Understanding Galvanic Cells and Reactions

The video tutorial explains the chemical reaction between copper ions and zinc in an aqueous solution, focusing on the concepts of oxidation and reduction. It details the half reactions and the role of voltage in driving the reaction. The tutorial then demonstrates how to construct a galvanic cell, highlighting the importance of the cathode and anode. Finally, it discusses the role of a salt bridge in maintaining charge balance and enabling continuous current flow.

What happens to copper ions in an aqueous solution when a zinc bar is introduced?

• They become gaseous.

• They form a solid state.

• They evaporate.

• They remain in the solution.

In the reaction, what happens to zinc when it loses electrons?

• It becomes a gas.

• It remains neutral.

• It forms a solid.

• It becomes a positive ion.

What is the significance of the oxidation number in this reaction?

• It shows the hypothetical charge.

• It indicates the color of the ion.

• It represents the real charge of the ion.

• It determines the state of matter.

How is the energy of the entire reaction calculated?

• By dividing the energies of the half reactions.

• By multiplying the energies of the half reactions.

• By subtracting the energies of the half reactions.

• By adding the energies of the half reactions.

What is the role of the wire in a galvanic cell?

• To prevent electron flow.

• To allow electron flow between metals.

• To change the color of the solution.

• To increase the temperature of the solution.

In a galvanic cell, where does oxidation occur?

• At the anode.

• In the salt bridge.

• In the solution.

• At the cathode.

What is the main purpose of a galvanic cell?

• To increase the temperature.

• To change the state of matter.

• To generate electricity.

• To create a chemical reaction.

What is the function of the salt bridge in a galvanic cell?

• To decrease the temperature.

• To change the color of the solution.

• To maintain charge balance.

• To increase the voltage.

What happens if the solution becomes too positive or negative without a salt bridge?

• The solution changes color.

• The reaction stops.

• The solution evaporates.

• The reaction speeds up.

Which ions move through the salt bridge to maintain neutrality?

• Only positive ions.

• Only negative ions.

• No ions move.

• Both positive and negative ions.