Chlorine and bromine are halogens.
Complete the table by giving the missing colour of chlorine and the physical state of bromine at room temperature.
| Halogen | Colour | Physical state |
|---|---|---|
| chlorine | gas | |
| bromine | red-brown |
Chlorine reacts with phosphorus to form the covalent compound phosphorus trichloride.
Draw a dot-and-cross diagram to show the outer electrons in a molecule of phosphorus trichloride.
You can use the following layout of atoms as a guide:
ClPClCl \begin{array}{ccc} \text{Cl} & \text{P} & \text{Cl} \\ & \text{Cl} & \end{array} ClPClClPhosphorus trichloride reacts with water to form a mixture of two acids, HCl\text{HCl}HCl and H3PO3\text{H}_3\text{PO}_3H3PO3.
Write a chemical equation for this reaction.
33 exam-style questions on Edexcel IGCSE Chemistry Group 7 (halogens) – chlorine, bromine and iodine. Each one has a worked solution and a mark scheme showing where the marks go.