[06.04]on a potential energy diagram, the activation energy is greatest under which of the following conditions? the potential energy of the products is greater than that of the reactants and the change in enthalpy is positive.  the potential energy of the products is less than that of the reactants and the change in enthalpy is positive.  the potential energy of the products is greater than that of the reactants and the change in enthalpy is negative.  the potential energy of the products is less than that of the reactants and the change in enthalpy is negative.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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