Cells and Batteries

• What should you be able to describe by the end of the video on batteries?

  What is meant by a cell and a battery
• What is the purpose of the video on batteries?

  To explain the chemistry inside batteries and evaluate different metals used in them
• What is an electrolyte?

  A solution that can conduct electricity
• What happens when two different metals are placed in an electrolyte?

  They produce electricity through a chemical reaction
• What is the setup called when two metals are connected to produce electricity?

  A cell
• Why does a cell only produce electricity for a certain period of time?

  Because the chemicals in the cell eventually run out
• What is the reactivity series of metals?

  A ranking of metals based on their reactivity
• How does the potential difference of a cell depend on the metals used?

  It depends on the difference in reactivity between the two metals
• If a cell contains magnesium and copper, what can be expected regarding its potential difference?

  It will have a large potential difference
• What happens when zinc and tin are used in a cell?

  It will have a smaller potential difference due to less difference in reactivity
• What is a battery composed of?

  Two or more cells connected in series
• How does connecting cells in series affect voltage?

  It produces a greater voltage
• What is the potential difference of a single cell mentioned in the video?

  Approximately 2.5 volts
• What is the difference between rechargeable and non-rechargeable batteries?

  Rechargeable batteries can reverse chemical reactions when an electrical current is applied
• What happens to the reactants in non-rechargeable batteries?

  They run out and normal electricity is produced
• What are the key differences between rechargeable and non-rechargeable batteries?

  • Non-rechargeable batteries cannot reverse their chemical reactions.
  • Rechargeable batteries can be recharged by applying an electrical current.
• What factors affect the potential difference produced by a cell?

  • The difference in reactivity between the two metals used.
  • The type of electrolyte used.
• What is the process that occurs in a cell to generate electricity?

  1. Two different metals are placed in an electrolyte.
  2. A chemical reaction occurs on the surface of the metals.
  3. This reaction produces electricity.
• What is the reactivity series and its significance in battery chemistry?

  • A ranking of metals based on their reactivity.
  • Used to choose metals for electrical cells to maximize potential difference.