Physics · Oct / Nov 2021 · Paper 41 · Question 2
0625
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A student carries out an experiment using a plastic beaker that contains 0.24 kg of water at 17 °C. The thermal capacity (heat capacity) of the beaker is negligible.
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2(a)[2]
(quantity of thermal) energy or energy (to increase temperature) or energy (transferred by heating)
energy to increase temperature (of an object) per degree Celsius 1 °C
2(b)(i)[2]
(internal energy) depends on kinetic energy (of molecules)
kinetic energy (of molecules) decreases or potential energy (of molecules) decreases
2(b)(ii)[2]
(∆E =) mc∆T in any form or 0.24 × 4200 × 17
1.7 × 104 J
2(c)(i)[2]
k.e. of molecules / (thermal) energy absorbed (from water / surroundings) or energy absorbed from (cooling) water supplies latent heat or energy used to overcome intermolecular forces / to break bonds
2(c)(ii)[3]
any determination of mass
determine change in mass (of ice) / increase in mass of water or dry the ice or ensure water is at 0 °C / equilibrium is established or insulate the beaker
use (lf =) E / m in any form
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