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which one of the following statements is true? A. an endothermic reaction is one in which...

which one of the following statements is true?
A. an endothermic reaction is one in which energy is released from the system into the surroundings
B. in an exothermic reaction the products are higher in energy than the reactants
C. The total amount of energy in the universe is not a constant
D. The change in enthalpy for exothermic chemical reactions is positive
E. when energy is released from the system it is absorbed by the surroundings
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