PERIOD 3 Flashcards
what observations can be seen when sodium burns in oxygen? (1)
Sodium burns with a yellow flame to
produce a white solid.
what observations can be seen when Mg, Al, Si and P burns in oxygen? (1)
Mg, Al, Si and P burn with a white flame
to give white solid smoke
what observations can be seen when sulphur burns in oxygen? (1)
S burns with a blue flame to form an acidic choking gas
what observations can be seen when sodium burns in cold water?
Sodium reacts with cold water. It fizzes
around on surface etc.
what structures do metal oxides form? (1)
They have Ionic giant lattice structures: strong forces of attraction between
ions.
what are the ionic oxides in period 3? (3)
Na2O, MgO, Al2O3
what are the macromolecular oxides in period 3? (1)
SiO2 is Macromolecular
what are the simple molecular oxides in period 3? (2)
P4O10 (s), SO2 (g) are simple molecular with weak intermolecular forces between molecules.
how is aluminium layer protected from corrosion? (2)
by a thin layer of aluminium oxide. The
high lattice strength of aluminium oxide and its insolubility in water make this layer impermeable to air and water.
Sodium is stored under oil and phosphorus under water to stop these
elements coming into contact and reacting with air.
how to metal ionic oxides tend to react in water? (1)
Metal ionic oxides solutions across the period. tend to react with water to form hydroxides which are alkaline
why do aluminium oxide and silicon oxide not dissolve in water?
do not dissolve in water because of the high strength of the Al2O3 ionic lattice and the SiO2 macromolecular structure.
how do non-metal, simple molecular, covalent, oxides react with water? (1)
they give acids.
what products are observed when phosphorus oxide reacts with water? (2)
forms phosphoric acid (H3PO4)
pH= 0
what products are observed when sulphur dioxide reacts with water? (2)
sulphuric acid (III) (H2SO3)
pH= 3 (weak acid)
what products are observed when sulphur trioxide reacts with water? (2)
sulphuric acid (V) (H2SO4)
pH= 0
