the radioisotope radon-222 has a half-life of 3.8 days. how much of a 73.9g sample of radon-222 would be left after approximately 23 days

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

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

Substance 33°f 100°f peanut oil solid liquid margarine solid liquid chocolate chips solid liquid which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.