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Chapter 5 - The Structure of Matter
Definitions
15
Science
9th Grade
11/13/2010

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Term
Chemical Bond
Definition
The attractive forces that holds atoms or ions together.
Term
Chemical Structure
Definition
The arrangement of atoms in a substance.
Term
Bond Length
Definition
The average distance between the nuclei of two bonded atoms.
Term
Bond Angle
Definition
The angle formed by two bonds to the same atom.
Term
Ionic Bond
Definition
A bond formed by the attraction between oppositely charged ions.
Term
Metallic Bond
Definition
A bond formed by the attraction between positively charged metal ions and the electrons around them.
Term
Covalent Bond
Definition
A bond formed when atoms share one or more pairs of electrons.
Term
Polyatomic Ion
Definition
An ion made of two or more atoms.
Term
Empirical Formula
Definition
The composition of a compound in terms of the relative numbers and kinds of atoms in the simplest ratio.
Term
Molecular Formula
Definition
A chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of atoms.
Term
Organic Compound
Definition
A covalently bonded compound that contains carbon, excluding carbonates and oxides.
Term
Polymer
Definition
A large molecule that is formed by more than five monomers, or small units.
Term
Carbohydrate
Definition
Any organic compound that is made of carbon, hydrogen, and oxygen and that provides nutrients to the cells of living things.
Term
Protein
Definition
An organic compound that is made of one or more chains of amino acids and that is a principal component of all cells.
Term
Amino Acid
Definition
Any one of 20 different organic molecules that contain a carboxyl and an amino group and that combine to form proteins.
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