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physical property

characteristic that you can observe without changing the composition of the substance

chemical property

characteristic that cannot be observed without altering
the substance

physical change

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


liquid changed into a gas


gas changed into a liquuid


solid changes directly into a gas


gas changes into a solid

chemical change

substances are changed into different substances; the composition of the substance changes

law of conservation of mass

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

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