Kelly is walking on the beach when she finds an interesting rock. She picks it up, examines it, and wonders what type of rock it is and how the rock was formed. What type of rock did Kelly find, and how you can tell? Describe how this type of rock is formed.

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.