Reactants and products

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

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

Who discovered a pattern to the elements in 1869?