Physics · May / June 2021 · Paper 41 · Question 4
0625
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The question as text
An aluminium saucepan with a plastic handle contains cold water. Fig. 4.1 shows the saucepan on a hotplate. aluminium saucepan water hotplate plastic handle Fig. 4.1
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4(a)[1]
aluminium is a (good) conductor (of heat) and plastic is a poor conductor / does not conduct (heat)
4(b)(i)[1]
increase in kinetic energy of molecules or increase in potential energy of molecules
4(b)(ii)[3]
any three from:
atoms (touching the hotplate) / lattice vibrate (faster)atoms pass on energy / vibration to neighbouring atoms / to other atoms by collisionatoms pass on energy to electronselectrons hit distant atoms or electrons move (through lattice)4(b)(iii)[3]
molecules escape from the liquid (as a vapour)
bonds broken / (attractive) forces overcome
molecules gain potential energy
or work done (to separate molecules / break bonds / overcome forces)
4(b)(iv)[3]
840 W
(E =) mlv in any form or 0.11 × 2.3 × 106 or 2.53 × 105
(rate =) mlv / t in any form or 0.11 × 2.3 × 106 / 300 or 2.53 × 105 / 300
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