• Changes of matter are chemical - change the nature of c.p's (= appearance also) - if they look similar only for some substances. (60 yrs, acid rain) sculpting weather causes: is P pitting specific to marble (CaCO3) > is marble! - weather causes: machining rusting is L iron (Fe) specific → is C to iron! Air is disinfected with UV Ilight: Stalagmites grow: Cooking pan is preheated: Jeans are worn out to holes:_ Bamboo grows: Cooking pan is degreased with soap: Jeans are bleached to white: Air is humidified: C/P? → Chemical changes reactions often make/change: color, odor, taste, light, gas, heat, precipitate...

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