Which of the following would be a good situation in which to apply hess's law? a. when the reaction is exothermicb. when the products are unknownc. when a reaction is spontaneousd. when the hreaction is not known

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?