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Unit Three
key words
17
Science
8th Grade
10/10/2014

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Term
ovalent bond
Definition
a bond in which electrons are shared between the bonded atoms
Term
ionic bond
Definition
the force of attraction between a charged atom (or group of connected atoms) and another with the opposite charge
Term
valence electron
Definition
the electrons in the outermost shell of an atom
Term
combustion reaction
Definition
an exothermic reaction in which oxides are usually formed
Term
decomposition reaction
Definition
a kind of chemical reaction in which a single compound is broken down into two or more simpler compounds
Term
endothermic reaction
Definition
a chemical reaction in which energy is absorbed from its surroundings
Term
precipitate
Definition
A solid that forms as a result of a chemical reaction. A white solid precipitate may form when aluminum chloride is added to a substance that contains aluminum
Term
products
Definition
the molecules that result from a chemical reaction
Term
reactants
Definition
he starting molecules in a chemical reaction
Term
covalent bond
Definition
a bond in which electrons are shared between the bonded atoms
Term
covalent compound
Definition
any compound resulting from covalent bonding
Term
ionic bond
Definition
the force of attraction between a charged atom (or group of connected atoms) and another with the opposite charge
Term
ionic compound
Definition
any compound resulting from ionic bonding
Term
polymer
Definition
a molecule consisting of repeating chemical units
Term
catalyst
Definition
a substance present during a chemical reaction that speeds up the reaction but is not used up or changed during the reaction
Term
equilibrium
Definition
that state of chemical system in which the rates of the forward and reverse reactions are equal
Term
reaction rate
Definition
how quickly a specific chemical reaction occurs under specific conditions over time
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