chem topic 3A

Question 1

what is lattice energy and what is the trend

Answer 1

the amt of energy released when one mole of a solid ionic compound is formed in the gaseous ions, higher lattice=stronger ionic bond, if charges are the same the lat energy decreases(become less neg) the ionic rad increases, if ionic radius is similar the lattice energy increases (becomes more neg) and ionic charge increases

Question 2

what is covalent bonding

Answer 2

sharing of electrons

Question 3

pros and limitations of lewis structures

Answer 3

pros: shows how atoms are connected in structure, can identify resonance structures

limitations: does not give 3D shape

Question 4

octet rule

Answer 4

atoms in the S and P block tend to gain, lose, or share electrons until they are surrounded by 8 electrons

Question 5

central atom is usually what

Answer 5

usually the least electronegative atom

Question 6

what do you do if you run out of electrons before the central atom has an octet?

Answer 6

use lone pairs from outer atoms to form multi bonds

Question 7

whats the electronegativity scale

Answer 7

NP cov—- <0.5
Pol cov- 0.5-18
ionic- 1.8

Question 8

what is bond polarity

Answer 8

measure of the unequal sharing of electrons

Question 9

electronegativity

Answer 9

how strongly an atom attracts shared electrons in. covalent bond