Ibuprofen, a well-known non-steroidal anti-inflammatory drug, has chirality. only the s enantiomer has anti-inflammatory activity (although the r enantiomer is converted slowly by the body into the s enantiomer). add wedge-and-dash bonds to complete the perspective structures of the two stereoisomers of ibuprofen.

c, liquids evaporate, creating a gas

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.