B. The diagram below shows a key being plated with copper in an electrolytic cell.
B
CuSO (aq)
Copper Battery
electrode
Given the reduction reaction for this cell:
Cu2+ (aq) + 2e - Cu(s)
This reduction occurs at
A A, which is the anode
® A, which is the cathode
CB, which is the anode
DB, which is the cathode

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i