Predicting the properties of francium

2 marks · Easy

Room temperature is about 25°C. If francium has a melting point of 22°C, what state (solid or liquid) would you expect francium to be in at room temperature? Explain your answer with a calculation.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

Liquid

Must show: Shows 25°C > 22°C, Explains francium melts at 22°C

Also accept: Liquid at room temperature as room temperature is above its melting point

Common mistakes: Solid; Answering with state but no calculation

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Shows calculation/comparison: 25°C (room temperature) > 22°C (melting point).

A1 · 1 mark · States francium would be liquid at room temperature. (follow-through)

Worked solution

Francium melts at 22°C. Room temperature is 25°C, which is above the melting point.

Therefore, francium would be liquid at room temperature.