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Science- Chemical Compounds Etc.
vocabulary 5-26-11
20
Science
9th Grade
05/26/2011

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Term
compound
Definition
substance made up of 2 or more elements, chemically combined.
Term
molecule
Definition
smallest part of a substance that has all the properties of the substance.
Term
substance
Definition
any element or compound.
Term
mixture
Definition
2 or more substances that have been mixed together but NOT chemically combined.
Term
Crystal Lattice
Definition
ions arranged in a regular pattern.
Term
ion
Definition
an atom with an electrical charge
Term
ionic bond
Definition
bond formed between atoms that have gained and lost electrons.
Term
covalent bond
Definition
bond formed when atoms share electrons.
Term
chemical bond
Definition
way of writing the name of a compound using chemical symbols.
Term
subscript
Definition
number written to the lower right of a chemical symbol.
Term
oxidation number
Definition
number of electrons an atoms gains, loses, or shares when it forms a chemical bond.
Term
valence electrons
Definition
electrons in an atom's outer energy level
Term
chemical reaction
Definition
process in which new substances with new chemically and physical properties are formed.
Term
product
Definition
substance that is formed in a chemical reaction
Term
reactant
Definition
substance that is changed in a chemical reaction
Term
chemical equation
Definition
statement in which chemical formulas are used to describe a chemical reaction
Term
coefficient 
Definition
# that shows how many molecules of a substance are involved in a chemical reaction.
Term
oxidation
Definition
chem. reaction in which electrons are lost.
Term
reduction
Definition
chemical reaction in which electrons are gained
Term
synthesis reaction
Definition
reaction in which substances combine to form a more complex substance.
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