Periodicity- Period 3 Flashcards
Which of the period 3 oxides are purely ionic?
Sodium and Magnesium
Which of the period 3 oxides is ionic with covalent characteristics?
Aluminium
Which of the period 3 oxides is giant covalent?
Silicon
Which of the period 3 oxides are molecular covalent?
Phosphorous and Sulphur(S=gas)
How do you produce SO3?
SO2 + O2, heated with V2O5 catalyst
Why does Al2O3 have a higher melting point than Na2O?
The charge on Al3+ is higher than Na+ which results in a stronger attraction between the oppositely charged ions.
Why has silicon oxide got the highest melting point out of all the oxides?
Si02 is a giant covalent structure which has strong covalent bonds which requires greater amounts of energy to break
Why does SO3 have a lower melting point compared to P4O10
It is a smaller molecules, weaker Van der Waals forces between the molecule.
Which of the oxides are basic and which are acidic?
Na and Mg= basic
Al= Amphoteric
Si-S=Acidic
Why are all ionic oxides basic?
Contain oxide ion, which is strongly basic and reacts with water to produce the hydroxide ion.
Why are all covalent oxides acidic?
Do not contain ions, but they have a strongly positive dipole on the period 3 atom. This will attract the lone pair on water which releases hydrogen ions
Which of the period 3 elements will reduce water to hydrogen gas?
Na-Si
Which of the period 3 elements do not react with water?
P & S
What are the products when chlorine reacts with water?
HClO + HCl
