No, reaction cannot be spontaneous (continue to happen) when the change in gibbs free energy is positive. ... For a spontaneous process to happen , the change in Gibbs free energy must be negative. A roaring bonfire is an example of a spontaneous reaction.

The Gibbs free energy change for a cell reaction is a measure of the spontaneity of the reaction and can be used to predict whether a reaction is thermodynamically favorable or not. The sign of the Gibbs free energy change (∆G) indicates the direction in which the reaction will proceed.

When the ∆G for a cell reaction is positive, it indicates that the reaction is non-spontaneous. This means that the reaction will not occur spontaneously on its own and instead requires an input of energy to proceed. In other words, the reactants have a higher free energy than the products, and energy needs to be supplied to overcome the energy barrier and drive the reaction forward.

Explanation:

1. Spontaneity of a reaction:
The spontaneity of a reaction refers to the tendency of a reaction to occur without any external influence. In a spontaneous reaction, the reactants will naturally convert into products, releasing energy in the process. Spontaneous reactions have a negative ∆G value.

2. Gibbs free energy change (∆G):
The Gibbs free energy change (∆G) is a thermodynamic property that combines the enthalpy change (∆H) and the entropy change (∆S) of a reaction. It is given by the equation ∆G = ∆H - T∆S, where T is the temperature in Kelvin.

3. Positive ∆G:
When the ∆G for a cell reaction is positive (∆G > 0), it means that the free energy of the products is higher than that of the reactants. This indicates that the reaction is non-spontaneous and will not occur on its own.

4. Non-spontaneous reaction:
A non-spontaneous reaction requires an input of energy to proceed. This can be achieved by supplying an external source of energy, such as electricity or heat. In the case of a cell reaction, the reaction will not occur spontaneously unless an external source of electrical energy is provided.

Conclusion:

In conclusion, when the Gibbs free energy change for a cell reaction is positive, it indicates that the reaction is non-spontaneous and will not occur on its own. This means that an external source of energy is required for the reaction to proceed.