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20 Cards in this Set
- Front
- Back
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A specific area in an atom at a definite distance from the nucleus, where electrons are most likely to be found.
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Energy level (shell)
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The electrons in the outermost energy level of an atom.
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Valence electrons
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The sum of the charges within an atom. In a neutral atom, the charge is 0.
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Electric charge
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It is made of only one kind of atom.
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Element
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A substance made of two or more elements that are chemically combined.
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Compound
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Two or more bonded atoms.
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Molecule
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Mixtures are not chemically combined; they maybe separated by physical means.
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Mixture
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A property of a substance that can be observed without changing the identity of the matter. Examples are mass, volume, density, color.
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Physical property
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A property of a substance that is based on its ability to react with another substance. Examples burning, rusting.
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Chemical property
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A change in matter that does not result in a new or different substance.
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Physical reaction (change)
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A change that takes place when two or more substances interact to form new substances. The new substance have different properties than the original substances.
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Chemical reactions (change)
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A description that uses numbers and element symbols to represent the atoms and the numbers of atoms that make up a compound.
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Chemical formula
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A one or two letter abbreviation for the name of an element.
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Symbol
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A way of representing chemical reactions; the re-arrangement of atoms using chemical symbols and numbers.
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Chemical equation
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A chemical equation in which the number of atoms of each substance are equal for both the products and the reactants.
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Balanced equation
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What is formed from a chemical reaction. The elements & compounds to the right of the arrow.
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Product
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A starting material in a chemical reaction. Elements & compounds to the left of the arrow.
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Reactant
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A chemical reaction that results in energy being absorbed.
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Endothermic
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A chemical reaction that results in energy being given off.
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Exothermic
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States that mass is neither created nor destroyed in an ordinary chemical reaction, it only changes forms.
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Law of Conservation of Mass (Matter)
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