O-LevelChemistryMetals & Reactivity5070/22 · Oct/Nov 2016 · Q66 Marks
Sodium and rubidium are alkali metals.
- (a)Explain how metals conduct electricity.[1]
- (b)State two trends in the properties of the alkali metals.[2]
- (c)Name the products formed when rubidium reacts with water. and[2]
- (d)Titanium is extracted from titanium(IV) chloride by reduction with molten sodium. TiCl4 + 4Na → 4NaCl + Ti Suggest why sodium reduces titanium(IV) chloride.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [1] electrons move (throughout the structure)/mobile electrons
- [1] decrease in melting point down the group, Or Reverse Argument (ORA) /decrease in boiling point down the group ORA
- [1] increase in density down the group ORA
- [1] increase in reactivity down the group ORA
- [1] decrease in hardness down the group ORA
- [1] rubidium hydroxide
- [1] hydrogen
- [1] sodium more reactive (than titanium) ORA/sodium higher in reactivity series (than titanium) ORA
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