Chem

Question 1

How to find steric number

Answer 1

Number of atoms bonded to central atom plus number of lone pairs

Question 2

Bonding group just means

Answer 2

How many atoms the central atom is bonded to

Question 3

Drawing molecular orbital diagram

Answer 3

Use general electron numbers to find which diagram you use, then only VALENCE electrons are put into the orbitals :)

Question 4

Kinetic energy equals

Answer 4

Energy of photon MINUS work function

Question 5

Lattice energy

Answer 5

Will increase as you increase charge
As distance between ions increases, lattice energy decreases

Question 6

Which alkanes are most reactive

Answer 6

The shorter chain ones

Question 7

If there are two oppositely charged ions, the forces are stronger than hydrogen bonding!!!!!

Question 8

Formal charges should be as CLOSE AS POSSIBLE to the overall charge of ion

Question 9

Binding energy

Answer 9

Mass defect (mass of particles - mass of atom)
Convert to MeV
Divide by nucleons

Question 10

Is ice melting endo or exothermic?

Answer 10

endothermic

Question 11

is water freezing endo or exothermic?

Answer 11

exothermic

Question 12

negative G value means …

Answer 12

spontaneous

Question 13

positive G value means …

Answer 13

non spontaneous

Question 14

delta G = 0 …

Answer 14

process is reversible and at equilibrium

Question 15

standard enthalpy of the reaction

Answer 15

H (products) - H (reactants)

Question 16

Q > K

Answer 16

reaction proceeds towards reactants
think k is better than q bc we learned it first

Question 17

which direction will a reaction go when delta G is positive?

Answer 17

reverse

Question 18

which direction will a reaction go when delta G is negative?

Answer 18

forward

Question 19

K > 1

Answer 19

forward reaction is favored

Question 20

K < 1

Answer 20

reverse reaction is favored

Question 21

delta G and Kc formula

Answer 21

deltaG = -RT ln K

Question 22

delta H negative, delta S positive

Answer 22

exothermic (bc H is negative), entropy is getting greater (bc S is positive)
delta G is negative at all temps, and spontaneous at all temps

Question 23

delta H positive, delta S negative

Answer 23

endothermic,
delta G is positive at all temps, and non spontaneous at all temps

Question 24

delta H negative, delta S negative

Answer 24

reaction is spontaneous at low temperatures
non spontaneous at high temps

Question 25

delta H positive, delta S positive

Answer 25

reaction is non spontaneous at low temps spontaneous at high temps