Vocabulary Chapter 3 Flashcard

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

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