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0
votes
Compound C was used to prepare a potassium soap.
answered
Jun 22, 2021
in
Chemistry Form 4
soaps
salts
0
votes
Analysis of a river water sample showed the presence of the following ions Ca2+, Na+, Cl− , NO3−.
answered
Jun 22, 2021
in
Chemistry Form 4
acids
bases
salts
hardness of water
0
votes
Water containing hydrogen carbonate, HCO3− and calcium Ca2+ ions, is said to be hard water
answered
Jun 22, 2021
in
Chemistry Form 4
acids
bases
salts
hardness of water
0
votes
The table gives standard reduction potentials for some half cells.
answered
Jun 22, 2021
in
Chemistry Form 4
electrochemistry
organic chemistry
0
votes
The table shows the elements in period 3 of the periodic table. Study it and answer the questions that follow.
answered
Jun 22, 2021
in
Chemistry Form 4
metals
metals and non-metals
periodic table
0
votes
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.
answered
Jun 22, 2021
in
Chemistry Form 3
metals
iron
0
votes
Figure 15 shows a setup used to study Brownian motion in liquids.
answered
Jun 22, 2021
in
Physics Form 1
nature of matter
matter
brownian motion
liquids
0
votes
Define cohesive forces.
answered
Jun 22, 2021
in
Physics Form 1
force
0
votes
One of the ores of iron is haematite, Fe2O3. Give the name and formula of two other ores of iron.
answered
Jun 21, 2021
in
Chemistry Form 4
metals
0
votes
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.
answered
Jun 21, 2021
in
Chemistry Form 3
nitrogen and its compounds
moles
0
votes
One of the reactions in the manufacture of nitric(V) acid involves catalytic oxidation of ammonia as shown in the equation.
answered
Jun 21, 2021
in
Chemistry Form 4
nitrogen and its compounds
reaction rates and reversible reactions
0
votes
Dichromate(VI) ions are orange in colour while chromate(VI) ions are yellow. Consider the following equilibrium.
answered
Jun 21, 2021
in
Chemistry Form 4
reaction rates and reversible reactions
0
votes
State what is meant by the term 'dynamic equilibrium.
answered
Jun 21, 2021
in
Chemistry Form 1
reaction rates and reversible reactions
0
votes
In the laboratory, methane can be prepared from salts of alkanoic acids. Describe how methane is prepared from sodium ethanoate.
answered
Jun 21, 2021
in
Chemistry Form 3
organic chemistry
0
votes
The main component in natural gas is methane. Describe how methane in natural gas is formed.
answered
Jun 21, 2021
in
Chemistry Form 3
organic chemistry
0
votes
Incomplete combustion of pentane may result in air pollution. Write an equation to illustrate this combustion.
answered
Jun 21, 2021
in
Chemistry Form 3
organic chemistry
0
votes
Draw and name two isomers of pentane
answered
Jun 21, 2021
in
Chemistry Form 3
organic chemistry
0
votes
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.
answered
Jun 21, 2021
in
Chemistry Form 3
organic chemistry
0
votes
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.
answered
Jun 21, 2021
in
Physics Form 1
force
0
votes
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.
answered
Jun 21, 2021
in
Physics Form 4
electronics
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