Why a high temperature is needed to get a high yield

If the temperature is increased, the equilibrium position moves in the direction of the endothermic reaction. This means it moves to the left in the Haber process. You might think that a low temperature is chosen, moving the equilibrium position to the right and making more ammonia.

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

it is called acid bonding