Inorganic Chapter 3: Period 3 Flashcards
What element do period 3 elements readily react with?
Oxygen
What usually happens when Period 3 elements form oxides?
They’re oxidised to their highest state - exception of Sulfur: it becomes SO2
Which is more reactive - Na or Mg?
Na - takes less energy to form a 1+ ion than a 2+ ion
What is the trend in melting points across period 3?
MgO is higher than Na2O, then they generally decrease from there.
What is the structure of Na2O?
Ionic
What is the structure of SiO2?
Giant Covalent
What is the structure of P4O10?
Simple Covalent
Are Ionic oxides acidic or alkaline?
Alkaline
Are covalent oxides acidic or alkaline?
Acidic
What is the general equation for neutralisation reactions?
Acid + Base -> Salt + Water
What does Amphoteric mean?
It can react as either an acid or a base
Why does MgO have a higher m.p. than Na2O?
The 2+ bonds are stronger than the 1+ bonds
Why does Al2O3 have a lower m.p. than Na2O?
Because the difference in electronegativity between Al and O isn’t as big as between Mg and O, or Na and O, making it partially covalent.
What is the equation for the formation of Phosphoric (V) acid from phosphorus (V) oxide?
P4O10 + 6H2O -> 4H3PO4
What is the equation for the formation of sulfuric (IV) acid from sulfur dioxide?
SO2 + H2O -> H2SO3
