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35 Cards in this Set

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