Question
(a) Define internal energy. [1] (b) Explain how internal energy changes when water is heated from 20°C to 100°C and then boiled. [3]
4 marks · take your time before peeking.
Sign up to try the next 30 problems
Save your streak, mark answers against the spec, and build a daily revision habit. Free during public beta — no card, no auto-renew.
Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.