GCSE Grade Prediction Tool - Chemistry
Examination Practice Question
Chemistry (AQA 8462) – Paper 1
This question is about metals in the periodic table. Answer every part, then press the button to see your marks and an indicative grade.
Mendeleev left gaps in his periodic table for elements that had not been discovered.
He predicted the properties of an element he called eka-silicon.
Germanium was discovered in 1886.
The table shows Mendeleev’s predictions for eka-silicon and the properties of germanium.
| Property | Eka-silicon (predicted in 1871) |
Germanium (measured after 1886) |
|---|---|---|
| Relative atomic mass | 72 | 72.6 |
| Density in g/cm3 | 5.5 | 5.32 |
| Formula of oxide | EsO2 | GeO2 |
| Formula of chloride | EsCl4 | GeCl4 |
Lithium and sodium are both Group 1 elements.
Lithium reacts with water to produce lithium hydroxide solution and hydrogen gas.
Type it on one line, for example: 2 Na(s) + Cl2(g) -> 2 NaCl(s)
Iron is a transition metal.
Iron forms Fe2+ ions and Fe3+ ions.
02.4 Give the formula of iron(II) chloride and iron(III) oxide. [2 marks]