Chemistry 96 Summer 1998 Midterm Review Questions KEY 1. Give a clear example. A limiting reactant is the reactant which is consumed first in a chemical reaction. If one mole of methane is reacted, and less than two moles of oxygen are present, then all the oxygen will be consumed before all the methane is consumed. In this case, oxygen would be the limiting reactant.
Percent yield is a measure of the efficiency of a chemical reaction.
It is calculated by comparing the actual yield of product to the expected yield of product. Newtonian mechanics failed to provide an adequate explanation of what happened to the theoretical construct called a blackbody at high temperatures. It was known that natural objects would give off light when heated. The energy of the emitted light increased as the temperture increased, to a certain maximum temperature. Beyond that temperature, the energy of light decreases.