period 3 elements done io yr2 Flashcards
why is Na more reactive than Mg
Because Na only has to lose 1 electron to react whereas Mg has to lose 2. so more energy is needed to lose them.
how does Na react with cold water
Equation?
2Na(s) + 2H2O(g)===== 2NaOH(aq) + H2(g)
observation= molten ball and fizzing
vigorous
how does Mg react with cold water
Equation?
Mg(S) + 2H2O(cold water)===== Mg(OH)2(aq) + H2(g)
Slow with water fast with steam
Thin coating froms of Mgoh on the metal.
how does Mg react with Steam?
Mg(S) + H2O(steam(G))===== MgO + H2
what is S normally oxidised to
S + O2 ==== SO2
How can you oxidise S to SO3
add a vanadium catalyst to SO2 reaction
How quick is the reaction with air(oxygen) in the period 3 oxides
Na, Mg(vigorous)
P(spontaneously combusts)
S(burns readily)
Al, Si (slow)
which of the metal oxides have a covalent structure?
SiO4(macro)
P4O10, SO2(simple)
which of the metal oxides have an ionic structure?
Na2O
MgO
Al2O3
Why does MgO have higher Mp than Na2O
because more charged ion
higher forces of attraction
Why does Al2O3 have a lower Mp than Na2O
Al3+ ion distorts oxygens electron cloud to make it slightly covalent
Which oxides are acidic
ionic oxides
what is the reaction of the ionic oxides in water
Na2O(s) + H2O===== 2NaOH(aq)
MgO(s) + H2O===== Mg(OH)2(aq)
why does MgO form a less alkaline solution than Na2O
because NaOH is more soluble in water.
NaOH is the product formed
Whic Oxides are acidic
covalent oxides are acidic
