What does a chemical formula like Na2CO3 tells us?

Which atom or ion is the largest? 0 a. 0 0 0 0 e. li

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Compare and contrast physical changes with chemical changes.