Eisenhower uses the phrase in his farewell speech “insolvent phantom” as

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

What is the most common reason for matter changing its state?

How can parts of a solution be separated by chromatography?