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Water containing hydrogen carbonate, HCO3− and calcium Ca2+ ions, is said to be hard water
asked
Jun 22, 2021
in
Chemistry Form 4
acids
bases
salts
hardness of water
0
votes
1
answer
The table gives standard reduction potentials for some half cells.
asked
Jun 22, 2021
in
Chemistry Form 4
electrochemistry
organic chemistry
0
votes
1
answer
The table shows the elements in period 3 of the periodic table. Study it and answer the questions that follow.
asked
Jun 22, 2021
in
Chemistry Form 4
metals
metals and non-metals
periodic table
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
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
metals
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
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
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
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
reaction rates and reversible reactions
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
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
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
organic chemistry
0
votes
1
answer
Draw and name two isomers of pentane
asked
Jun 21, 2021
in
Chemistry Form 3
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
organic chemistry
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
force
0
votes
1
answer
A step down transformer has 600 turns in the primary coil. The input voltage is 120 V while the output voltage is 24 V. Determine the number of turns in the secondary coil.
asked
Jun 21, 2021
in
Physics Form 4
electronics
0
votes
1
answer
State how eddy currents are minimised in a transformer.
asked
Jun 21, 2021
in
Physics Form 1
electrostatics
0
votes
1
answer
Figure 8 shows two straight conductors P and Q connected to a battery and a variable resistor.
asked
Jun 21, 2021
in
Physics Form 1
magnetism
electricity
magnetic effect of electric currents
0
votes
1
answer
Figure 7 shows a soft iron ring placed between the poles of two bar magnets.
asked
Jun 21, 2021
in
Physics Form 2
magnetism
0
votes
1
answer
Figure 6 shows a graph of stopping potential against the frequency for a certain photo emissive surface, drawn by a student from the data collected when carrying out an experiment on photoelectric effect.
asked
Jun 21, 2021
in
Physics Form 4
photoelectric effect
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