Chemical and physical properties are used to identify substances. a substance's chemical properties identify whether or not that substance reacts with another substance. what chemical property is present in substances that react slowly to oxygen?

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.