Why electrode potential of zinc is negative?
In external circuit it is observed that the flow of electrons takes place from Zn to H. Thus it concludes that the electrons must have originated from Zn i.e. it is oxidized and it is anode and it is negative with respect to hydrogen electrode. The standard oxidation potential of zinc is therefore + 0.76V.
So, a positive electrostatic potential at some point means that a positive (negative) charge at that point will have a higher (lower) potential energy compared to the reference point. A negative potential means that a positive (negative) charge at that point will have a relatively lower (higher) potential energy.
- This process defines the electric potential of a point-like charge. Therefore, a system consisting of a negative and a positive point-like charge has a negative potential energy. A negative potential energy means that work must be done against the electric field in moving the charges apart!
- It is possible for a moving object to have negative total mechanical energy. No matter which direction the object is moving must be positive due to the . (I am assuming that mass is also never negative.) Potential energy is also positive because and height is a distance, which is also non-negative.
- Poorly-managed negative emotions are not good for your health. Negative attitudes and feelings of helplessness and hopelessness can create chronic stress, which upsets the body's hormone balance, depletes the brain chemicals required for happiness, and damages the immune system.
Updated: 8th September 2018