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21 Cards in this Set
- Front
- Back
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physical change
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The change in the size, shape, or state of a material.
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chemical change
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Any change in which one or more new substances are formed.
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model
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a way to represent an object or to describe how a process takes place.
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nucleus
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mass of an atom contained in a dense, central core. It contains protons and neutrons.
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proton
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a particle with a positve electic charge.
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neutron
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a particle with no electric charge.
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electron
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a particle with a negative electric charge.
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atomic number
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an element is the number of protons in an atom of that element.
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ion
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an electrically charged atom
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radioactive element
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an element made up of atoms whose nuclei ( plural for nucleus) breaks down, or decays, into nuclei of other atoms.
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nuclear fission
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The reaction of splitting of the nuclei of some atoms by bombarding them with neutrons.
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acid
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a compound that turns blue litmus paper red.
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indicator
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a substance that changes color when mixed with an acid or a base.
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base
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a compound that turns red litmus paper blue
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neutralization
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The reaction between an acid and a base.
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salt
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a compound that can be formed when an acid reacts with a base.
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polymer
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an organic compound made up mainly of a very long chain or chains of carbon compounds.
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synthesis
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Putting together. ex. hydrogen gas and oxygen gas combine to produce water.
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Decomposition
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involves the breaking down of a substance into simpler substances.
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single replacement
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reaction in which one of the elements in a compound is replaced by another element.
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Double replacement
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reaction where elements from two different compounds change places.
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