group 17 Flashcards
1
Q
bond enthalpy
A
heat needed to break one mole of a covalent bond
2
Q
volatility
A
how easily a substance can evaporate
3
Q
characteristics of volatile substance
A
low melting and boiling point
4
Q
how to know if the attraction of the atom is strong?
A
if bonding pair is closer to 2 nuclei
5
Q
characteristics of halogens
A
- simple molecular structure
- weak van der Waal’s forces between diatomic molecules caused by instantaneous dipole-induced dipole forces
- oxidising agent
6
Q
when does instantaneous dipole-induced dipole happen?
A
when more of the electrons happen to be at one end of the molecule than the other
7
Q
electronegativity
A
how strongly an atom attracts electrons towards itself in covalent bond
8
Q
thermal stability
A
how well a substance can resist breaking down when heated
9
Q
why use ammonia
A
- helps distinguush between AgCl, AgBr, and AgI based in solubility in solution
- forms complex ion with Ag, shifting equilibrium and dissolving precipitate
