Hydrazine is a highly reactive foaming agent used in the preparation of polymer foams and as a rocket propellant.
Draw a dot and cross diagram to show the covalent bonding in a molecule of hydrazine (N2H4\text{N}_2\text{H}_4N2H4). Only the outer electrons in each atom need to be shown.
Compound Z is a naturally occurring dicarboxylic acid found in broccoli and sugar beets.
Compound Z contains 40.7% carbon, 5.1% hydrogen and 54.2% oxygen by mass. Calculate the empirical formula of Z.
The relative formula mass (MrM_rMr) of Z is 118. 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.