The molecular formula for caffeine is c8h10n4o2. which of the following elements is not found in caffeine? carbon helium nitrogen oxygen

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.

  the mississippians were considered to be  horticulturalists, which means they were