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physical property

a quality or condition of a substance that can be observed or measured without changing the substance's composition

chemical property

a characteristic that cannot be observed without altering the substance

physical change

one in which the form or appearance of matter changes, but not its composition


The change of state from a liquid to a gas


The change of state from a gas to a liquid


(chemistry) a change directly from the solid to the gaseous state without becoming liquid


change of state from a gas directly to a solid

chemical change

a change that produces matter with a different composition than the original matter

law of conservation of mass

the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes


a solid that separates out of a solution during a chemical change


a process in which substances mix evenly with one another


The makeup of a material. A material formed from two or more substances.

Antoine Lavoisier

Often known as the father of Chemistry. He proposed the Law of Conservation of mass and discovered some gasses.

examples of chemical changes

Cooking, body process, bubbling, souring, rusting, rotting, evolution of light & heat, production of gas, formation of precipitate (insoluble solid), and odor changes

examples of physical changes

1. sawing wood, 2. shedding paper, 3. melting wax, 4.grating a potato, 5. hammering copper, 6. carving gemstones, breaking, dissolving, freezing, melting, evaporating, condensing, shaping, cutting,

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