What is the temperature, in K, that is equivalent to 57°C?
A. 220
B. 273
C. 330
D. 430
Answer/Explanation
Markscheme
C
The internal energy of any substance is made up of the
A. total random kinetic and potential energy of its molecules.
B. total potential energy of its molecules.
C. total random kinetic energy of its molecules.
D. total vibrational energy of its molecules.
Answer/Explanation
Markscheme
A
Examiners report
A minority of candidates at both levels opted for response C believing that internal energy is only the kinetic energy of any substance; this is only true for ideal gases.
Molar mass is defined as
A. the number of particles in one mole of a substance.
B. \(\frac{1}{{12}}\) the mass of one atom of carbon-12.
C. the mass of one mole of a substance.
D. the number of particles in \(\frac{1}{{12}}\) of a mole of carbon-12
Answer/Explanation
Markscheme
C
A solid of mass m is initially at temperature ΔT below its melting point. The solid has specific heat capacity c and specific latent heat of fusion L. How much thermal energy must be transferred to the solid in order to melt it completely?
A. mL+mc
B. mc+mLΔT
C. mcΔT+LΔT
D. mcΔT+mL
Answer/Explanation
Markscheme
D
The specific latent heat of a substance is defined as the energy required at constant temperature to
A. change the phase.
B. change the phase of 1 kg.
C. change the phase of 1 m3.
D. change the phase of 1 kg every second.
Answer/Explanation
Markscheme
B
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