a)write the equilibrium reaction taking place in the sealed test tube: b) which direction did the equilibrium in (a) shift when added to hot water? which direction did the equilibrium in (a) shift when added to cold water? c) based on your observations, is reaction (a) endothermic or exothermic? (hint try writing in heat as a product or reactant and see which fits) describe how the observed shift in a) relieves the stress (heat) applied to equilibrium (a).