Quiz on unit 9 must knows

#1 Which of the following definitions matches the term?

Cell potential equation

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 as V goes up, so does S as the more temperature, the more energy, the mor entropy 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!! galvanic = anode is negative and cathode is positive electrolytic = anode is positive and cathode is negative

#2 Which of the following terms matches the definition?

thermodynamically unfavorable

entropy non-spontaneous is... charging a battery vs using a battery is H < 0 and S < 0

#3 Which of the following terms matches the definition?

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

overall cell reaction is H > 0 and S > 0 is H < 0 and S > 0 2nd law with entropy

#4 Which of the following terms matches the definition?

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

charging a battery vs using a battery cell potential, Ecell, electromotive force (emf) Cell potential equation 2nd law with entropy

#5 Which of the following terms matches the definition?

True

False

Section 1: Multiple Choice questions

Cell potential equation

thermodynamically unfavorable

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

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

galvanic = anode is negative and cathode is positive electrolytic = anode is positive and cathode is negative

Section 2: True/false questions

oxidation half-reaction

as temperature goes to zero, entropy approaches a constant value

anode

oxidation happens, losing electrons

voltage equation

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

cathode

delta G and the energy of the product is lower than that of the reactants 1. G = negative = k>1; G = positive = k

galvanic cell

**delta G = delta H - (T * delta S) gibbs free energy = enthalpy - (temperature times entropy) *note T is in kelvin, not Celsius**

Triple-checked your answers?

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