When elements bond together or when bonds of compounds are broken and form a new substance A. Fireworks
B. Chemical Reaction
C. Chemical Change

D. Energy

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.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

An observation that requires measurement is called quantitative observable or qualitative