True: At dynamic equilibrium, the forward and backward reactions happen at the same time, An exothermic reaction releases thermal reactions to the surroundings, A closed system is one in which no chemicals can enter or leave, At equilibrium the forward and backward reaction happen at the same rate, At equilibrium, the concentration of the reaction mixture stays the same, If the forward reaction is exothermic then the reverse is endothermic, The forward reaction is endothermic 2A + B ⇌ C + D. An increase in temperature will cause equilibrium to shift right , 2A + B ⇌ C + D. An increase in pressure will increase the yield of C+D, Kc is affected by temperature, Kc greater than one means equilibrium lies to the right, Mol dm-3 are the units for concentration, Exothermic reactions have a negative enthalpy change, A homogeneous reaction is one in which reactants and products are all in the same state, False: The forward reaction is the reaction to the left, Endothermic reactions have a negative energy change, An open system is needed to reach dynamic equilibrium, At equilibrium, no reaction happens, The reaction mixture always has 50% reactants and 50% products, This is a reaction profile for an endothermic reaction, 2A + B ⇌ C + D. Removing A and B will increase the yield of C and D, A catalyst affects the position of equilibrium, Kc is affected by pressure, Kc of 0 means equilibrium lies in the centre, Kc always has units, High pressures are inexpensive to achieve and maintain, The Haber process uses an endothermic reaction to produce ammonia,

Dynamic equilibrium and Kc

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