A physical change is when the atoms combine to create a new product. >True
>False

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin

The sum of the oxidation numbers in a neutral compound is always