DP Chemistry (last assessment 2024)

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Question 20N.3.hl.TZ0.b(i)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.hl.TZ0.b(i)
Level hl Paper 3 Time zone TZ0
Command term Outline Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 2]
20N.3.hl.TZ0.b(i)

There has been significant growth in the use of carbon nanotubes, CNT.

CNT can act as Type 2 superconductors. Outline why Type 2 superconductors are generally more useful than Type 1.

[2]

Markscheme

Any two of:
have higher critical temperatures/Tc «than Type 1»
OR
can act at higher temperatures ✔

have higher critical magnetic fields/Bc «than Type 1» ✔

less time needed to cool to operating temperature ✔

less energy required to cool down/maintain low temperature ✔

Examiners report

Most gained at least one mark here for stating that Type 2 superconductors have higher critical temperatures than Type 1.

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