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18 Cards in this Set
- Front
- Back
a substance made of two or more elements that are chemically bound together in a set ratio
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compound
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consists of two or more substances in the same place that are not chemically combined
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mixture
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alters the form or appearance of a material but does not convert the material into new substances
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physical change
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a change in matter that forms one or more new substances
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chemical change
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a material that can be pounded into shapes
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malleable
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a substance that cannot be broken down into any other substances by chemical or physical means
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element
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a short simple way to describe a chemical reaction, using symbols and formulas instead of words
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chemical equation
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what are the parts of a chemical equation
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reactants: the substances you start with in a chemical reaction
products: the substances you end with |
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the force that holds 2 atoms together
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chemical bond
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a combination of 2 or more atoms that are bonded together
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molecules
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the number of protons in the nucleus of an element's atoms. it identifies an element
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atomic number
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an element in group 2 of the periodic table. not as reactive as the metals in Group 1, these elements are more reactive than most metals. never found uncombined in nature. ex. magnesium & calcium
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alkaline earth metals
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the elements found in group 3 through 12
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transition metals
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have some characteristics of metals and some of nonmetals
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metalloids
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what did Mendeleev discover about similar elements by studying chemical and physical properties
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that he could arrange elements in a chart, or table, based on their physical and chemical properties
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what did Mendeleev predict about unknown elements based on the position of the blanks he left
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he predicted the properties of the unknown elements, based on where the blanks fell in the table
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Ex. of physical properties
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density, color, hardness, melting point, boiling point
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Ex. of chemical properties
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burns, tarnishes, rusts
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