Group 2 And Group 7 Flashcards
How does reactivity with water change down Group 2?
Reactivity with water increases down the group, with magnesium barely reacting and barium reacting vigorously.
What is the reaction of magnesium with water?
Mg(s) + 2H₂O(l) → Mg(OH)₂(aq) + H₂(g)
What is the reaction of magnesium with steam?
Mg(s) + H₂O(g) → Mg(OH)₂(s) + H₂(g)
How does the melting point trend in Group 2 elements?
Melting point decreases down the group, except for magnesium, which has the lowest melting point.
How does solubility of Group 2 sulfates change down the group?
Solubility decreases down the group, with barium sulfate being almost insoluble.
What happens when Group 2 elements react with water?
They react vigorously with water to produce hydroxides.
How does solubility of Group 2 hydroxides change down the group?
Solubility increases down the group, with magnesium hydroxide being barely soluble.
What is the typical method for extracting metals?
The usual way of extracting metals is by using carbon.
What is the problem with using carbon to extract titanium?
It produces titanium carbonate, which is too brittle to use in industry.
What are the two steps for extracting titanium?
- TiO₂ + 2Cl₂ → TiCl₄ + O₂
- TiCl₄ + Mg → Ti + MgCl₂
What is the chemical formula for limestone?
CaCO₃(s)
What is the chemical formula for quicklime?
CaO(s)
What is the chemical formula for slaked lime?
Ca(OH)₂(s)
What is the chemical formula for lime water?
Ca(OH)₂(aq)
