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Matter
Anything that has mass and takes up space.
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Atom
The basic unit of matter.
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Element
A pure substance made of only one kind of atom.
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Molecule
A group of atoms chemically bonded together.
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Compound
A substance made up of atoms of two or more different elements joined by chemical bonds.
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Substance
A single kind of matter that is pure and has a specific set of properties.
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Physical Property
A characteristic of a pure substance that can be observed without changing it into another substance.
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Chemical Property
A characteristic of a pure substance that describes its ability to change into different substances.
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Chemical Bond
An attractive force that holds together the atoms, ions, or groups of atoms in a molecule or compound.
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Mixture
A combination of two or more substances that are not chemically combined.
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Heterogeneous Mixtures
A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture.
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Homogeneous Mixtures
A mixture in which the composition is uniform throughout.
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Solution
A mixture where you cannot see the separate parts of the mixture (ex: air, sugar water, salt water) and is all one phase.
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Solid
State/phase of matter that has definite shape and volume, and the particles are locked in place and can only vibrate.
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Liquid
- State/phase of matter that has definite
- volume, but no shape. The particles are close together, but can move
- past each other (i.e. flow).
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Gas
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State/phase of matter that has no definite volume or shape. The particles can move freely and collide with each other
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Physical Change
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A change of matter from one form to another without a change in chemical properties
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Chemical Change
A change that occurs when one or more substances change into entirely new substances with different properties.
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Law of Conservation of Matter
Matter is not created nor destroyed in any chemical or physical change.
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A measure of the average energy of motion of the particles of a substance.
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Thermal Energy
The energy of motion in the molecules of a substance.
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