The students plotted their results on a graph.
Figure 2 shows the graph.
0.6-
Total
mass of
copper
produced
in g
0.4-
0.2
0
10
Figure 2
20
Time in minutes
Current = 0.9 A
30
Current = 0.6 A
Current = 0.3 A
A student correctly concluded that the total mass of copper produced is directly
proportional both to the time and to the current.
(e) How do the results in Figure 2 support the conclusion that the total mass of copper
produced is directly proportional to the time?
How do the results in Figure 2 support the conclusion that the total mass of copper
produced is directly proportional to the current?
Use data from Figure 2 in your answer.
(g) Copper nitrate solution is blue.
Suggest why the blue colour of the copper nitrate solution fades during the
electrolysis.