Define Electrodes, Anode, Cathode, Cations & Anions.

Define Electrodes, Anode, Cathode, Cations & Anions.

Electrodes:

These are rods (plates) made up of graphite or metals through which current enters or leave.

 

Anode:
The positive electrode is called Anode.

Cathode:

The negitive electrode is called Cathode.

Moving charges:

There are 2 charges, positive & negative

Negative charge moves towards positive terminal (electrode)

Metals donate electrons forming positive ions

For example:        Na⁺,    K⁺,      Ca²⁺,     Al³⁺

Exceptional case    H⁺    &    NH⁺₄

Non-metals accept electrons forming negative ions

For example:           Cl^-,    Br^-,     I^-,     O^2-

Exceptional case    : CrO^-₄     &    MnO^2-

Cations & Anions:

Metal ions are always attracted towards the negative electrode called cathode forming positive ions.

Positive ions are called Cations.

 

Non-metal ions are always attracted towards the positive electrode called anode forming negative ions.

Negative ions are called Anions.

 

 

                   Class Assessment

1.  Electrodes are rods (plates) made up of graphite or metals. T

2.  The negitive electrode is called Anode. F

3.  The positive electrode is called Cathode. F

4.  Negative ions are called Anions. T

5.  Positive ions are called Cations. T

6.  Metals donate electrons forming positive ions

For example:      

a)            Na⁺,    K⁺,      Ca²⁺,     Al³⁺

b)           Cl^-,    Br^-,     I^-,     O^2-

c)           Both a & b