Hydrazine (N2H4\text{N}_2\text{H}_4N2H4) is a highly reactive compound widely used as a rocket propellant.
Draw a dot and cross diagram to show the covalent bonding in a molecule of hydrazine. Only the outer electrons in each atom need to be shown.
Compound Z is a sweet-smelling liquid often used as a solvent in nail varnish removers.
Compound Z contains 54.5% carbon, 9.1% hydrogen and 36.4% oxygen by mass. Calculate the empirical formula of Z.
The relative formula mass (MrM_rMr) of Z is 88. What is the molecular formula of Z?
80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.