concepts of thermodynamics 2

Question 1

What’s the Gibbs free energy equation?

Answer 1

𝚫G = 𝚫H - T𝚫S

Question 2

What does 𝚫Gpositive mean?

Answer 2

Non-spontaneous, will not proceed in the forward direction unless
coupled with an energetically favourable reaction.

Question 3

What does 𝚫G negative mean?

Answer 3

Spontaneous in Forward direction only (irreversible)

Question 4

What does 𝚫G 0 mean?

Answer 4

Reaction at equilibrium, can proceed in either direction (reversible)

Question 5

if the reaction is endothermic, + 𝚫H, - 𝚫S and a + 𝚫G, will the reaction be spontaneous?

Answer 5

never

Question 6

if the reaction is endothermic, +deltaH, +deltaS, +deltaG, will it be spontaneous?

Answer 6

spontaneous on heating

Question 7

if the reaction is exothermic,- deltaH, +deltaS, - delta G, will the reaction be spontaneous?

Answer 7

always

Question 8

if the reaction is exothermic, - deltaH, - deltaS,+ deltaG, will the reaction be spontaneous?

Answer 8

spontaneous on cooling

Question 9

What is the equation for free energy of formation?

Answer 9

𝚫G= products - reactants

Question 10

What is thermochemistry?

Answer 10

the study of heat changes that occur during a chemical reaction

Question 11

What is the bond dissociation enthalpy?

Answer 11

The enthalpy change, per mol, in the
gas phase, when a bond is broken of compound A – B through the reaction

(always positive as bond breaking is an endothermic process)

Question 12

What is the standard enthalpy change of a reaction?

Answer 12

The difference in standard entropy
between the products and reactants of a system under standard conditions

Question 13

What is the standard enthalpy change of formation?

Answer 13

The enthalpy change
when 1 mol of a compound is formed under standard conditions for its
constituent elements in their standard states (∆HӨf of an element = 0)