Knock out the false cell claims

Exercise and reference answers

Questions

1. Question

   Three of these claims about a working galvanic cell are wrong.

   Choices

   1. Item

      Oxidation happens at the anode

      Correct

      Yes

   2. Explanation

      Electrons leave the anode and travel to the cathode.

      Item

      Electrons flow cathode to anode

   3. Explanation

      The salt bridge moves ions between the two compartments.

      Item

      The salt bridge carries electrons

   4. Explanation

      A positive cell potential marks the spontaneous direction.

      Item

      Negative cell potential is spontaneous

2. Question

   Three of these claims about electrolysis are wrong.

   Choices

   1. Explanation

      Sodium ions gain electrons, so sodium forms at the cathode.

      Item

      Molten NaCl gives sodium at the anode

   2. Explanation

      A supply must push a nonspontaneous reaction along.

      Item

      Electrolysis needs no outside power

   3. Item

      It drives a nonspontaneous change

      Correct

      Yes

   4. Explanation

      Hydrogen comes off at twice the volume of oxygen.

      Item

      Water gives equal gas volumes

Instructions

Tap away the three wrong statements in each round and leave the one that survives.

Explanation