Heat is an exchange of internal energy from one system to another due to a. a temperature difference between the systems. b. one system being gas and the other being solid. c. the systems having the same temperature. d. one system being liquid and the other being solid. this is ether physics or chemistry i don't know

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: