1. The apparatus shown in Fig. 4.1 was set up under bright light for a period of five hours. At the start the apparatus was completely full of water. During this time, a gas was collected at the top of the graduated tube. rubber bung bright light gas 20 graduated tube 30 ood 40 50 00030 glass funnel, upside down pondweed Fig. 4.1 (a) (i) How would you show this gas was oxygen? ..***..* [1] (ii) Name the process within the plant responsible for the production of oxygen. ..[1] (iii) Determine the volume of gas collected in five hours and the rate of gas production per hour. volume.. . rate *** [2] (iv) How would you use this apparatus to obtain reliable results to show the effect of differing light intensities on the production of oxygen? *6*