Aire contains 78 percent nitrogen 21 percent oxygen and one percent argon which gas is the solvent
oxygen
nitrogen
argon
none of the above

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

At element makes up all organic compounds?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules