State two relevant observation for each of the following;
Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.
a) When NH4OH is added to copper (II) nitrate solution in small quantities then a pale blue ppt. is observed.
b)When added in excess it dissolves to give an inky blue solution forming a complex salt.
|
|
X |
Y |
|
Normal electronic configuration |
2,8,7 |
2,8,2 |
|
Nature of oxide |
Dissolves in water and turns blue litmus red |
Very low solubility in water. Dissolves in hydrochloric acid |
|
Tendency for oxidising and reducing reaction |
Tends to oxidise element and compounds |
Tends to act as a reducing agent |
|
Electrical and thermal conductivity |
Very poor electrical conductor poor thermal conductivity |
Good electrical conductor Good thermal conductor |
|
Tendency to form alloys and amalgums |
No tendency to form alloys |
Forms alloys |
Using the information above, complete the following:
(i) ......... is the metallic element.
(ii) Metal atoms tend to have maximum of ........ electrons in the outermost energy level
(iii) Non-metallic elements tends to form ………. Oxides while metal tends to form ……..oxides.
(iv) Non-metallic elements tend to be ……… conductors of heat and electricity.
(v) Metals tend to ……….. electrons and act as agents in their reactions with element and compounds.
State two relevant observation for each of the following;
Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
Give a chemical test to distinguish between the following pair of compounds:
sodium chloride solution and sodium nitrate solutionState one appropriate to observation for each of the following:
Excess of chlorine gas is reacted with ammonia gas.
State two relevant observation for each of the following;
Lead nitrate crystal are heated in a hard glass test tube.
Give a chemical test to distinguish between the following pair of compounds:
Hydrogen chloride gas and hydrogen sulphide gas.
State one appropriate observation for each of the following:
Electricity is passed through molten lead bromide.
A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution.
Identify the following substance which is underlined:
A gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water.
