Explain the trend in reactivity down group 2
reactivity increases as shielding and the atomic radius increases and nuclear attraction on the outer electron and ionisation energy decreases
what can u observe from the combustion of group 2 metals and how does that change down the group (give e.g of equation)
-bright light and white solid formed
-as you go down the group a brighter will form and the white solid will form faster
- 2Mg(S) + O2(g) —-> 2MgO(g)
whats the general equation for a group 2 metal (M) reacting with water
M(s) + 2H20 —> M(OH)2(aq) + H2
except with magnesium reacting with STEAM forms MgO and also Beryllium doesn’t react with water
what observation would you see from a group 2 metal reacting with water and how would that change down the group
-metal dissolving and fizzing
-down the group both will happen faster
what are the two trends down the group of group 2 hydroxides
-solubility increases
-pH increases
this is because there are more OH- ions so the solution (since more do dissolve) is more alkaline
whats the equation between a generic group 2 metal and HCL
M(s) + HCL(aq) —> MCl2(aq) + H2(g)
what is the use of Mg(OH)2
It neutralises excess stomach acid
what is the use of Ca(OH)2
neutralises acidic soils
what is tbe use of CaCO3
this is limestone or choke or marble
thermal decomposition gives CaO which is ues to make cement
