definitions Flashcards
1
Q
lattice enthalpy
A
- enthalpy change when one mole of an ionic compound is formed from its gaseous ions under standard conditions
2
Q
enthalpy change of formation
A
- enthalpy change
- one mole of a compound
- formed from its elements
- under standard conditions
- all R+P in their standard states
3
Q
enthalpy change of atomisation
A
- enthalpy change
- one mole of gaseous atoms
- formed from the element
- in standard state
- under standard conditions
- endo bc bonds broken
4
Q
first ionisation energy
A
- enthalpy change required
- to remove one electron
- from one mole of each gaseous atom
- to form one mole of gaseous 1+ ions
- endothermic (overcome attraction)
5
Q
first electron affintiy
A
- enthalpy change
- 1 e- added to 1 mole of each atom
- form 1 mol of gaseous 1- ions
- exothermic bc e- added attracted to nucleus
6
Q
enthalpy change of sol
A
- enthalpy change
- 1mol of solute dissolves in solvent
7
Q
enthalpy change of hydration
A
- enthalpy change
- dissolving of gaseous ions
- in water
- forms one mol of aqueous ions
8
Q
pyrimadal
A
one lone pair
3 bonds
107
9
Q
non linear
A
2 lone pair
2 bonds
104.5
10
Q
define electronegativity
A
- ability of a bonded atom
- to attract a pair of e-
- in a covalent bond
11
Q
induced dipole/London forces
A
- movement of e-
- produces changing dipole in a mol
- instantaneous dipole will exist
- position is constantly shifting
- instantaneous dipole induces neighbouring mol
- induced dipole induces furhter dipoles
- attract one another
12
Q
intermolecular
A
weak interactions
between dipoles of diff mol
13
Q
perm dipole dipole
A
HCL perm dipole
positive to negative
14
Q
simple molecular substances
A
- made up of simple mol
- held in place = weak intermol
- atoms bonded by strong c-bonds
- low MP
15
Q
hydrogen bonds
A
found in:
- EN atom with lone pair (O,N,F)
- A H atom attached to EN atom (H-O , H-F , H-N)
