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Vocabulary Chapter 3
1st quiz
29
Chemistry
12th Grade
09/24/2006

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Term
System
Definition
part of the universe under consideration.
Term
heat
Definition
energy transferred due to difference in temperature.
Term
joule
Definition
the Si unit of enrgy
Term
endothermic
Definition
a change that takes place with the absorption of heat
Term
exothermic
Definition
a change that produces heat
Term
activation energy
Definition
the enrgy required to form activated complex
Term
calorimeter
Definition
device for measuring the transfer of heat during a chemical orphysical change
Term
specific heat
Definition
the amount of energy required to raise the temperature of one gram of a substance by one celcius degree.
Term
physical change
Definition
a change in which the same substance is present.
Term
chemical change
Definition
a rearrangement of atoms and or molecules to produce one or more new substances with new properties.
Term
precipitate
Definition
solid, produced by a reaction, that seperates froma solution.
Term
physical property
Definition
property that can be observed without a change of substance.
Term
chemical property
Definition
a property characteristic of a substance when it is involved in a chemical change.
Term
extensive property
Definition
a property dependent on a the amount of matter present
Term
intensive property
Definition
a property dependent on the amount of matter present.
Term
material
Definition
a specific kind of matter
Term
mixture
Definition
a material consisting of two or more substances
Term
phase
Definition
a physically distinct section of matter with uniform properties sett off from the surrounding matter by physical bounderies.
Term
heterogeneous mixture
Definition
a combination of two or more substances that are not uniformly dispersed.
Term
interface
Definition
the area of contact between two phases
Term
homogeneous
Definition
uniform throughout
Term
solution
Definition
homogeneous mixture compound of solute and solvent
Term
solute
Definition
substance present in the lesser amount of a solution
Term
solvent
Definition
substance present in the greater amoung in a solution
Term
substance
Definition
material with a constant composition
Term
element
Definition
substance whose atoms all have the same number of protons in the nucleus
Term
compound
Definition
substance composed of atoms of two or more elements linked by chemical bonds
Term
organic substance
Definition
compound that contains the element carbon; a few carbon compounds are considered inorganic.
Term
inorganic substance
Definition
a molecular compound that does not contain carbon
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