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votes
1
answer
Outline the differences between Quran and Hadith Qudsi
asked
Jun 21, 2021
in
IRE Form 3
by
Mohammed hamoud
0
votes
1
answer
Use the information in the Table to answer the questions that follow.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anony mous
alkanes
separation of mixtures
organic chemistry
miscibility
0
votes
1
answer
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.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
metals
iron
0
votes
1
answer
One of the ores of iron is haematite, Fe2O3. Give the name and formula of two other ores of iron.
asked
Jun 21, 2021
in
Chemistry Form 4
by
anonymous
metals
0
votes
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
0
votes
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
0
votes
1
answer
One of the reactions in the manufacture of nitric(V) acid involves catalytic oxidation of ammonia as shown in the equation.
asked
Jun 21, 2021
in
Chemistry Form 4
by
anonymous
nitrogen and its compounds
reaction rates and reversible reactions
0
votes
1
answer
Dichromate(VI) ions are orange in colour while chromate(VI) ions are yellow. Consider the following equilibrium.
asked
Jun 21, 2021
in
Chemistry Form 4
by
anonymous
reaction rates and reversible reactions
0
votes
1
answer
State what is meant by the term 'dynamic equilibrium.
asked
Jun 21, 2021
in
Chemistry Form 1
by
anonymous
reaction rates and reversible reactions
0
votes
1
answer
peroxide decomposition Sodium carbonate is prepared on large scale by the Solvay process. The equation for the main reaction that takes place in the carbonator is: NaCl(aq) + NH3(g) + CO2(g)+ H2O(l) → NH4Cl(aq) + NaHCO3(s)
asked
Jun 21, 2021
in
Chemistry Form 2
by
anony mous
solvay process
production of sodium carbonate
by-products
carbon
0
votes
1
answer
In the laboratory, methane can be prepared from salts of alkanoic acids. Describe how methane is prepared from sodium ethanoate.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
0
votes
1
answer
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
0
votes
1
answer
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
0
votes
1
answer
The Figure shows an energy level diagram for the decomposition of hydrogen peroxide using a catalyst
asked
Jun 21, 2021
in
Chemistry Form 4
by
anony mous
energy changes
energy level diagrams
chemical reactions
decomposition
0
votes
1
answer
Draw and name two isomers of pentane
asked
Jun 21, 2021
in
Chemistry Form 3
by
anonymous
organic chemistry
0
votes
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
0
votes
1
answer
Nitrogen(IV) oxide is prepared by heating lead(ll) nitrate.
asked
Jun 21, 2021
in
Chemistry Form 3
by
anony mous
nitrogen and its compounds
nitrogen (iv) oxide preparation
tests
chemical equation
0
votes
1
answer
Study the information in the table and answer the questions that follow. The elements belong to the same chemical family. (The letters are not actual symbols of the elements)
asked
Jun 21, 2021
in
Chemistry Form 2
by
anony mous
periodic table
metals and non-metals
pattern in properties
chemical family
0
votes
1
answer
A metallic box weighs 188N and measures 10cm by 30 cm by 8 cm. Determine the maximum pressure it can exert when lying on one of its surfaces.
asked
Jun 21, 2021
in
Physics Form 1
by
anonymous
force
0
votes
1
answer
Excess dilute hydrochloric acid was added to an alloy of copper and zinc in a beaker.
asked
Jun 21, 2021
in
Chemistry Form 4
by
anony mous
metals
zinc
properties of metals
alloys
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