I need assistance. Calling all chemistry people I need someone to explain to me how I would determine the percent yield of magnesium oxide from the given reaction to determine if it is a useful commercial process

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation

Which statement would indicate the presence of an acid

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)