Which is a unique feature of mercury?
a.
it is the only planet with permanent liquid water on its surface.
b.
it is the smallest planet and has the shortest period of revolution around the sun.
c.
the thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and make the atmosphere very hot.
d.
the planet’s surface is covered with red, iron-oxide dust

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

What was bohr’s contribution to the planetary model

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.