Electrolysis of Aqueous Copper Sulfate Experiment

The video tutorial explains the electrolysis of aqueous copper sulfate using copper electrodes. It covers the theoretical background, formulates a hypothesis, and describes the experimental setup. The experiment involves varying the current to observe changes in the mass of the electrodes. Results are recorded and analyzed, showing that increased current leads to more copper deposition on the cathode.

What happens to copper atoms at the anode during electrolysis of copper sulfate?

• They gain electrons and form copper ions.

• They dissolve into the solution as neutral atoms.

• They lose electrons and form copper ions.

• They remain unchanged.

What is the hypothesis regarding the effect of current on copper deposition?

• Increasing current decreases copper deposition.

• Increasing current has no effect on copper deposition.

• Increasing current increases copper deposition.

• Current does not affect copper deposition.

What is the purpose of cleaning the electrodes with sandpaper before the experiment?

• To remove deposits that might affect conductivity.

• To make them more reactive.

• To increase their size.

• To change their chemical composition.

What is the initial mass of the cathode before electrolysis begins?

• 2.43 grams

• 2.4 grams

• 3.48 grams

• 3.44 grams

How long is the electrolysis process carried out in each experiment?

• 5 minutes

• 10 minutes

• 15 minutes

• 20 minutes

What is the change in mass of the anode when the current is set to 0.4 amps?

• +0.04 grams

• -0.04 grams

• +0.05 grams

• -0.05 grams

What is the role of the hot air dryer in the experiment?

• To dry the electrodes without removing deposited copper.

• To heat the solution.

• To cool the electrodes.

• To remove copper from the electrodes.

What is the final mass of the cathode after electrolysis with a current of 0.6 amps?

• 2.43 grams

• 2.41 grams

• 2.48 grams

• 2.44 grams

What is the relationship between current and mass change at the cathode?

• Current has no effect on mass change.

• Mass change is independent of current.

• Higher current results in more mass change.

• Higher current results in less mass change.

What is the dependent variable in this electrolysis experiment?

• The current through the circuit.

• The mass change of the cathode.

• The initial mass of the anode.

• The voltage applied.