REVISION Flashcards
1
Q
Define the unified atomic mass unit. (1mrk)
A
(The mass of) one twelfth of the mass of a carbon - 12 atom or isotope.
2
Q
Define relative atomic mass, Ar, in terms of the unified atomic mass (1mrk)
A
The average mass of the isotopes of an element compared to the unified atomic mass unit.
3
Q
Define enthalpy Change of neutralisation, △Hₙₑᵤₜ (2mrks)
A
○ the energy change when 1 mole of water is formed
○ from an (aqueous) acid and an alkali /aqueous base
4
Q
what does VSEPR stand for?
A
Valence Shell Electron Pair Repulsion
5
Q
A
6
Q
A
