List four possible clues to a chemical change

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

When a scientific theory has been tested and proved by the scientific community, it becomes a law