In an experiment to determine the formula of an oxide of copper, the copper oxide was reduced by hydrogen gas. The hydrogen was passed over the oxide of copper in a boiling tube with a hole near its end. The excess hydrogen was burnt off at this hole. The copper oxide was placed inside the boiling tube, which was clamped in a horizontal position, in a porcelain boat and was heated strongly.

a. Name the products of the reaction.

b. Draw a labelled diagram of the apparatus.

c. Make a list of the measurements you would make to find the formula of the oxide of copper.

d. Using the measurements made, how would you work out the mass contained in the oxide of copper of:

i. Copper

ii. Oxygen

e. The experiment was carried out by ten groups of students, each with a different initial mass of the oxide of copper. Sketch a graph with the line you would expect to enable you to work out the formula.