Physics · May / June 2021 · Paper 42 · Question 4
0625
As printed in the paper
Show the answer and mark scheme
4(a)(i)[1]
random / haphazard / zig-zag / irregular
4(a)(ii)[3]
(liquid / water) molecules move fast OR (pollen) particles massive
collide / bombard
uneven collisions / collisions from different directions (cause random movement) OR (liquid / water) molecules move randomly
4(b)(i)[3]
cooling
(thermal) energy used / needed to evaporate (ethanol) / overcome attractive forces(between molecules / particles) thermal energy taken from skin / patient / person
alternative route for last two m.p.s
more / most energetic (liquid) molecules / particles escape OR less / least energetic (liquid) remain
less / least energetic molecules / particles linked to lower temp (of skin)
4(b)(ii)[1]
greater / increases / faster / higher
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