Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

1 - Equilibrium determines the rate of reactants and products at the same time.

General expression for equilibrium:

Reactants⇌ Products

2 - At equilibrium, all the reactants and products are constant.

3 - At equilibrium forward and reverse reaction does not stop, in fact, it continues at all times.

4 - When the concentrations of reactants and products become equal dynamic equilibrium is obtained.

For example:

A + B ⇌ C + D

In this reaction, if the concentration of reactant A has increased the equilibrium will shift to the right to form more products.

If the concentration of reactant A has decreased the equilibrium will shift to the left in the backward direction to form reactants.

Answer:At equilibrium, the forward and backward reaction rate is the same.

Explanation:The equilibrium counteracts any change in the condition of the reactant or product. The le'chatalier principle highlights three main factors that affect the state of equilibrium. The three factors are: amount of moles, concentration and pressure. If the amount of reactant is increased, the equilibrium will shift to the right in order to create a balance between the forward and backward reaction and vice versa.