Unit 5 Periodicity Flashcards
1
Q
Why do P4O10 and SO2 have low melting points?
A
Because they are covalent and therefore only have weak intermolecular forces (van der waals)
2
Q
Which period 3 oxides are acidic?
A
SiO2
P4O10
SO2
3
Q
Which period 3 oxides is amphoteric
A
Al2O3
4
Q
Which period 3 oxides are insoluble in water?
A
Al2O3 and SiO2
5
Q
Why is SO2 harmful?
A
It dissolves in water to forming acid rain, causing corrosion
6
Q
What is the pH of SO2 and SO3 when dissolved in water?
A
SO2 - 2-4
SO3 - 1-3
7
Q
What is the equation for when sodium reacts with water?
A
2Na + 2H2O –> 2NaOH + H2
8
Q
What oxide is formed when Mg reacts with water?
A
MgO
9
Q
What is the bonding In SiO2?
A
Giant molecular
10
Q
Which period 3 oxides are ionic?
A
Na2O and MgO
