The cathode is always positive. The anode is always negative. The cathode is the

Question

The cathode is always positive.

The anode is always negative.

The cathode is the electrode where the oxidation takes place.

Both oxidation and reduction make take place at the cathode, depending on the cell.

The cathode is the electrode where the reduction takes place.

True

False

Complete and balance the following redox equation. Now sum the coefficients of all species in the balanced equation. (Remember to add the coefficients that are equal to one, and to add the coefficients of any species added to the equation.) The sum of the smallest whole number coefficients is

16

4

25

32

13

Explanation / Answer

1.Correct statement:- The cathode is the electrode where the reduction takes place.

Cathode polarity with respect to the anodecan be positive or negative; it depends on how the device operates. Although positively charged cations always move towards the cathode (hence their name) and negatively charged anions move away from it, cathode polarity depends on the device type, and can even vary according to the operating mode. In a device which takes energy (such as recharging a battery), the cathode is negative, and in a device which provides energy (such as discharging a battery), the cathode is positive.

In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive. This seems reasonable as the anode is the source of electrons and cathode is where the electrons flow.

However, in an electrolytic cell, the anode is taken to be positive while the cathode is now negative. However, the reaction is still similar, whereby electrons from the anode flow to the positive terminal of the battery, and electrons from the battery flow to the cathode.

2. False

The cathode is the electrode where reduction (gain of electrons) takes place; in a galvanic cell

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