to investigate the variation of current(i) with pd(v) for copper electrodes in a copper-sulfate solution

Question 1

how was the potential difference changed during the investigation?

Answer 1

a rheostat or variable resistor, by adjusting the rheostat, the resistance of the circuit is adjusted. the voltage is being divided between the thin metallic conductor’s resistance and the rheostat’s resistance, and when adjusted or varied, results to lowering/increasing the voltage

Question 2

how would you use your graph to calculate the resistance of the electrolyte

Answer 2

slope=resistance

Question 3

what was observed at the electrodes as current flowed through the electrolyte?

Answer 3

bubbles of gas form at the electrodes due to the chemical effect of an electric current.

Question 4

draw a sketch of the graph that would be obtained if inactive electrodes were used in this experiment.

Answer 4

the graph will cut the x axis instead of cutting the origin, as the voltameter produces an emf across its plates which applied voltage must be greater than before current will flow

Question 5

what errors are there in this experiment?

Answer 5

use a sensitive voltmeter and ammeter
use connecting wires with a low resistance
make sure the plates are clean and clear of oxidation