DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ1.14a.ii
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.hl.TZ1.14a.ii |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Apply, State | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 2]
18M.3.hl.TZ1.14a.ii
Modern electric cars store their energy in lithium ion batteries.
The diagram represents a cell in such a battery delivering a current.
(a.ii)
State the factor that limits the maximum current that can be drawn from this cell and how electrodes are designed to maximize the current.
[2]
Markscheme
Limiting factor:
internal resistance «of the cell»
Electrodes design:
large surface area
Accept “time it takes ions to diffuse between electrodes”.
Accept specific ways of increasing surface area, such as “porous electrodes”.
Accept “close together/small separation”.
[2 marks]