L3: Bond Strengths And Phases Of Matter Flashcards
1
Q
Discuss Energy considerations and enthalpy
A
Desire for minimum energy
If E put into system enthalpy change is positive -likely to be thermodynamically unfavourable
If E is negative and thus E given out, reaction is favourable
2
Q
What does the depth of the potential energy curve represent?
A
The strength of the bond between the atoms
Deeper curve- larger E required to separate atoms, so stronger bond
3
Q
What is a typical bond length?
A
o
15-30 A
o
1 A = 1x 10^-10m
4
Q
Describe the heating of a liquid
A
Within the liquid, bonds within clusters are constantly breaking and reforming as E is exchanged between them
Further heating breaks remaining bonds so liquid becomes gas
