The photograph shows a mixture of beach sand. A student wants to separate the shell bits, rocks, and sea animals
from the sand.
Which method is the best way for the student to separate the mixture?
A. Filtering
B. Magnetism
C. Evaporation
D. Settling

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

the ratio of the conjugate base to the acid required to attain the desired ph.

it takes on an electronical energy

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.