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0
votes
Draw and name two isomers of Pentane()
answered
Jul 27, 2021
in
Chemistry Form 3
organic chemistry
0
votes
Air was passed through several reagents as shown below
answered
Jul 27, 2021
in
Chemistry Form 1
air and combustion
0
votes
The diagram below shows the relationship between the physical states of matter.
answered
Jul 27, 2021
in
Chemistry Form 1
classification of substances
states of matter
0
votes
The curves below represent the variation of temperature with time when pure and impure samples of a solid were heated separately.
answered
Jul 27, 2021
in
Chemistry Form 1
classification of substances
0
votes
In an experiment 3.36g of iron fillings were added to excess copper (II) sulphate. Calculate the mass of copper that was deposited. (CU= 63.5, Fe = 56)
answered
Jul 27, 2021
in
Chemistry Form 3
the mole: formulae and chemical equations
0
votes
The structure of two molecules of water can be represented as shown below.
answered
Jul 27, 2021
in
Chemistry Form 1
water and hydrogen
0
votes
Give two applications of chromatography?
answered
Jul 27, 2021
in
Chemistry Form 1
classification of substances
chromatography
0
votes
What is paper chromatography?
answered
Jul 27, 2021
in
Chemistry Form 1
classification of substances
chromatography
0
votes
A piece of burning magnesium ribbon was plunged into a gas jar containing sulphur (IV) oxide.
answered
Jul 27, 2021
in
Chemistry Form 3
sulphur and its compounds
0
votes
GSTRU and P belong to the same period in the periodic table. The ions formed by the atoms are as below:-
answered
Jul 27, 2021
in
Chemistry Form 2
structure of the atom and the periodic table
0
votes
Name the process which take place when white sugar changes to black solid when mixed with excess concentrated sulphuric acid.
answered
Jul 27, 2021
in
Chemistry Form 3
sulphur and its compounds
0
votes
Name the process which take place when Fe2+ changes to Fe3+
answered
Jul 27, 2021
in
Chemistry Form 1
air and combustion
0
votes
Name the process which take place when Iodine changes directly from solid to gas
answered
Jul 27, 2021
in
Chemistry Form 1
classification of substances
0
votes
Chlorine gas was bubbled through a solution of potassium iodide in boiling tube.
answered
Jul 27, 2021
in
Chemistry Form 3
chlorine and its compounds
0
votes
An element X is represented as 1840X (X = is not the actual symbol of the element)
answered
Jul 27, 2021
in
Chemistry Form 2
atoms
structure of the atom and the periodic table
0
votes
State one way in which the strength of a base or an acid can be determined in the laboratory.
answered
Jul 27, 2021
in
Chemistry Form 1
acids bases and indicators
0
votes
The diagram below illustrates an experiment set up to investigate the effect of heat on copper (II) carbonate. Study it and answer the questions that follow.
answered
Jul 27, 2021
in
Chemistry Form 1
air and combustion
0
votes
State the importance of oxygen in cutting metals
answered
Jul 27, 2021
in
Chemistry Form 1
air and combustion
0
votes
Complete the table below to show pairs of substances used to prepare oxygen.
answered
Jul 27, 2021
in
Chemistry Form 1
air and combustion
0
votes
An experiment was set up as shown below.
answered
Jul 27, 2021
in
Chemistry Form 3
nitrogen and its compounds
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