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In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

What produces wave a)sound b) heats c)transfer of energy d)vibrations