Question

Which of the following is true concerning changes of state? All changes of state take place at the same temperature. State changes happen at different points for different substances The freezing point is the same for all substances. The boiling point is the same for all substances.

Answer 1

State changes happen at different points for different substances. This is due to the fact that not all substances are the same, and so there bond strengths are different resulting in different boiling/ melting points/ physical properties.
Even water with some impurities would boil after 100 degrees Celsius!

Hope this helps