Changes of State

Science — Second Preparatory

Common mistakes

Comparison aspect	Main idea	Keywords
Mistake	thinking that the temperature rises during melting or boiling. Correct: the temperature stays constant and the heat is used to change the state	thinkingtemperaturerisesduring
Mistake	thinking that heat is released during melting. Correct: melting absorbs heat while freezing releases it	thinkingheatreleasedduring
Mistake	confusing evaporation with boiling. Correct: evaporation happens at the surface at any temperature while boiling happens throughout the liquid at a fixed temperature	confusingevaporationboilingCorrect
Mistake	thinking that a change of state changes the substance chemically. Correct: a change of state is a physical change and the chemical composition stays the same	thinkingchangestatechanges

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