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anything that has mass and occupies space.


the study of the properties of matter and how matter changes


A single kind of matter that is pure and has a specific set of properties

physical property

a characteristic that can be observed or measured without changing the identity of the substance

chemical property

relates to a substance's ability to undergo changes that transform it into different substances


any substance that cannot be broken down into simpler substances


smallest particle of an element

chemical bond

the force that holds two atoms together


a combination of two or more atoms


two or more elements that are chemically combined

chemical formula

a formula that gives the elements in a compound and the ratio of atoms


A combination of two or more substances that are not chemically combined

heterogeneous mixture

a mixture in which pure substances are unevenly distributed throughout the mixture

homeogeneous mixture

a mixture in which substances are evenly distributed throughout.


a homogeneous mixture of two or more substances

physical change

a change in a substance that does not involve a change in the identity of the substance

chemical change

a change that occurs when one or more substances change into entirely new substances with different properties

Law of conservation of Mass

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


the ability to do work

endothermic change

a change in which energy is taken in

exothermic change

a change in which energy is given off

thermal energy

the total kinetic and potential energy of all the particles in a substance.

chemical energy

potential energy stored in chemical bonds of molecules.

electromagnetic energy

A form of energy that travels through space as waves

electrical energy

the energy of electrically charged particles moving from one place to another


A metal strip that conducts electricity

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