What is the total number of neutrons and protons in one atom of Iron-56?
If the atomic mass for Iron-56 is 56, then there must be a total of 56 protons and neutrons in the nucleus. By definition, the atomic mass of a particular atom (as opposed to the atomic weight or average atomic mass of all iron atoms) is the sum of the number of protons and neutrons in that atom. 18. What are a chemical change and a physical change? Give an example of each. A chemical change occurs when two or more substances bond together and form a completely new substance. An example is burning wood. A physical change only changes the size or shape of the substance, but does not result in a different substance. A example would be chopping wood into smaller pieces. 19. In looking at a chemical equation, how can you tell if a new substance is actually formed? When an actual chemical reaction takes place, the atoms are arranged in different combinations, that is, the molecules on the reactant side are different than the molecules on the product side, even though there are the same numb
