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AHSGE Science
II-4 Identify physical and chemical changes
16
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Not Applicable
09/26/2007

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Term
the process by which one or more new substances is formed by the rearranging of atoms and chemical bonds
Definition
chemical change
Term
the process of changing a substance from a liquid to a gas and then allowing it to become a liquid again for the purpose of purifying the substance
Definition
distillation
Term
evaporation of a substance directly from a solid to a gas without becoming a liquid
Definition
sublimination
Term
temperature at which a gas becomes a liquid
Definition
condensation point
Term
the energy stored within atoms and molecules that can be released when a substance takes place in a chemical reaction
Definition
chemical energy
Term
anaerobic pathway of cellular respiration that dows not use oxygen and converts pyruvate to either lactic acid or ethyl alcohol and carbon dioxide
Definition
fermentation
Term
a mixture of two or more pure substances that are uniformly mixed such that an observer cannot distinguish one substance from another
Definition
homogeneous
Term
the substance that dissolves another substance
Definition
solvent
Term
a homogeneous mixture of two substances that can be a solid, liquid, or gas
Definition
solution
Term
the substance that is dissovled in another substance
Definition
solute
Term
substance that is made up of more than one kind of atom
Definition
compound
Term
a space empty of matter including gas
Definition
vacuum
Term
the temperature at which a solid will become a liquid
Definition
melting point
Term
a change in which the physical properties of a substance are altered, but the chemical properties stay the same
Definition
physical change
Term
the production of a chemical reaction by passing an electric current through a liquid that contains postive and negative ions
Definition
electrolysis
Term
material that speeds up a chemical reaction without being used itself
Definition
catalyst
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