Edexcel A-Level Physics Internal Energy

Practise Edexcel A-Level Physics internal energy by explaining molecular kinetic and potential energy changes during heating, melting and cooling.

Exam points

identify kinetic and potential energy changes when a solid melts at constant temperature
explain cooling-curve sections using internal energy as molecular kinetic plus potential energy

[Maximum number: 1]

Ice at $0^{\circ} \mathrm{C}$ melts into water at $0^{\circ} \mathrm{C}$ .
Which row of the table gives the changes in mean molecular kinetic energy and mean molecular potential energy as the ice melts?

Mean molecular
kinetic energy

Mean molecular
potential energy

no change

increases

no change

increases

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5.3.128 - Internal energy question 1