Group 2 Flashcards
What happens to atomic radius down the group and why?
Increases.More shielding.More electrons.More energy levels.More repulsion.
What happens to ionisation energy down the group and why?
Decreases. Electron held less tightly. Less energy needed to remove it. Atomic radius increases. More shielding.Attractive nuclear force decreases.
What happens to melting point down the group and why?
Decreases (in general). Giant metallic structures. All are 2+ Size increases down the group. Attraction between the ion and delocalised electrons decreases.Strength of bond decreases .Melting point decreases.
What happens to reactivity with water down the group?
Reactivity increases down the group.
Which group 2 element doesn’t react with water?
Beryllium doesn’t react.
How does magnesium react with water?
Magnesium reacts very, very slowly with water.
Give the equation for the reaction of magnesium with water.
Mg+ 2H2O(l) -> Mg(OH)2 + H2
Does magnesium react with steam?
Magnesium reacts with steam.
Give the equation for the reaction of magnesium with steam.
Mg + H20(g) -> MgO + H2O
Why isn’t magnesium hydroxide produced?
The hydroxide isn’t stable at higher temperatures and decomposes to give the oxide and water.
How do the rest of group 2 react with water?
Calcium, strontium and barium all react with cold water to give metal hydroxide and hydrogen.
What would you see in the reaction of group 2 with water?
They all release bubbles of hydrogen in an exothermic reaction.A white precipitate of hydroxide is formed
What happens to the solubility of the sulfates as you go down group 2?
Less soluble in water as you go down the group.
What happens when you add group 2 ions to sodium sulfate?
The metal ion can be added to sodium sulfate. White precipitates are formed.
How can you test for sulfates?
Adding barium ions can be used to test for sulfates. It forms a white insoluble precipitate.
