An increase in the temperature of a liquid causes a(n)?
a - increase in the kinetic energy of the particles
b - endothermic reaction to occur
c - decrease in the velocity of the particles
d - exothermic phase change to occur

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.