Properties of matter WS

An experimental procedure requires a 10 ml of acid to be dissolved

Light waves can move through , but they travel fastest when they move through a(n) .

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.