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,
What are the structures of p4O10 and so2?
= simple molecalr structures, these are small, and have weak intermolecular forces between molecules, vanderwall forces,
= small electrongeatibe differenve
= p4o10 is bigger, so has more vabderwall forces as there are more elecyrons, so stronger vanderall orcws and more surfce area forformation of these forces
Why is aluminium metal protected from corrosion?
= thin layer of aluminium oxide
