Chemical Bonding Flashcards
How is a sigma bond formed?
Direct overlap of atomic orbitals
How is a pi bond formed?
Lateral overlap of orbitals
What is covalent bonding?
Bond formed by a shared pair of electrons
What is an ionic bond?
Force of attraction between oppositely charged particles
What is a polar covalent bond?
Where electrons are not shared evenly between the atoms
What is a non-polar covalent bond?
Where electrons are shared evenly between the atoms
State the octet rule
Atoms react so that each energy level contains the maximum amount of electrons
Properties of ionic compounds?
1) High melting/boiling point
2) Usually solid at room temp
3) Conduct electricity when dissolved
Properties of covalent compounds?
1) Low melting/boiling point
2) Usually liquid/gas at room temp
3) Do not conduct electricity
What are the 4 main general formulas for shapes of molecules?
AB
AB2
AB3
AB4
What is a bond pair?
2e- in a bond
What is a lone pair?
2e- not in a bond
What has the weakest repulsion according to VSEPR theory?
Bond pair + bond pair
What has the highest repulsion according to VSEPR theory?
Lone pair + lone pair
What has a medium repulsion according to VESPR theory?
Lone pair + bond pair