Which of the following statements about buffers are TRUE? Buffers are always written from the perspective of the acid component of the buffer. Buffers can only be created using conjugate acid/base pairs. When calculating buffer pH, the base dissociation constant (Kb) should be used . The Hendersen-Hasselbalch equation is used to calculate the pH of a buffer. Buffers are designed to prevent the pH of a solution from changing.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b