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We can tell when a chemical reaction occurs by looking at the result. If the matter changes identity rather than just form, then a (4) chemical change has occurred. When this happens (5) chemical bonds are broken and formed. If a substance’s size, shape, or form changes then a (6) physical change has occurred. This happens when a change in (7) state of matter has happened, and the substance changes between solid, liquid, and/or gas. This all falls under the study of matter and how substances interact with each other, or (8) chemistry.