Question

AIR AND COMBUSTION

Copper turnings
Syringe A
200 cm³ of air
Pressure tubing
Heat
Syringe B
0 cm³
After sometime, the volume of air in syringe A was 160 cm³ and syringe B 0 cm³.
(a) Calculate the percentage of oxygen in the initial sample of air.
(b) Write down a word equation for the reaction that took place in the combustion
tube.
(c) What are the possible sources of error in the experiment?

Answer 1

Answer:(a) To calculate the percentage of oxygen in the initial sample of air, we need to determine the change in volume of oxygen in syringe A.

Explanation: The initial volume of air in syringe A was 200 cm³, and after some time, it reduced to 160 cm³. This means that 40 cm³ of air was consumed in the reaction.