why a solution of perchloric acid in water is a good conductor of electricity while distilled water and perchloric acid separately do not conduct electricity

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They cool it down and aluminum cools easily

The answer is c. risk

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.