Reactions of the halogens
2 marks · HardA science teacher has three sealed containers, each holding one of the following halogens at room temperature (25°C):
One container holds a halogen which is a red-brown liquid at room temperature. Name this halogen and state its physical state at room temperature.
Another container holds a halogen that is a grey-black solid at room temperature. Name this halogen and state its colour at room temperature.
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
(a) Bromine, liquid · must show Bromine, liquid
(b) Iodine, grey-black · must show Iodine, grey-black
Common mistakes: Mixing up the states or colours of bromine and iodine
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly names bromine and states its state as liquid at room temperature.
B1 (b) · 1 mark · Correctly names iodine and states its colour as grey-black at room temperature.
Worked solution
a) The only halogen that is a red-brown liquid at room temperature is bromine. Its physical state at room temperature is liquid.
b) The grey-black solid halogen at room temperature is iodine. Its colour is grey-black.