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!!

is H < 0 and S < 0 anode 1st law of thermodynamics Cell potential equation

#2 Which of the following definitions matches the term?

non-spontaneous is...

thermodynamically unfavorable it has k>1, relatively low activation energy T=100k spontaneous, low temperature, T delta S is small charging = non-spontaneous using = spontaneous

#3 Which of the following definitions matches the term?

overall cell reaction

(sum of S products) - (sum of S reactants) DO NOT FORGET TO ACCOUNT FOR THE MOLES IN THE REACTION!!! y + z --> Y+ + Z- (G<0) x --> X+ + e- oxidation happens, losing electrons

#4 Which of the following terms matches the definition?

1 joule of work / coulomb of charge transferred J/C = units

cell potential, Ecell, electromotive force (emf) is H < 0 and S < 0 if a reaction is thermodynamically favorable 2nd law with entropy

#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 a reaction can be coupled with a reaction that is favorable to push it forward Examples: - photosynthesis - ATP - Charging a battery with electricity reduction happens, gaining electrons thermodynamically unfavorable

#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

a reaction can be coupled with a reaction that is favorable to push it forward Examples: - photosynthesis - ATP - Charging a battery with electricity

True

False

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

voltage equation

**V = IR voltage = current (amps) * resistance (ohms)**

True

False

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

cathode

(sum of S products) - (sum of S reactants) DO NOT FORGET TO ACCOUNT FOR THE MOLES IN THE REACTION!!!

True

False

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

galvanic cell

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

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!!

non-spontaneous is...

overall cell reaction

1 joule of work / coulomb of charge transferred J/C = units

galvanic cell vs electrolytic cell

Section 2: True/false questions

oxidation half-reaction

x --> X+ + e-

anode

a reaction can be coupled with a reaction that is favorable to push it forward Examples: - photosynthesis - ATP - Charging a battery with electricity

voltage equation

**V = IR voltage = current (amps) * resistance (ohms)**

cathode

(sum of S products) - (sum of S reactants) DO NOT FORGET TO ACCOUNT FOR THE MOLES IN THE REACTION!!!

galvanic cell

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

Triple-checked your answers?

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