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35 Cards in this Set
- Front
- Back
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synthesis
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a chemical reaction in which 2 or more simple substances combine to form a new more complex sunstance
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compound
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a substance made of two or more elements chemically combined in a specific ratio or proportion
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family
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elemnents in the same vertical column of the periodic table. ALso called a group.
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noble gases
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elemnts which belong in group 18 and are also called inert. they are in active because they have the maximum number of valnce electrons
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chemistry
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the study of the properties of matter and how matter changes
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mixture
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2 or more substances that are mixed together, but not cheically combined
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conservation of mass
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The priciple stating that matter is not created or destroyed during a chemical reaction
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chemical change
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A change in matter that produces a new substance
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atom
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the smallest particle of an element
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coefficient
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a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
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replacement
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a reaction in which one element replaces another in a compound or when two elemts in different compounds trade places.
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chemical equatiion
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a short easy way to show a chemical reaction using symbols instead of words
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subscript
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a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
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group
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elements in the same verticle column of the periodic table. Also called family
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Valence Electron
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The electrons that are farthest away from the nucleus of an atom and are involved in chemical reactions.
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proton
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small positively charges particles that are found in the nucleus of an atom
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decomposition
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a chemical reaction that breaks down compounds into simpler products
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neutron
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small uncharges particles that are found in the nucleus of an atom
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electron dot diagram
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a representation of the number of valence electrons in an atom, using dots placed around the symbol of an element
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reactants
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the substance that enters into a chemical reaction
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chemical reaction
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the process in which substances undergo chemical changes that results in the formation of new substances
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molecule
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a particle made of two or more atoms bonded together
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symbol
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a one or two letter set of characters that is used to identify an element
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element
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a substance that cannot be broken down into any otehr substances by chemical or physical means
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solution
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a well -mixed mixture
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chemical formula
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a combination of symbols that represent the elemnts in a compound
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products
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a substances formed as a result of a chemical reaction
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chemical bond
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a force that holds atoms together
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precipitate
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a solid that forms from a solution during a chemical reaction
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physical change
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a change that alters the form or appearance of a material but does not make the material into another substance
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nucleus
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the central core of the atom, containing protons and usually neutrons
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electrons
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tiny negatively charges, high energy particles that move around outside the nucleus of an atom
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atomic number
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the number of protons in the nucleus of an atom
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period
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elemnts in the same horizontal row of the periodic table
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halogen
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an elemnt belonging to Group 17 of the periodic table
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