Group II, The Alkaline Earth Metals Flashcards
As you move down group 2 what happens to the Atomic radius?
Increases
As you move down the group what happens to the solubility of hydroxides?
Increases
As you move down group 2 what happens to the reactivity?
Increases
As you move down group 2 what happens to the speed of reaction with water?
Increases
As you move down the group what happens to the 1st ionisation energy?
Decreases
As you move down the group what happens to the solubility of sulphates?
Decreases
As you move down group 2 what happens to the melting points?
Decreases
weaker metallic bonds as the atomic radius is larger
Why does the melting point of group 2 elements decrease as you move down the group?
The size of the atoms increases and so the attraction between the delocalised electrons and the positive metal ions decreases and so the energy required to break those bonds decreases.
Uses of Mg(OH)₂
Laxative (milk of magnesia)
Uses of Ca(OH)₂
sewage treatment and food processing
Uses of BaSO₄
Radiographic contrast agent
absorbs xrays and is very insoluble
Why is titanium an expensive metal to extract?
cost of Mg
batch process-labour intensive
needs to happen in an inert atmosphere
high temperatures are needed for both steps
What would one observe if they were reacting a group 2 metal in water?
fizzing
the metal dissolving
the solution heating up
with calcium a white precipitate appearing
What are the products of magnesium in steam?
MgO and H₂
What are the products of Magnesium in warm water?
Mg(OH)₂ and H₂
