A 1.0 L buffer solution is 0.050 M HC2H3O2 and 0.250 M KC2H3O2. Which of the following actions will destroy the buffer? a) adding 0.050 moles of NaOH.
b) adding 0.050 moles of HCl .
c) adding 0.050 moles of HC2H3O2.
d) adding 0.050 moles of KC2H3O2.

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density