Entropy

Which of the following two conditions will favor a spontaneous reaction?

• a decrease in entropy and an increase in enthalpy

• a decrease in entropy and a decrease in enthalpy

• an increase in entropy and an increase in enthalpy

• an increase in entropy and a decrease in enthalpy

Which of the following processes has a negative △S

• evaporating 1 mol of a liquid

• freezing 1 mol of a liquid

• raising the temperature of 1 L of water from 295 K to 350 K

• None of the other answer are correct.

Given the change of phase: CO₂(g) changes to CO₂(s), the entropy of the system

• remains the same

• You cannot determine the answer with the given information.

• increases

• decreases

Tags

NGSS.HS-PS3-4

Which tendencies favor a spontaneous reaction?

• decreasing enthalpy and decreasing entropy

• increasing enthalpy and increasing entropy

• increasing enthalpy, and decreasing entropy

• decreasing enthalpy and increasing entropy

The changes in ice to water involve

• and absorption of heat and an increase in entropy

• a release of heat and an increase in entropy

• a release of heat and a decrease in entropy

• an absorption of heat and a decrease in entropy

Tags

NGSS.HS-PS3-4

Based on the equation △G = △H - T△S, a chemical reaction will most likely occur spontaneously if

• △H is + and △S is +

• △H is - and △S is +

• △H is - and △S is -

• △H is + and △S is -

The change of reactants into products will always be spontaneous if the products, compared to the reactants, have

• lower enthalpy and lower entropy

• higher enthalpy and lower entropy

• higher enthalpy and higher entropy

• lower enthalpy and higher entropy

___________ is the randomness or disorder of a thermodynamic system.

• Temperature

• Heat

• Entropy

• Energy

The ________ law of thermodynamics states the entropy of a system not in thermal equilibrium increases.

• first

• second

• third

• Zeroeth

Entropy is a measure of what in a thermodynamic system?

• Energy

• Temperature

• Disorder

• Pressure

Tags

NGSS.HS-PS3-4