A magnesium atom that loses 2 electrons becomes a A) Positive ion with a smaller radius

B) Positive ion with a larger radius

C) Negative ion with a larger radius

D) Negative ion with a smaller radius

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?