3.2.4 Properties of Period 3 elements and their oxides Flashcards
What does the graph look like for the boiling points of period 3 elements?
See card
What is the reaction of sodium with water?
2Na (s) + 2H2O (l) = 2NaOH (aq) + H2 (g)
Reacts violently
Forms a strong alkali
What is the reaction of magnesium with water?
Mg (s) + 2H2O (l) = Mg(OH)2 (aq) + H2 (g) Reacts slowly Or with steam: Mg (s) + H2O (g) = MgO (s) + H2 (g) Reacts more rapidly
How does sodium react with oxygen?
Melts then ignites
4Na (s) + O2 (g) = 2Na2O (s)
How does magnesium react with oxygen?
Bright white flame
2Mg (s) + O2 (g) = 2MgO (s)
How does aluminium react with oxygen?
White sparks formed
4Al (s) + 3O2 (g) = 2Al2O3 (s)
How does silicon react with oxygen?
No observable reaction
Si (s) + O2 (g) = SiO2 (s)
How does phosphorous react with oxygen?
Bright white / yellow flame with white fumes
P4 (s) + 5O2 (g) = P4O10 (s)
How does sulfur react with oxygen?
Blue flame with fumes
S (s) + O2 (g) = SO2 (g)
How does Na2O react with water?
Rapidly
Forms NaOH
pH 13 - 14
How does MgO react with water?
Slowly
Forms Mg(OH)2 (aq)
pH 8 - 10
How does Al2O3 react with water?
No observable change
No product formed
pH 7
How does SiO2 react with water?
No observable change
No product formed
pH 7
How does P4O10 react with water?
Vigorously
Forms H3PO4
pH 2 - 4
How does SO2 react with water?
Forms H2SO3
pH 3 - 5
How does SO3 react with water?
Forms H2SO4
pH 1 - 3
Are metal oxides acids or bases?
Bases
Are non-metal oxides acids or bases?
Acids
What is the trend in the bonding and structure of period 3 oxides?
Na, Mg: ionic bonding, giant ionic
Al: ionic bonding, giant ionic, covalent character
Si: covalent bonding, giant covalent
P, S: covalent bonding, simple covalent
How does Na2O react with HCl?
Na2O + 2HCl = 2NaCl + H2O
How does MgO react with HCl?
MgO + 2HCl = MgCl2 + H2O
How does Al2O3 react with HCl?
Al2O3 + 6HCl = 2AlCl3 + 3H2O
How does Al2O3 react with NaOH?
Al2O3 + 2NaOH + 3H2O = 2NaAl(OH)4
How does SiO2 react with NaOH?
SiO2 + 2NaOH = Na2SiO3 + H2O
