The following reaction is endothermic:
C a C O_{3}(s)\rightleftharpoons C a O(s)+C O_{2}(g)What is the effect of increasing the temperature of the reaction mixture? Decreasing the temperature?
Because the reaction is endothermic, we can think of heat as a reactant.
Heat + C a C O_{3}(s)\rightleftharpoons C a O(s)+C O_{2}(g)
Raising the temperature is adding heat, causing the reaction to shift to the right. Lowering the temperature is removing heat, causing the reaction to shift to the left.