How many atoms le aluminum are in this compound

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Which material burns faster? metal aluminum

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.