1st Law Of Thermodynamics

Question 1

What is Hess’s law?
(Definition)

Answer 1

Enthalpy change going from reactants to products is independent of reaction path taken

Question 2

What is Hess’s Law?
(Equation)

Answer 2

Question 3

If ΔH is negative, what does this mean for the reaction?

Answer 3

That the reaction is exothermic (heat released)

Question 4

If ΔH is positive, what does this mean for the reaction?

Answer 4

That the reaction is endothermic (heat absorbed)

Question 5

What does Gibbs Free Energy determine?

Answer 5

Determines the spontaneity of a reaction

Question 6

What is the Gibbs Free Energy equation?

Answer 6

Question 7

What does a negative ΔG mean for the reaction?

Answer 7

ΔG negative = exergonic (spontaneous as written)

Question 8

What does a positive ΔG mean for the reaction?

Answer 8

ΔG positive = endergonic (reverse reaction spontaneous)

Question 9

What is Entropy?
(Definition)

Answer 9

The measure of energy dispersal throughout a system and its surroundings

Question 10

What is the heat energy equation?
(Equation)

Answer 10

Q=mcΔt

Question 11

What do each of the terms in Q=mcΔt mean?

Answer 11

Q = the heat change (Joules)
m = mass of the object/substance being heated
c = the specific heat capacity of the object/substance
Δt = the change in temperature in °C

Question 12

What is the Second Law of Thermodynamics?

Answer 12

That an isolated system will progress towards a state with the highest entropy