The buildings in this old mine are made of metal. you can see over 100 years, the silver color of the buildings has changed. the red-brown color is rust. what does this color change tell us about the metal? a) the metal is malleable. b) the metal reacts in the presence of air and water. c) acid rain has damaged the building over the years. d) the metal is a good conductor of heat and electricity.

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).

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