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cross words puzzle

Author: joey
Across
Electrons becomes an ____ and carries an electric charge.
A _____ is a substance that lowers the activation energy needed to start a chemical reaction.
A ______ is a pure substance formed when two or more different elements combine.
A ______ is a compound in witch the atoms are held together by covalent bonds.
When dissolved in water are called ______.
A ____ is the substance that is dissolved in the solvent.
____ are molecules made mostly of carbon and hydrogen.
The ______ is a supporting network of long, thin protein fibers.
Down
The _____ is one of the fundamental ideas of modern cell theory.
Of concentration of h+ in a solution is called ____.
Special proteins called____ are the biological catalysts that speed up the rate.
Different numbers of neutrons are called ______.
An _____ is an electrical attraction between two oppositely charged.
A _____ is a compound made of small carbon compounds.
Hydrogen ions when dissolved in water are called _____.