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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
consists of two or more substances in the same place that are not chemically combined
alters the form or appearance of a material but does not convert the material into new substances
physical change
a change in matter that forms one or more new substances
chemical change
a material that can be pounded into shapes
a substance that cannot be broken down into any other substances by chemical or physical means
a short simple way to describe a chemical reaction, using symbols and formulas instead of words
chemical equation
what are the parts of a chemical equation
reactants: the substances you start with in a chemical reaction
products: the substances you end with
the force that holds 2 atoms together
chemical bond
a combination of 2 or more atoms that are bonded together
the number of protons in the nucleus of an element's atoms. it identifies an element
atomic number
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
alkaline earth metals
the elements found in group 3 through 12
transition metals
have some characteristics of metals and some of nonmetals
what did Mendeleev discover about similar elements by studying chemical and physical properties
that he could arrange elements in a chart, or table, based on their physical and chemical properties
what did Mendeleev predict about unknown elements based on the position of the blanks he left
he predicted the properties of the unknown elements, based on where the blanks fell in the table
Ex. of physical properties
density, color, hardness, melting point, boiling point
Ex. of chemical properties
burns, tarnishes, rusts