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0
votes
Explain how you would show chemically that a given gas is ammonia.
answered
Aug 18, 2021
in
Chemistry Form 3
0
votes
A sample of air contaminated with carbon monoxide and sulphur dioxide was passed through the apparatus shown in the diagram below.
answered
Aug 18, 2021
in
Chemistry Form 2
carbon and its compounds
0
votes
Graphite is a non metal, yet it conduct an electric current .explain this observation.
answered
Aug 18, 2021
in
Chemistry
chemical families patterns in properties
0
votes
Graphite is a non metal, yet it conduct an electric current .explain this observation.
answered
Aug 18, 2021
in
Chemistry
chemical families patterns in properties
0
votes
The diagram below shoes the bonding between aluminium chloride and ammonia
answered
Aug 18, 2021
in
Chemistry Form 2
structure and bonding
0
votes
The set up below was used to collect gas Z produced by the reaction between water and calcium metal. set up on water and calcium metal reaction Give a chemical test for gas Z. 2mks Write the equation of the reaction between the calcium metal and water.
answered
Aug 18, 2021
in
Chemistry Form 1
water and hydrogen
0
votes
The rate of diffusion of neon was found to be 1.45 times faster than that of an equa! volume of gas X at room temperature. Determine the relative formula mass of gas X (Ne = 20.0).
answered
Aug 18, 2021
in
Chemistry Form 3
gas laws
0
votes
20cm3 of oxygen diffused through a porous partition in 70s .how long would it take 20cm3. Of sulphur VI oxide to diffuse through the same portion under the same condition.
answered
Aug 18, 2021
in
Chemistry Form 3
gas laws
0
votes
Name two other gases which could be used to reduce copper II oxide.
answered
Aug 18, 2021
in
Chemistry Form 2
carbon and its compounds
nitrogen and its compounds
0
votes
Hydrogen was passed over copper II oxide in a combustion tube.
answered
Aug 18, 2021
in
Chemistry Form 1
water and hydrogen
0
votes
A compound W consist of 26.7%carbon, 2.2% hydrogen and the rest oxygen. It has a relative formula Mass of 90(C=12, H=1, O=16,)
answered
Aug 18, 2021
in
Chemistry Form 3
the mole-formulae and chemical equations
0
votes
Draw a dot (.) and cross (X) diagram to show the bonding in the molecules of : (Atomic number of carbon is 6, Oxygen is 8 and hydrogen is 1)
answered
Aug 18, 2021
in
Chemistry Form 2
structure and bonding
0
votes
The diagram below represents a luminous flame. disgram of luminous flame Mark and label on the diagram the hottest and coolest parts
answered
Aug 18, 2021
in
Chemistry Form 1
air and combustion
luminous flame
0
votes
Explain the following observations
answered
Aug 18, 2021
in
Chemistry Form 2
chemical families patterns in properties
0
votes
A fixed mass of a gas has a volume of 200cm3 at a temperature of 47°C and 750mmHg. Calculate the volume the gas would occupy at 7°C and 750mmHg pressure.
answered
Aug 18, 2021
in
Chemistry Form 3
gas laws
0
votes
Element J belong to period 3 and group V.
answered
Aug 18, 2021
in
Chemistry Form 1
chemical families patterns in properties
0
votes
A student prepared ammonia gas and wanted to make a solution in water. Complete the diagram to show how he made the solution.
answered
Aug 18, 2021
in
Chemistry Form 1
nitrogen and its compounds
0
votes
Classify the changes below as physical or chemical changes.
answered
Aug 18, 2021
in
Chemistry Form 1
simple classification of substances
0
votes
The table below shows the atomic numbers of elements F G and H.
answered
Aug 18, 2021
in
Chemistry Form 2
chemical families patterns in properties
0
votes
Name the two allotropes of sulphur.
answered
Aug 18, 2021
in
Chemistry Form 3
sulphur and its compounds
describe the allotropes of sulphur
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