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Chapter 1
Chemistry Terms
26
Chemistry
Undergraduate 2
09/12/2010

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Term
Chemistry
Definition
the science that deals with the composition and properties of substances and various elementary forms of matter.
Term
Matter
Definition
anything that has mass and occupies space.
Term
Mass
Definition
a measurement of the amount of matter in an object.
Term
Weight
Definition
a measurement of the gravitational force acting on an object.
Term
Volume
Definition
the amount of space, measured in cubic units, that an object or substance occupies.
Term
Density
Definition
the number given when the mass of a sample of a substance is divided by the volume of the same sample.
Term
Physical Property
Definition
a property of matter that can be observed or measure without trying to change the composition of the matter being studied.
Term
Physical Change
Definition
a change matter undergoes without changing composition.
Term
Chemical Property
Definition
a property matter demonstrates when attempts are made to change it into new substances.
Term
Chemical Change
Definition
a change matter undergoes that involves changes in composition.
Term
Molecule
Definition
the smallest particle of a pure substance that has the properties of that substance.
Term
Atom
Definition
the limit of chemical subdivision for matter.
Term
Homoatomic
Definition
only one kind of atom.
Term
Heteroatomic
Definition
two or more kind of atoms.
Term
Diatomic
Definition
two atoms.
Term
Triatomic
Definition
three atoms.
Term
polyatomic
Definition
three or more atoms.
Term
Homogeneous Matter
Definition
matter that has the same properties throughout the sample.
Term
Heterogeneous Matter
Definition
matter with properties that are not the same throughout the sample.
Term
Heterogeneous Matter
Definition
matter with properties that are not the same throughout the sample.
Term
Pure Substance
Definition
matter that has a constant composition and fixed properties.
Term
Element
Definition
a pure substance consisting of only one kind of atom in the form of homoatomic. molecules or individual atoms.
Term
Compound
Definition
a pure substance consisting of two or ore kinds of atoms in the form of heteroatomic molecules or individual atoms.
Term
Significant Figures
Definition
the numbers in a measurement that represent the certainty of the measurement, plus one number representing an estimate.
Term
Isotope
Definition
atoms having the same atomic number but different mass numbers.
Term
Mole
Definition
the number of particles (atoms or molecules) contained in a sample of element or compound with a mass in grams equal to the atomic or molecular weight, respectively.
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