AP Chemistry Unit 9

An endothermic reaction that experiences an increase in entropy is

• always spontaneous

• never spontaneous

• spontaneous at HIGH temps

• spontaneous at LOW temps

• I only

• I and III only

• II only

• II and III only

Tags

NGSS.HS-PS3-4

At what temperature would a given reaction become spontaneous if ΔH =+119kJ and ΔS=+263J/K.mol

• 452 K

• 2210 K

• 382 K

• 363 K

Which of the following would have a nonzero enthalpy of formation?

• Fe(s)

• Br₂(s)

• O₂(g)

• Hg(l)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is reduction?

• It is the gain of electrons.

• It is the loss of electrons.

• It is the creation of electrons.

• It is the destruction of electrons.

What is oxidation?

• It is the gain of electrons.

• It is the loss of electrons.

• It is the creation of electrons.

• It is the destruction of electrons.

What is a galvanic (voltaic) cell?

• It is a cell that destroys electrons on one side and creates electrons on the other side.

• It is a cell that contains only one metal bar and one aqueous ion solution.

• It is a type of battery that drives a redox reaction when electricity is applied.

• It is a type of battery that generates an electrical current from redox reactions.

What is a cathode?

• It is the electrode where oxidation takes place.

• It is the electrode where reduction takes place.

• It is an aqueous solution containing an electrode.

• It is the salt bridge that connects half-cells.

What would be the theoretical cell potential of the previous electrochemical cell?

• 1.05V

• -1.05V

• 0.55V

• -0.55V

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Which of the following reactions is most likely to be spontaneous at high temperatures?

• A) An endothermic reaction with a positive entropy change

• B) An exothermic reaction with a negative entropy change

• C) An endothermic reaction with a negative entropy change

• D) An exothermic reaction with a positive entropy change