Use CER format and label each part. Support your answers to question 15 and 16 with evidence. As part of your evidence include the number and types of the specific molecules before and after cooling as well as evidence of a chemical change. (Pls help xnnsx)

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.