Simple Cells

Question 1

Elements of a simple cell

Answer 1

1. Converts chemical energy to electrical energy.
2. Has a voltmeter, which measures the voltage in a battery
3. Electrodes are made of different types of metals dipped into the electrolyte, and they are of different reactivities
4. Electrolyte

Question 2

Anode

Answer 2

Negative Polarity
More reactive metal allows it to be oxidised better, meaning that it causes the formation and release of cations into electrolyte and the release of electrons in the outer circuit

Question 3

Cathode

Answer 3

Positive Polarity
Less reactive metal allows cations from the electrolyte to gain electrons and be reduced

Question 4

Differences between simple cell and electrolytic cell

Answer 4

Sources
Simple Cell -> Chemical changes produces electrical energy
Electrolytic Cell -> External Source

Movement of electric current
Simple Cell -> Anode to Cathode
Electrolytic Cell -> Battery to cathode, electrolyte and then anode

Polarity
Simple Cell -> Anode is negative, cathode is positive
Electrolytic Cell -> Anode is positive terminal and cathode is the negative terminal

Question 5

How do fuel cells work

Answer 5

Derives energy from the continuous adding of fuel to the anode and the continuous adding of a oxidising agent to the cathode. In hydrogen context, hydrogen is the fuel and oxygen is the oxidising agent.

Question 5

Advantages and Disadvantages of Hydrogen Fuel Cells

Answer 5

Advantages
1. Renewable source of energy
2. Does not contribute to global warming since water is a by-product
3. More energy efficient than other fuel-burning electricity sources
Disadvantages
1. Hard to transport and carry around as it is highly flammable
2. Energy required for production of hydrogen during electrolysis is a lot