Heat Exam

Question 1

Enthapy is the

Answer 1

∆Hrxn

Question 2

Heat of formation formula must have…

Answer 2

Pure elements

Question 3

Show charges for…

Answer 3

Dissociation rxns

Question 4

Find heat w/ direct method by _____ - _____

Answer 4

Product minus reactant

Question 5

Breaking bonds re___ energy, it is ___thermic

Answer 5

Requires, endothermic

Question 6

Making bonds re___ energy, it is ___thermic

Answer 6

Releases, exothermic

Question 7

∆G is the

Answer 7

Thermodynamic favorability

Question 8

∆H is the

Answer 8

Enthalpy

Question 9

-∆G means a reaction is

Answer 9

Favored in the forward reaction

Question 10

∆S is the

Answer 10

Change in entropy / “disorder”.

Question 11

∆S will be positive if

Answer 11

There are more mols of disorder on the RIGHT side

Question 12

∆S will be negative if

Answer 12

There are more mols of disorder on the LEFT sife

Question 13

– ∆H, + ∆S means

Answer 13

-∆G, fwd rxn favored at all temps

Question 14

+∆H, –∆S means

Answer 14

+∆G, fwd rxn never favored, reverse rxn is

Question 15

+∆H, +∆S means

Answer 15

-∆G at high T, favored ABOVE some threshold temp

Question 16

-∆H, -∆S means

Answer 16

-∆G at low t, favored BELOW some threshold temp

Question 17

K, the equilibrium constant, is

Answer 17

(products)^(coefficient) / (Reactant)^(coefficient)

Question 18

Work formula

Answer 18

– P∆V(101.3) – in J, atm, and L

Question 19

-W means

Answer 19

Gas is expanding, ∆V is +, system is doing work on surroundings

Question 20

+W means

Answer 20

Gas is being compressed, ∆V is -, surroundings do work on system

Question 21

∆G in relation to ∆S and ∆H

Answer 21

∆G = ∆H –T∆S