An unlabelled sample of metal M is one of the Group 1 metals shown in the table.
| metal | symbol | relative atomic mass |
|---|---|---|
| lithium | Li | 7 |
| sodium | Na | 23 |
| potassium | K | 39 |
| rubidium | Rb | 85.5 |
A technician reacts 1.17 g of metal M completely with bromine in a closed apparatus. The mass of metal bromide formed is 3.57 g.
Relative atomic masses: Br = 80, C = 12, O = 16
Determine the identity of metal M. Show your working.
Carbonate ions have the formula CO32−\mathrm{CO_{3}^{2-}}CO32−.
A student claims that metal M makes up a smaller percentage of the mass of its carbonate than of its bromide.
Determine whether the student's claim is correct. Show your working.
119 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.