Electrolysis of Aqueous Copper Sulfates: Analysis and Conclusion

The video tutorial covers the electrolysis of aqueous copper sulfate using copper electrodes. It begins with an introduction to the hypothesis that increasing current increases the mass of copper deposited on the cathode. The experiment setup is detailed, followed by the procedure and results. A graph is plotted to analyze the relationship between current and mass change, showing a proportional relationship. The conclusion confirms the hypothesis and notes that the mass change at the anode is equal and opposite to the cathode. The video ends with a summary of findings and encouragement for assessments.

What was Matt's hypothesis regarding the relationship between current and mass of copper deposited on the cathode?

• As current increases, mass increases.

• As current decreases, mass increases.

• As current increases, mass remains constant.

• As current increases, mass decreases.

What was the purpose of cleaning the electrodes with sandpaper and distilled water?

• To increase the conductivity of the electrodes.

• To remove impurities and ensure accurate mass measurement.

• To make the electrodes more reactive.

• To change the chemical composition of the electrodes.

Why did Matt use a current of 0.79 amps instead of 0.8 amps?

• The ammeter reading was unstable at 0.8 amps.

• The power supply could not provide 0.8 amps.

• The electrodes were not capable of handling 0.8 amps.

• The experiment required a lower current for accuracy.

What does the straight line through the origin on the graph indicate about the relationship between current and mass change?

• There is no relationship.

• The relationship is directly proportional.

• The relationship is inversely proportional.

• The relationship is non-linear.

What is the significance of the line of best fit in the context of this experiment?

• It shows the average mass change.

• It suggests a non-linear relationship.

• It confirms the hypothesis of proportionality.

• It indicates errors in the experiment.

What conclusion can be drawn about the mass change at the anode compared to the cathode?

• The mass change at the anode is less than at the cathode.

• The mass change at the anode is greater than at the cathode.

• There is no mass change at the anode.

• The mass change at the anode is equal and opposite to the cathode.

What is the final conclusion regarding the mass of copper deposited and lost during the experiment?

• The mass of copper deposited is less than the mass lost.

• There is no relationship between the mass deposited and lost.

• The mass of copper deposited is more than the mass lost.

• The mass of copper deposited is equal to the mass lost.