U3AOS2 - Rechargable Batteries

Question 1

Primary Cells

Answer 1

non-rechargeable galvanic cells that produce electricity using redox reactions

Question 2

Secondary Cells (inc basic chemical process)

Answer 2

rechargeable galvanic cells that can be reused

split into two processes:
discharge (operates as a galvanic cell - spontaneous reaction)
recharge (operates as an electrolytic cell - requires a voltage higher than the potential difference of the cell)

Question 3

Condition where you can call something a battery in an exam

Answer 3

When it contains multiple cells

if it only contains a single cell - refer to it as a cell, not a battery

Question 4

How does battery temperature influence side reactions

Answer 4

An increase in temperature will increase the rate of side reactions, compromising the batteries functionality, and thus decreasing the life of the battery

Question 5

How does battery temperature influence rate of reaction

Answer 5

An increase in temperature will increase the rate of reaction of the battery, thus increasing the overall capacity of the battery

Question 6

Optimal conditions for a battery

Answer 6

a temperature at which: the rate of side reactions does not occur too quickly,
and yet, a temperature at which: the battery capacity is not diminished