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Has a definite shape and definite volume, particles in a fixed position


Has an indefinite shape and definite volume, particles slide past one another


Has an indefinite shape and an indefinite volume, particles spread apart

3 States of Matter

Solid, Liquid, and Gas


Two or more substances that are mixed together, but not chemically combined


Best Mixture

Pure Substance

Only one kind of matter


The smallest particle of an element with the properties of that element


A substance in which all atoms are alike, which cannot be chemically or physically separated


Made of two or more elements that are chemically combined

Chemical Bond

The force that holds atoms together

Physical Change

A change that alters the form or appearance of a substance, but does not make the materials in to another substance

Chemical Change

A change that creates a new substance


Change from solid to liquid, heat/energy added


Vaporization that occurs on and below the surface of a liquid, heat/energy added


Liquid to gas, heat/energy added


Change from Solid to Gas, heat/energy added


Change from liquid to solid, heat/energy taken away


Change from gas to liquid, heat/energy taken away

Characteristic Properties

A quality of a substance that never changes and can be used to identify the substance

Chemical Formula

A combination of symbols that represent the elements in a compound

5 Signs of a Chemical Reaction

Change of color, change in temperature, precipitation, production of gas, change in properties (odor, light)

Crystalline Solid

A substance made of crystals in which the particles are arranged in regular repeating patterns

Amorphous Solid

A solid made up of particles that are not arranged in a regular pattern


The resistance of a liquid to flowing


The measure of the average energy of the motion of particles in a substance


Force exerted on a surface, divided by the total area over which the force is exerted.


Vaporization that occurs at the surface of a liquid


Particle consisting of two or more atoms


Building blocks of all matter, smallest particle of an element that still retains properties of that element

Parts of an Atom

Protons, Neutrons, Electrons


Particles with a positive charge


Particles with no charge


Particles with a negative charge

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