Physical properties

2 marks · Easy

The boiling point of ethene is -104°C, and that of propene is -47°C. Calculate the difference in boiling points between these two alkenes.

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

57 °C (±0)

Must show: process shown, correct subtraction

Common mistakes: negative answer; no working shown

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Shows correct process for finding difference: |-47 - (-104)|

A1 · 1 mark · Correct answer: 57°C

Worked solution

Difference = -47°C - (-104°C) = -47 + 104 = 57°C