Page 105 - Chemistry_Form_2

Chemistry
for Secondary Schools

10. Write the net ionic equation for the reaction between hydrochloric acid and
potassium hydroxide solutions.
11. (a) Differentiate between ionic equations and molecular equations and provide
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their significance in reaction analysis.
(b) Compare total ionic equations and net ionic equations, illustrating their
importance in predicting reaction outcomes and identifying spectator
ions in chemical processes.
12. Study the following chemical equation of a reaction and answer the questions
that follow.

(a) What type of the reaction is represented by the chemical equation?
(b) Write a net ionic equation for the chemical reaction.

13. Explain the uses of balanced chemical equations in improving efficiency,
safety, and cost-effectiveness in chemical manufacturing industries.

14. Describe the effect of heat on the decomposition of the following compounds
and represent these reactions using balanced chemical equations:
(a) Iron(II) sulfate
(b) Calcium hydrogencarbonate
(c) Ammonium nitrate
(d) Copper(II) carbonate

15. Why combustion reactions are considered exothermic? Use an example to
support your explanation.

16. A student placed a strip of zinc metal in copper(II) sulfate solution. After
a while, the blue colour of the solution faded, and a reddish-brown deposit
formed on the zinc strip.

(a) Explain the observations made and identify the type of reaction that
occurred.
(b) What would happen if a silver plate replaced zinc in the same solution?

17. A farmer wants to remove calcium ions from hard water using a precipitation
reaction.
(a) Suggest the chemicals that can be added to precipitate calcium ions.

(b) Write the balanced chemical equations for the reactions involved.

98 Student’s Book Form Two

01/08/2025 11:21:00
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 98
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 98 01/08/2025 11:21:00