Iodine (I2\text{I}_2I2) is a crystalline solid at room temperature that readily sublimes upon gentle heating to form a purple vapor.
Which statement correctly explains why iodine sublimes at a relatively low temperature?
The covalent bonds between the iodine atoms are weak and are easily broken.
Only weak van der Waals forces between the non-polar I2\text{I}_2I2 molecules are overcome.
Strong permanent dipole-dipole forces between polar I2\text{I}_2I2 molecules are broken.
The giant covalent structure is held together by weak localized electrostatic forces.
74 exam-style questions on OCR GCSE Chemistry Bonding. Each one has a worked solution and a mark scheme showing where the marks go.