CEM 141 - Exam 2 Questions With 100% Correct Answers.

mole - 6.022 x 10^23 things number of particles that allows us to convert from the molecular to the macroscopic level limiting reactant/reagent - amount of one of the reactants which limits how much product can be formed. smallest amount. percent yield - actual/theoretical x 100 electromagnetic radiation - wavelength - The distance between two corresponding parts of a wave. seconds/wave. 1/frequency. measured in m amplitude - Height of a wave frequency - waves/second. 1/wavelength. measured in Hz Constant (c) - 3 x 10^8 m/s. c=(wavelength)(frequency) constructive interference - The interference that occurs when two waves combine to make a wave with a larger amplitude = brighter destructive interference -The interference that occurs when two waves combine to make a wave with a smaller amplitude = darker diffraction - The bending of a wave as it moves around an obstacle or passes through a narrow openingmodels of light - light as a wave/particle photoelectric effect - The emission of electrons from a metal when light shines on the metal. why is light considered a wave (evidence) - diffraction, interference why we consider light a wave (claim, evidence, reasoning) - claim-light is a wave evidence- diffraction, interference reasoning- light acts the same as waves as demonstrated in diffraction and interference. why is light considered a particle - photoelectric effect. there is a threshold frequency below which no electrons are emitted from metal when light is shined . if light were a wave, the intensity should increase the energy and eject electrons.