Quiz on unit 9 must knows

#1 Which of the following terms matches the definition?

Ecell = E (cathode) - E (anode) IMPORTANT: if the reaction gets reversed (in order to balance, sometimes it will need to be reversed), the sign of the Ecell must switch, however if it gets multiplied (in order to balance) IT REMAINS THE SAME!!

Cell potential equation overall cell reaction G, S, H exergonic reaction

#2 Which of the following terms matches the definition?

thermodynamically unfavorable

is H > 0 and S > 0 if a reaction is kinetically favorable non-spontaneous is... galvanic cell

#3 Which of the following terms matches the definition?

y + z --> Y+ + Z- (G<0)

cell potential, Ecell, electromotive force (emf) how do you calculate Gibbs free energy overall cell reaction overall cell reaction

#4 Which of the following definitions matches the term?

cell potential, Ecell, electromotive force (emf)

delta G = delta H - (T * delta S) gibbs free energy = enthalpy - (temperature times entropy) *note T is in kelvin, not Celsius 1 joule of work / coulomb of charge transferred J/C = units reduction happens, gaining electrons V = IR voltage = current (amps) * resistance (ohms)

#5 Which of the following definitions matches the term?

galvanic cell vs electrolytic cell

galvanic = anode is negative and cathode is positive electrolytic = anode is positive and cathode is negative reduction happens, gaining electrons a reaction can be coupled with a reaction that is favorable to push it forward Examples: - photosynthesis - ATP - Charging a battery with electricity chemical energy is converted to electrical energy with spontaneous redox reaction Voltage consists of oxidizing agent in one compartment that pulls electrons through a wire from a reducing agent

#6 Determine if the following combination is true or false.

oxidation half-reaction

x --> X+ + e-

True

False

#7 Determine if the following combination is true or false.

anode

it has k>1, relatively low activation energy

True

False

#8 Determine if the following combination is true or false.

voltage equation

charging = non-spontaneous using = spontaneous

True

False

#9 Determine if the following combination is true or false.

cathode

reduction happens, gaining electrons

True

False

#10 Determine if the following combination is true or false.

galvanic cell

chemical energy is converted to electrical energy with spontaneous redox reaction Voltage consists of oxidizing agent in one compartment that pulls electrons through a wire from a reducing agent

True

False

Section 1: Multiple Choice questions

Ecell = E (cathode) - E (anode) IMPORTANT: if the reaction gets reversed (in order to balance, sometimes it will need to be reversed), the sign of the Ecell must switch, however if it gets multiplied (in order to balance) IT REMAINS THE SAME!!

thermodynamically unfavorable

y + z --> Y+ + Z- (G<0)

cell potential, Ecell, electromotive force (emf)

galvanic cell vs electrolytic cell

Section 2: True/false questions

oxidation half-reaction

x --> X+ + e-

anode

it has k>1, relatively low activation energy

voltage equation

charging = non-spontaneous using = spontaneous

cathode

reduction happens, gaining electrons

galvanic cell

chemical energy is converted to electrical energy with spontaneous redox reaction Voltage consists of oxidizing agent in one compartment that pulls electrons through a wire from a reducing agent

Triple-checked your answers?

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