Properties Of Period 3 Elements Flashcards
Sodium reaction w water
2Na(s) + 2H2O —-> 2NaOH + H2
Magnesium reaction w water
Mg(s) + 2H2O —-> Mg(OH)2 + H2
Sodium reaction w oxygen
2Na(s) + 1/2 O2 —-> Na2O
Magnesium reaction w oxygen
2Mg(s) + O2 (g) —-> 2MgO
Aluminium reaction w oxygen
4Al (s) + 3O2 (g) —-> 2Al2O3
Sodium oxide reaction w water at high high ph
Na2O(s) + H2O (l) ——> 2Na+ (aq) + 2OH-
Magnesium oxide reaction with water (ph 9-10)
MgO(s) + H2O(l) ——> Mg(OH)2 (aq)
Sodium oxide + sulfuric acid
Na2O (s) + H2SO4 (aq) —> Na2SO4(aq) + H2O
phosphorus reaction with oxygen
P4(s) + 5O2(g) —-> P4O10
why does Al2O3 have more covalent character than MgO
Al3+ ion smaller than Mg2+ ion
means Al3+ more polarising than Mg2+
this distorts elctron cloud around O2- ion more so that there is more elctron density shared between two ions
what does amphoteric mean
act as acid or base
does the size of the metal ion increase or decrease as you go across period 3
decrease
-inc strentgh of ions
phosphorus oxide reaction w water
P4O10 + 6H2O —-> 4H3PO4
what flame forms when you burn sodium in air and what else is produced
orange flame to produce white solid mixture of sodium iodide and sodium peroxide
colour flame when magnesium burns in oxygen
bright white flame