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17 Cards in this Set
- Front
- Back
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chemical properties
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properties of a substance that describe how it changes while being converted into a substance
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chemical change
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when two or more substances unite to break apart chemicaly
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element
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the simplest type of substance
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atoms
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the smallest particles of matter
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an element cannot be broken down to anything smaller than...
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one particular kind of atom
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compound
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a new substance formed from the chemical union of two or more elements
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chemical reaction
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the process of forming a chemical bond
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nucleus
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the core of an atom that contains protons and neutron
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proton
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has a positive charge
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atomic number
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the number of protons found in the nucleus of a particular atom
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electrons
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have negative electric charges
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neutrons
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have no electric charge
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scientific notation
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using exponents to write out extremely large or small numbers
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atomic mass of an element
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is approximately equal to the sum of the number of protons and neutrons found in the nucleus of an average atom of that element
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stable atom
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has an equal number of electrons and protons
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molecule
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two or more atoms that are chemically united
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chemical symbol
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used to identify elements
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