Referring to the attached picture,transitions 1, 2 and 4arechemical changes, whereastransitions 3 and 5arephysical changes.Physical changesare those in which theidentityof thesubstanceisnot modified, whereas inchemical changes,chemical reactionsproducenew substances.Let's consider theattached imagein which we havetwo elements:Blue (B)andRed (R).Intransition 1, the followingreactionis verified.B₂ + R₂ ⇒ BR + B₂Anew substance (BR)has been formed, so this is achemical change.Intransition 2, the followingreactionis verified.BR + B₂ ⇒ B₂RAnew substance (B₂R)has been formed, so this is achemical change.Intransition 3,BR and B₂ are separatedfrom each other. But the moleculesremain the same. Thus, this is aphysical change.Intransition 4, the followingreactionis verified.B₂ ⇒ 2 BAnew substance (B)has been formed, so this is achemical change.Intransition 5, molecules arecloserbut theiridentity doesn´t change. Thus, this is aphysical change.Referring to the attached picture,transitions 1, 2 and 4arechemical changes, whereastransitions 3 and 5arephysical changes.You can learn more aboutphysical and chemical changeshere:brainly.com/question/13620149...

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