Bonding And Physical Properties Flashcards

1
Q

Why does Argon has low m.p ?

A
  • Ar is a monatomic noble gas = its single atom has electrons that are close to nucleus = difficult to polarise
  • full electron shells = stable, unreactive
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Trend of m.p of period 3

A
  • m.p increase from Na to Al
  • silicone has highest m.p
  • phosphorus to argon m.p decrease
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why is m.p of Na - Al increase ?

A
  • nuclear charge increase as more protons -) across period
  • smaller atomic radius
  • stronger attraction between + ions and delocalised e- = stronger metallic bond
    = more energy needed to break the strong bond
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why does silicone have the highest m.p in period 3 ?

A
  • macromolecular structure = strong covalent bonds = strong electrostatic attraction = more energy needed to break the bond
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Why does m.p decrease from P- Ar ?

A
  • P,S,Cl, Ar are all non metal elements and simple molecular elements of molecular structure
  • weak VDW forces that are easy to overcome = less energy needed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Why does sulfur has higher m.p than phosphorus ?

A
  • S has a larger molecule S8 than P4 = more e- = stronger VDW forces between molecules = more energy needed to overcome the force
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Explain why it is important to stir the reaction mixture before recording values? (1)

A
  • ensures all solution in the flask is at the same temperature
How well did you know this?
1
Not at all
2
3
4
5
Perfectly