Periodicity Flashcards
Why is Sodium more reactive than Magnesium?
As the amount of energy required to remove an electron from sodium is lower than it is to remove 2 with magnesium.
State the equation for Sodium reacting with water
2Na (s) + 2H2O (l) 2NaOH (aq) + H2 (g)
What observations can be made when sodium reacts with water?
It reacts vigorously forming a ball and fizzing, forming a strong alkaline solution (pH = 12 – 14)
State the equation for Magnesium reacting with water
Mg (s) + 2H2O (l) Mg(OH)2 (s) + H2 (g)
State the equation when Magnesium reacts with steam
Mg (s) + H2O (l) MgO (s) + H2 (g)
What observations can be made when magnesium reacts with water/steam?
Few bubbles and reacts slowly with water forming a weak alkaline solution as its not very soluble (pH = 9) Much faster with steam to form magnesium oxide
Why does magnesium react slowly in water?
This is because it requires more energy to lose 2 electrons
State the equation for Sodium reacting with Oxygen
4Na + O2 –> 2Na2O
What observations can be made when sodium reacts with oxygen?
Burns with yellow-orange flame to produce white powder
State the equation for Magnesium reacting with Oxygen
2Mg + O2 2MgO
What observations can be made when Magnesium reacts with oxygen?
Burns with white flame to produce white powder
State the equation for Aluminium reacting with Oxygen
4Al + 3O2 2Al2O3
What observations can be made when Aluminium reacts with oxygen?
Burns with white flame to produce white powder
State the equation for Silicon reacting with Oxygen
Si + O2 SiO2
What observations can be made when silicon reacts with oxygen?
Burns with white flame to produce white powder