Energetics (R1) Flashcards
(15 cards)
What is entropy?
a measure of the amount of disorder of the particles in a system
The increase in temperature will generally cause the entropy to…
increase
When the entropy increases (physical and chemical examples)?
- solid to liquid to gas
- increase in number of moles of gas
- when the number of moles in general increases
What’s the equation for calculating entropy?
What is the enthalpy and entropy of spontaneous reactions?
enthalpy: negative
entropy: positive
What is the enthalpy and entropy of non-spontaneous reactions?
enthalpy: positive
entropy: negative
What does negative Gibbs free energy indicate?
spontaneous reaction
When enthalpy and entropy are both negative, when the reaction will be spontaneous?
at low temperatures
When enthalpy and entropy are both positive, when the reaction will be spontaneous?
at high temperatures
When Gibbs free energy is O in equilibrium, what is the value of Kc?
1
When Gibbs free energy is negative in equilibrium, what is the value of Kc?
Kc > 1
When Gibbs free energy is positive in equilibrium, what is the value of Kc?
Kc < 1
When Gibbs free energy is negative then it tends to favour reactants/products?
products
When Gibbs free energy is positive then it tends to favour reactants/products?
reactants
How to calculate the Kc (equilibrium constant) from Gibbs free energy?
use
