Page 103 - Chemistry_Form_2

Chemistry
for Secondary Schools

Chapter summary

1. Chemical equations are short forms of chemical reactions. The reactants
are placed on the left hand side of the equation, while the products are
placed on the right hand side of the equation.
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2. Chemical equations are written by using the chemical symbols or formulas.

The state of each of the reactants and products is indicated in parentheses
and the equations are balanced.
3. An ionic equation is a chemical equation in which compounds in aqueous
solutions or in molten states are written in terms of dissociated ions.

4. Spectator ions are ions that do not change their valence states in a reaction.

5. The net ionic equation is the result of an ionic equation without the spectator
ions.
6. There are different types of chemical reactions. These include combination,
decomposition, displacement, precipitation, neutralisation and redox reactions.

Revision exercise 4

Choose the correct answer for Questions 1−5. For other questions, provide the
answers as per the demands indicated.

1. Which of the following statements describes chemical reactions?
(a) Occur only in living organisms.
(b) Occur in water only.
(c) Produce new substances.
(d) Only occur outside living organisms.

2. A certain metal hydroxide reacts with hydrochloric acid to produce salt and
water only. What type of reaction is this?
(a) Precipitation
(b) Displacement

(c) Neutralisation
(d) Combination

3. Which of the following is false regarding the decomposition of a simple
binary compound?
(a) The products are uncertain.

96 Student’s Book Form Two

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