Indicators change color vwhen an acid and a base are mixed together. The change in color most likely indicates that achemical change has occured a physical change has occured. a new acid has been produced. a new base has been produced

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth