Question: A certain reaction A + B C + D has one reactant, B, that has a characteristic color. When the system at equilibrium is

A certain reaction A + B ⇆ C + D has one reactant, B, that has a characteristic color. When the system at equilibrium is heated up, the B color diminishes. a) What does that tell us about the direction of the shift in equilibrium? b) Is the reaction endothermic or exothermic?

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