What is a key benefit of hydrogen fuel cells?

• High emissions

• Inefficiency

• Zero emissions

• Slow refueling

In a redox reaction, what happens to the element that is oxidized?

• Gains electrons

• Loses electrons

• Remains unchanged

• Gains protons

What is a characteristic of hydrogen fuel cells?

• Noisy

• Inefficient

• Quiet

• Slow

What is the main challenge in using green hydrogen?

• High emissions

• High cost

• Low efficiency

• Limited applications

What is the oxidation state of Zn in the reactants?

• 0

• +1

• +2

• -1

Which element is reduced in the reaction?

• Hydrogen

• Zinc

• Oxygen

• Carbon

Which element is oxidized in the reaction?

• Zinc

• Hydrogen

• Oxygen

• Carbon

What happens to the oxidation state of hydrogen when it is reduced?

• It goes from +1 to 0

• It goes from 0 to +1

• It goes from +2 to 0

• It goes from 0 to +2

What happens to the oxidation state of zinc when it is oxidized?

• It goes from 0 to +2

• It goes from +2 to 0

• It goes from +1 to 0

• It goes from 0 to +1

What is the hint provided in the document for balancing the equation?

• Add OH⁻ to the products side

• Use a plastic water bottle

• Check hydrogen levels with a straw

• Use a 9V battery