The solutions that are used in this experiment have alcohols as both the solvent and the reactant. the excess
alcohol is removed by (circle the letter):
a. simple distillation.
b. vacuum filtration.
c. liquid-liquid extraction.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation:

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

gravitational energy

electrical energy

kinetic energy

ligh energy