Chemical: Rusting of iron (bicycle in the rain), curdling milk (milk not being put back in the fridge), butter melting (making popcorn), digestion of food (after dinner), and newspapers turning yellow after being left in the sun (your grandfather comes over to visit).
Physical: Ice melting (in a glass), water evaporation (stove top), mixing of alcohol and water, drying wet stuff (spilling juice and cleaning it up, getting out of the shower and drying yourself of.)