DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.c

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Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.sl.TZ0.c
Level sl Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
17N.3.sl.TZ0.c

Much of our energy needs are still provided by the refined products of crude oil.

Climate change or global warming is a consequence of increased levels of carbon dioxide in the atmosphere. Explain how the greenhouse effect warms the surface of the earth.

[3]

Markscheme

Any three of:

incoming solar radiation is short wavelength/high frequency/high energy/UV

radiated/emitted as long wavelength/low frequency/low energy/IR «radiation»

energy/IR «radiation» absorbed by «bonds in» greenhouse gases

energy radiated/emitted as IR «radiation» some of which returns back to Earth

Do not accept “reflected” OR “bounced” OR “trapped”.

[Max 3 Marks]

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