How might the atomic numbers of elements indicate that newly discovered elements would have to have very high atomic numbers?

If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy