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Bio Vocab
4.3 Key Vocab
11
Biology
10th Grade
01/05/2012

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Term
Molecule
Definition
• Two or more atoms held together
by covalent bonds
Term
Ion
Definition
• An atom or group of atoms that
has become electrically charged
as a result of gaining or losing an
electron(s).
– Charge may be positive (if electrons
have been lost) or negative (if electrons
have been gained)
Term
Ionic Bond
Definition
• A chemical bond that occurs
when an atom transfers an
electron to another atom.
– Atoms are held together by the
attraction of opposite electrical charges
Term
Covalent Bond
Definition
• A chemical bond that forms when
two atoms share electrons
Term
Chemical Reaction
Definition
• Breaking of old and formation of
new chemical bonds that result in
new substances
Term
Reactant
Definition
• A compound or atom that is
involved in a chemical reaction
Term
Product
Definition
• New material created as a result
of a chemical reaction
Term
Synthesis Reaction
Definition
• A chemical reaction in which two
different elements are bonded
together forming a compound.
• A + B = AB
Term
Decomposition Reaction
Definition
• A chemical reaction in which a
compound is broken down into its
elements.
• AB = A + B
–The opposite of synthesis reaction
Term
Single Displacement Reaction
Definition
• A chemical reaction between an
element and a compound which
yields a different element and
compound.
• C + AB AC +
Term
Double Displacement Reaction
Definition
• A chemical reaction between two
compounds that yields two
different compounds.
• AB + CD CA + B
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