Question

The following set up was set for the form two class to study a certain concept.

1. Point out one mistake in the set-up and correct the mistake on diagram. 
2. State the aim of the experiment. 
3. Explain how the apparatus is used to achieve the aim of the experiment. 

Answer 1

1. Tube 3 is hanging instead of being dipped into the lime water in test tube B;
2. To compare the amount of carbon (II) oxide in inhaled and exhaled air.
3.  Close clip Q and open clip P; suck in air into the lungs through the mouth piece inserted into mouth; Hold the air in the lungs; close clip P and open clip Q; breath out through the mouth piece into tube 3 and into the lime water in test tube B; (5mks)