What Are Chemical Changes in Matter?

Physical properties vs. Chemical properties yellow, thin, has six sides, etc. burns in the presence of oxygen at about 660˚F

physical property A trait of a substance not involving an interaction with another substance.

Water made up of hydrogen and oxygen colorless, odorless, boils at 100˚C, melts at 0˚C made up of hydrogen and oxygen Physical Chemical

Sulfur reacts with oxygen to form sulfur dioxide dull, brittle, yellow Chemical Physical

Remember boiling isn’t always hot & freezing isn’t always cold. Oxygen boils at -180˚C (very cold) Wax freezes at 45˚C (113˚F)

Chemical change: a change that results in one or more new substances. 1886: copper today: copper carbonate

compound A substance made of two or more elements that have chemically combined.

Law of Conservation of Mass: matter cannot be created or destroyed (only changed). Antoine Lavoisier vinegar + baking soda = gas