Chemical change: A match lights when struck, Bubbles form when baking soda is added to vinegar , Hydrogen sulfide gas (H2S) causes silver to tarnish , A test tube feels cold to the touch when baking soda and vinegar are combined, One or more NEW substances form , Chemical properties change , Composition of substances changes , Changes are mostly irreversible, Composting leaves into soli, Fireworks exposition , Rotting banana, Decomposing water into hydrogen and oxygen, bleaching hair, mending a broken bond, digesting food, Physical change: Wood is placed into a chipper , A lump of gold is pounded into a large, thin sheet , A pan of water boils on a stove , Changes are temporary , Substances retain their chemical properties, Composition of substances do not change , Changes are mostly reversible , Sugar dissolving in tea, fogging a mirror with your breath , frost depositing on a window , writing on paper, slicing potatoes for fries , Crushing rocks , liquid water turns into vapor, a cold drink "sweats" on a warm day,

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