MediumChemistryHigh School (9–10)GeneralStates of Matter › Change of StateConceptualNumericalBoard Exam

The melting and boiling points of four substances, at normal pressure, are: nitrogen 63 K and 77 K…

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

The melting and boiling points of four substances, at normal pressure, are: nitrogen $63\ \text{K}$ and $77\ \text{K}$ ; water $273\ \text{K}$ and $373\ \text{K}$ ; sulphur $388\ \text{K}$ and $718\ \text{K}$ ; gallium $303\ \text{K}$ and $2673\ \text{K}$ .

What is the state of each in your closed hand, at $310\ \text{K}$ ( $37\ ^\circ\text{C}$ )?

Need a reminder? The key ideaShow

$\text{K} = {}^\circ\text{C} + 273$ and ${}^\circ\text{C} = \text{K} - 273$ . A step of $1\ \text{K}$ is the same size as a step of $1\ ^\circ\text{C}$ . A substance is a solid below its melting point, a liquid between its melting and boiling points, and a gas above its boiling point.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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