Activity 2H (Textbook) – Chemistry Form 5 Chapter 2 (Carbon Compound)

Activity 2H:
Conduct this activity in groups.
1. Write the balance equation for the combustion of the following alkane:
(a) Ethane, C₂H₆
(b) Propane, C₃H₈
(c) Hexane, C₆H₁₄
(d) Octane, C₈H₁₈

2. Based on your knowledge on the reaction between alkane and halogen, discuss how ethane, C₂H₆ and bromine, Br₂ react with the presence of sunlight:
(a) Write the equation for each stage of the substitution reaction that occurs.
(b) Name each of the compounds formed.
Share your answers in a Gallery Walk activity.


Answer:
1. (a)
$$ 2 \mathrm{C}_2 \mathrm{H}_6+7 \mathrm{O}_2 \rightarrow 4 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O} $$

1. (b)
$$ \mathrm{C}_3 \mathrm{H}_8+5 \mathrm{O}_2 \rightarrow 3 \mathrm{CO}_2+4 \mathrm{H}_2 \mathrm{O} $$

1. (c)
$$ 2 \mathrm{C}_6 \mathrm{H}_{14}+19 \mathrm{O}_2 \rightarrow 12 \mathrm{CO}_2+14 \mathrm{H}_2 \mathrm{O} $$

1. (d)
$$ 2 \mathrm{C}_8 \mathrm{H}_{18}+25 \mathrm{O}_2 \rightarrow 16 \mathrm{CO}_2+18 \mathrm{H}_2 \mathrm{O} $$


2. (a)
$$ \mathrm{C}_2 \mathrm{H}_6 \quad+\quad \mathrm{Br}_2 \quad \rightarrow \quad \mathrm{C}_2 \mathrm{H}_5 \mathrm{Br} \quad+\quad \mathrm{HBr} $$

2. (b)