Carbon dioxide, CO2\mathrm{CO_{2}}CO2, is dissolved in water under pressure to make fizzy drinks. In a carbon dioxide molecule, the carbon atom is joined to each oxygen atom by a double covalent bond.
The electronic configuration of carbon is 2.4. The electronic configuration of oxygen is 2.6.
Give the number of electrons shared in one double covalent bond.
Give the total number of shared pairs of electrons in a carbon dioxide molecule.
Explain why the carbon atom forms a double bond with each oxygen atom.
In a dot-and-cross diagram of carbon dioxide, the electrons from carbon are shown as dots and the electrons from oxygen are shown as crosses. Describe how the six outer electrons of one oxygen atom are shown in the diagram.
Calculate the relative formula mass (MrM_{r}Mr) of carbon dioxide. Relative atomic masses: C = 12, O = 16
53 exam-style questions on Edexcel GCSE Chemistry 2.4 Covalent bonding, covering 2.4.1 Covalent bonding and simple molecules. Each one has a worked solution and a mark scheme showing where the marks go.