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Chemistry: Electrochemistry Flashcards

7 cards from real AP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In an electrolytic cell, the source of energy driving the nonspontaneous reaction is:

    Answer: An external power supply

    Electrolytic cells require an external power source to drive nonspontaneous reactions.

  2. How does the sign of the anode differ between galvanic and electrolytic cells?

    Answer: Negative in galvanic, positive in electrolytic

    The anode is negative in a galvanic cell but positive in an electrolytic cell.

  3. Faraday's constant (about 96,485 C/mol) represents the charge of:

    Answer: One mole of electrons

    Faraday's constant is the total charge carried by one mole of electrons.

  4. During electrolysis of molten NaCl, what forms at the cathode?

    Answer: Sodium metal

    Na⁺ ions are reduced to sodium metal at the cathode.

  5. If 2.0 mol of electrons pass through a cell depositing a +2 metal, how many moles of metal are deposited?

    Answer: 1.0 mol

    Each metal ion requires 2 electrons, so 2.0 mol electrons deposit 1.0 mol of metal.

  6. How much charge passes when a current of 5.0 A flows for 200 seconds?

    Answer: 1000 C

    Charge Q = I × t = 5.0 A × 200 s = 1000 C.

  7. In the electrolysis of aqueous NaCl (brine), why is hydrogen often produced instead of sodium at the cathode?

    Answer: Water is more easily reduced than Na⁺

    Water has a more favorable reduction potential than Na⁺, so H₂ is produced preferentially.