from sodium ethanoate.
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Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
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1
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The main component in natural gas is methane. Describe how methane in natural gas is formed.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
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1
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Incomplete combustion of pentane may result in air pollution. Write an equation to illustrate this combustion.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
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votes
1
answer
Draw and name two isomers of pentane
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Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
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1
answer
Crude oil is a mixture of hydrocarbons which are separated by fractional distillation. One of the components obtained contains an alkane A, with eleven carbon atoms.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
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1
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Nitrogen(IV) oxide is prepared by heating lead(ll) nitrate.
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Jun 21, 2021
in
Chemistry Form 3
by
anony mous
nitrogen and its compounds
nitrogen (iv) oxide preparation
tests
chemical equation
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1
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The Figure below shows a reaction scheme starting with copper turnings. Study it and answer the questions that follow
asked
Jun 21, 2021
in
Chemistry Form 3
by
anony mous
chemical reaction scheme
sulphur and its compounds
sulphuric acid properties
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votes
1
answer
The table shows pH values of solutions of compounds D, E. F and G
asked
Jun 21, 2021
in
Chemistry Form 3
by
anony mous
chlorine
nitrogen
compounds
amphoteric oxides
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1
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Draw the structural formula of 2-methylbut-2-ene.
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Jun 21, 2021
in
Chemistry Form 3
by
anony mous
structural formula
organic chemistry
alkenes
isomerism
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1
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Carbon(II) oxide was passed over 4.1g of heated oxide of copper in a combustion tube until there was no further change. The mass of the final substance was found to be 3.29g
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Jun 21, 2021
in
Chemistry Form 3
by
anony mous
the mole
molar mass
properties of carbon monoxide
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votes
1
answer
What is organic chemistry?
asked
Jun 20, 2021
in
Chemistry Form 3
by
Paul
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