Inorganic II- Period 3 elements Flashcards
(18 cards)
What is the equation for the reaction between sodium and water?
2Na + 2H2O → 2NaOH + H2
What is the equation for the reaction between magnesium and cold water?
Mg + 2H2O → Mg(OH)2 + H2
Why is sodium more reactive than magnesium?
Sodium only has to lose one electron to form an ion whereas magnesium has to lose two. Therefore less energy is needed to ionise sodium, making it more reactive.
What is the equation for the reaction between magnesium and steam?
Mg + H2O → MgO + H2
Which observation can be made when magnesium reacts with steam?
Burns with a bright white flame.
What are the oxides of period 3 elements?
Na2O
MgO
Al2O3
SiO2
P4O10
SO2
SO3
What are the conditions of the reaction to form SO3?
High temperatures and a catalyst
What is the trend of the melting points of oxides down group 3?
Increases from Na2O to MgO and then steadily decreases.
Which period 3 oxide(s) are ionic?
Na2O and MgO
Which period 3 oxide(s) are ionic with covalent character?
Al2O3
Which period 3 oxide(s) are macromolecular?
SiO2
Which period 3 oxide(s) are simple covalent?
P4O10 and SO2
What are the equations of the reactions of the simple covalent group 3 oxides with water?
P4O10 + 6H2O → 4H3PO4
SO2 + H2O → H2SO3
SO3 + H2O → H2SO4
What are the equations of the reactions of ionic group 3 oxides with acids?
Na2O + 2HCl → 2NaCl + H2O
MgO + H2SO4 → MgSO4 + H2O
What are the equations of the reactions of covalent group 3 oxides with bases?
SiO2 + 2NaOH → Na2SiO3 + H2O
P4O10 + 12NaOH → 4Na3PO4 + 6H2O
SO2 + 2NaOH → Na2SO3 + H2O
SO3 + 2NaOH → Na2SO4 + H2O
What is aluminium oxide?
Amphoteric- can act as both an acid and a base.
What are the equations for the reactions of aluminium oxide?
Al2O3 + 3H2SO4 → Al2(SO4)3 + 3H2O
Al2O3 + 2NaOH + 3H2O → 2NaAl(OH)4
