period 3 oxides Flashcards
reaction of sodium with cold water
fizzes
2Na(s) +2H2O —> 2NaOH + H2
magnesium with steam equation
Mg(s) + H2O(g) —–> MgO (s) +H2
does magnesium react faster slower with hot water than cold water
faster
what colour flame does sodium burn with and what colour is its precipitate
yellow flame
white precipitate
equation of sodium burning in oxygen
4Na(s) +O2(g) —-> 2Na2O
what colour flame and precipitate does Mg produce when burned in O2
white flame
white ppt
what colour flame and precipitate is formed when Al is burned in O2
white flame and white ppt
what colour flame and precipitate is produced when silicon is burned in oxygen
white flame and white ppt
what colour flame and precipitate is formed when phosphorus is burned in oxygen
white flame and white ppt
equation for mg being burned in o2
2Mg(s) + O2(g) –> 2MgO(s)
equation for al being burned in o2
4Al(s) + 3O2 —-> 2Al2O3
equation for si being burned in oxygen
Si(s) + O2 —> SiO2(s)
reaction of phosphorus being burned in oxygen
4P(s) + 5O2 —> P4O10
how many lone pair does so2 have
1
then the two oxygens are both bonded by double bonds
what is the structure of sulphur trioxide
sulphur surrounded by 3 oxygens all with double bonds
what kind of structure do Na2O, MgO and Al2O3 have
ionic
does Al2O3 display covalent character
yes
why does Al2O3 display covalent character
ionic bonding is weakened by charged Al3+ and oxide ions.
why might aluminium oxide react as it should
the high lattice strength of Al2O3 and its solubility in water make an impermeable layer to air and water
what kind of structure do P4O10 AND SO2 have
simple covalent
which has a higher Mpt P4O10 or SO2
SO2 - it is larger - therefore has more e and higher mpt
equation between Na2O and H2o (l)
2Na+(aq) + 2OH- (aq)
this is a vigorous exothermic reaction
pH13
reaction between MgO + h20
Mg(OH)2
pH 9
what do ionic oxides act as
brownsted lowry bases
which is better for treating acid in e.g. rivers or in the stomach NaOH or Mg(OH)2
Mg(OH)2
it is sparingly soluble and weakly alkaline - so using an excess would not make the water majorly alkaline
is aluminum oxide insoluble in water
yes
is silicon dioxide insoluble in water
yes
an equation for the reaction between sodium oxide and sulfuric acid
Na2O(s) + H2SO4 (aq) —–>Na2SO4(aq) + H2O (l)
what do sodium and magnesium oxides react to form
salt and water
but this is ONLY mg and Na
what is the equation between magnesium oxide and hydrochloric acid
MgO(s) +2HCl (aq) —>MgCl2(aq) +H2O(l)
what type of oxide is aluminium oxide
and amphoteric oxide it reacts with both acids and bases
what is the reaction of Al2O3 and HCl
Al2O3 +6HCl —> 2AlCl3 (aq) +3H2O (l)
what is the reaction equation between Al2O3(s) +2NaOH (aq) +3H2O
Al2O3 +2NaOH +3H2O –>2NaAl(OH)4
what will happen to sillicon dioxide when reacted with hot conc sodium hydroxide
it will react as a weak acid with strong bases
a colourless solution of sodium silicate will form
what is the the equation between SiO2 and conc NaOH
SiO2 (s) + 2NaOH (aq) — Na2SiO3 (aq) + H20(l)
what is the overall equation of the reaction of H3PO4 and conc NaOH
3NaOH (aq) +H3PO4—–> Na3PO4(aq) +3H2O
What happens when sulphur dioxide reacts with sodium hydroxide
first
SO2(aq) + NaOH(aq) —> NaHSO3
NaHSO3 +NaOH —-> Na2SO3 +H2O
