Reactions of the halogens
2 marks · EasyA sample contains equal volumes of chlorine and bromine at room temperature. Chlorine is a green gas and bromine is a red-brown liquid under these conditions. Calculate the total number of different physical states present in the sample, and state the color for each state.
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There are 2 different physical states (gas and liquid): chlorine is a green gas, bromine is a red-brown liquid.
Also accept: Gas (green, chlorine), liquid (red-brown, bromine); 2 physical states: gas (green, chlorine), liquid (red-brown, bromine)
Common mistakes: Saying only one state present; Mixing up which element is a liquid
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Marking points
M1 · 1 mark · Identifies there are 2 different physical states (gas and liquid) present.
A1 · 1 mark · States the correct color associated with each physical state (chlorine: green gas, bromine: red-brown liquid).
Worked solution
At room temperature, chlorine is a green gas and bromine is a red-brown liquid.
This means there are two physical states present: gas (chlorine) and liquid (bromine).
Therefore, the total number of different physical states is 2: