The boiling point of a pure substance is defined as the temperature at which:
a) the kinetic energy of the molecules begins to increase
b) the vapor pressure equals the external pressure
c) the molecules of the substance break apart
d) the liquid phase can be completely evaporated
in advance

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?