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Chapter 3 Vocab
Words for science
28
Biology
9th Grade
02/01/2013

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Term
Atom
Definition
The smallest unit of matter that can not be broken down by chemical means.
Term
element
Definition
A substance made up of atoms with the same number of protons.
Term
Valence electrons
Definition
Electrons on the outermost level, or shell.
Term
Compound
Definition
A substance made up of bonded atoms with two or more different elements.
Term
Molecule
Definition
A group of atoms held on together by covalent bonds.
Term
Ion
Definition
An atom or a group of atoms that have an electric charge.
Term
Cohesion
Definition
Attraction of particles of the same substance.
Term
Adhesion
Definition
Attraction of particles of different substances.
Term
Solution
Definition
A mixture in which ions and molecules of one or more substances that are evenly distributed.
Term
Acids
Definition
Compounds that form extra hydronium ions dissolved with water.
Term
Bases
Definition
Compounds that form extra hydroxide ions when dissolves in water.
Term
pH
Definition
A measure of how acid and or basic solution is.
Term
Buffer
Definition
A reaction to prevent pH changes.
Term
Carbohydrates
Definition
Molecules made of sugar.
Term
Lipids
Definition
Another class of bio molecules, which includes fats, steroids, etc.
Term
Protien
Definition
A molecule.
Term
Amino Acids
Definition
Building blocks that form to build proteins.
Term
Nucleic Acids
Definition
A long Chain of nucleotide units.
Term
Nucleotide
Definition
A molecule made up of three parts, sugar base, and phosphate.
Term
DNA
Definition
Contain the sugar deoxyribose.
Term
RNA
Definition
Contain the sugar Ribose.
Term
Energy
Definition
The ability to move or change matter.
Term
Product
Definition
A new substance that is formed.
Term
Reactent
Definition
A substance that is changed by a chemical reaction.
Term
Activation energy
Definition
Reaction that is the minimum kinetic energy.
Term
Enzyme
Definition
A molecule that increases speed of biochemical reactions.
Term
Active site
Definition
Region where reaction takes place.
Term
Substrates
Definition
Shape of a active site.
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