all of these elements were known by ancient civilizations except. A. Carbon B. Gold C. Iodine D. Sulfur​

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

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

Wind and moving water provide energy. chemical mechanical thermal none of the above