06/11 S&B Flashcards
Why only carbon n silicon can have C.N.S structure?
4 valency - able to form multiple bonds so is able to form a network
(Table)Molecular substance has…
Weak intermolecular forces
What particles do Ionic substances have(NOT FORMED)?
they HAVE
Cations and Anions
What r bond dipoles?
Polarity between two atoms(the arrow thingy)
Bond dipole arrow for H and C?
+left to right-
What is a temporary dipole?
Constant movement of electrons throughout the nucleus
Explain polarity(7 things)
- final shape
- polar bonds
- ē-negative atom
- symmetry
- net dipole
- cancel out
- polarity
Explain shapes(6 things)
- roncs
- central atom
- parent shape
- REPEL into max seperation DUE TO RONC REPULSION
- bonded unbonded regions
- final shape
Which absorbs which releases heat?(endo exo)
endo absorbs
exo releases
Endo reactions?
melting, evaporating, subliming
Exo reactions?
freezing, condensation, deposition
3rd and 4th shell max electrons?
18, 32
(mole)Divide what with n?
n being number of [element]
the fucking enthalpy
malleable(5) n brittle(5) properties?
- metallic bonds
- cations and delocalised ē
- non-directional bonds
- layers shift without breaking
- malleable when pressure applied
break - ionic/covalent bonds
- cations + anions/electrons
- directional bonds
- layers shift n align to repel
- breaks when pressure applied
(Polarity) Dissolving solvents
(polar & nonpolar)non-polar inter forces r weaker, cannot overcome strong polar bonds
(polar & polar)negative attracts positive, strong enough to overcome, can disolve