period 3 Flashcards
What happens when sodium reacts with cold water?
= fizzes around the surface
= 2Na (s) +2H2O (L)
forms
2NaOH (aq)
and h2 (G)
What happens when magnesium reacts with cold water?
= slow
= reacts more radily with steam to produce oxide
= Mg (s) + H2O (g) forms MgO (s) and h2 (g)
What happens when sodium reacts with oxygen?
= yellow flame
= white solid
What happens when magnesium, alumnium, silicon and phosphrous racts with oxygen?
= white flame
= white solid smoke
What happens when sulfur reacts with oxygen?
= burns with blue flame, to form acidic choking gas
what is formed when sodium reacts with oxygen?
= 2Na2O
= 4Na + O2 => 2Na2O
What is formed when magnesiym racts with oxygen?
2MgO
What is formed when aluminium reacts with oxygen?
= 2Al2O3
What is formed when silicon reacts with oxygen?
= SiO2
What happens when phosphrous reacts with oxygen?
= P4O10
What happens when sulfur reacts with oxygen?
= So2
How is sodium stored?
= under oil and phosphrous
= to stop elements under coming contact with oxygen
why do ionic oxidides have high melting and boiling points?
= giant ionic lattices
= strong forces of attraction between oppositley charged ions, requires great deal of energy to break electrstaic orces of attraciton
=ionic due to large electronegative difference between metal and oxygen
= increased charge on the cation makes ionic forces stronger
Why does Al2O3 show covalent properties?
= electonegative difference being less big or alternatvley by small alumnium ion, with a high charge being able to get to a oxide io distorting it
What is the structure of SiO2?
= macrmolecular structure
= there are lots of covalnt bonds syrong, that requires a great deal of energy to break them,
