If you could observe atoms and molecules with the naked eye, what would you look for as conclusive evidence of a chemical reaction?

Could someone me find the answer to this problem.

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?

If a star is moving toward earth, it is