Unit 2: Section 3- Period 3 Elements (2.4) Flashcards
What subshell is the outer electron in in Mg and Na?
s subshell
What are the different reactions between magnesium and sodium with water?
sodium more reactive, more readily ionises
magnesium reacts slowly with cold water
State the reaction between sodium and cold water
2Na + 2H2O → 2NaOH + H2
State the reaction between magnesium and cold water
Mg + 2H2O → Mg(OH)2 + H2
State the reaction between magnesium and steam
Mg (s) + H2O (g) → MgO (s) + H2 (g)
How do the period 3 elements react with oxygen?
they all form oxides (except argon) that take up their highest oxidation state
What is the exception for sulphur in oxidation states when reacting with oxygen?
sulphur forms an oxide where the oxidation state of sulphur is +4
What is the oxidation state of the period 3 element in an oxide?
+3 (except sulphur)
What visible changes can you see when sodium reacts with oxygen?
- white solid formed
- yellow flame
State the equation of sodium reacting with oxygen
4Na (s) + O2 (g) → 2Na2O (s)
What colour flame do magnesium, aluminium, silicon and phosphorous burn with?
white flame
What colour flame does sulphur burn with?
blue flame
State the equation between sulphur and oxygen
S (s) + O2 (g) → SO2 (g)
State the equation for magnesium reacting with oxygen
2Mg (s) + O2 (g) → 2MgO (s)
State the equation for aluminium reacting with oxygen
4Al (s) + 3O2 (g) → 2Al2O3 (s)
State the equation for silicon reacting with oxygen
Si (s) + O2 (g) → SiO2 (s)