What kind of chemical change do you think occurs when a banana peel turns brown in the open air?

Compare and contrast physical changes with chemical changes.

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

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