1. a) In an experiment to determine the percentage of oxygen in the air, the apparatus below were set up. Study the set up and information provided to answer the questions that follow 2. Copper fillings T 12 Water T2 Toc Heat 24 - flock H (sooom) A 500cm' measuring cylinder k was filled with water and assembled for gas collection. Copper turnings were heated red hot and water was passed slowly into 500cm flask H until it reached the 500 cm mark A colourless gas was collected in K. a) What was the purpose of passing water into flask H? (1 mark) b) What observation were made in the combustion tube? (1 mark) c) Name three gases that the likely to be found in tube J. (1 mark) d) What was the volume of the gas collected in the measuring cylinder at the end of the experiment? (1 mark) e) Calculate the percentage of oxygen in air using the above results. (2 marks) f) State two possible sources of error in the experiment above. (2 marks) g) State two methods of accelerating rusting