AP Chemistry Spontaneity Entropy and Free Energy

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

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

Tags

NGSS.HS-PS3-4

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

Which phrase best describe the following reaction 2H₂ + O₂ --> H₂O + energy?

• endothermic, absorbing energy

• endothermic, releasing energy

• exothermic, releasing energy

• exothermic, absorbing energy

Tags

NGSS.HS-PS1-4

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

The heat of reaction (△H) is equal to the

• entropy of the reactants minus the entropy of the products

• entropy of the products minus the entropy of the reactants

• heat content of the reactants minus the heat content of the products

• heat content of the products minus the heat content of the reactants

Tags

NGSS.HS-PS1-4

The sequence of steps that occurs in a reaction process is called the

• reaction mechanism.

• order of the reaction.

• rate law.

• overall reaction.

How does the energy of the activated complex compare with the energies of the reactants and products?

• It is lower than both the energy of the reactants and the products.

• It is higher than the energy of the reactants but lower than the energy of the products

• It is higher than both the energy of the reactants and the products.

• It is lower than the energy of the reactants but higher than the energy of the products.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-1

When a catalyst is added to a reaction, a decrease occurs in the

• activation energy

• heat of reaction

• potential energy of the reactants

• potential energy of the products