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Chapter 2: Chemistry of Life
Author of Text in Use: Stephen Nowicki
7
Biology
9th Grade
01/23/2013

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Term
acid
Definition
a compound that releases a proton – a hydrogen ion (H+) – when it dissolves in water
Term
activation energy
Definition
the amount of energy that needs to be absorbed for a chemical reaction to start
Term
adhesion
Definition
the attraction among molecules of different substances
Term
atom
Definition
the smallest basic unit of matter
Term
amino acid
Definition
a molecule that contains carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur; there are 20 different ones used to create proteins
Term
base
Definition
a compound that removes a proton – hydrogen ion (H+) – from a solution
Term
bond energy
Definition

the amount of energy that will break a bond between two atoms

 

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