Prepare and collect dry samples of chlorine and ammonia gas. Also, identify a thermometer and calculate the temperature change from the provided readings.

Here are the solutions for the questions:

c) To prepare and collect dry samples of chlorine and ammonia gas:

• For chlorine gas ($\text{Cl}_2(\text{g})$): Chlorine is denser than air, so it is collected by downward delivery (upward displacement of air).
• For ammonia gas ($\text{NH}_3(\text{g})$): Ammonia is less dense than air, so it is collected by upward delivery (downward displacement of air).

d) (i) Name the apparatus:
The apparatus shown is a thermometer.

d) (ii) Complete the table below: