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Chapter 1 Terms
Chemistry - Chapter 1 Terms
30
Chemistry
Undergraduate 1
09/07/2007

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Term
International System of Units (SI)
Definition
Measurement system in which scientific community uses. Derived from older metric system.
Term
Mass
Definition
Measurement of matter.
Term
Weight
Definition
Gravitational force exerted on object.
Term
Volume
Definition
Amount of space occupied.
Term
Potential Energy
Definition
Stored energy.
Term
Kinetic Energy
Definition
Energy of motion.
Term
Heat Energy
Definition
Kinetic energy of moving chemical particles. (Energy from hotter to colder unit).
Term
Calorie
Definition
Quanitity of heat energy required to raise the temp. of 1g og water 1 degree Centigrade.
Term
Joule
Definition
Quantity of kinetic energy possessed by a 2 kg moving with a velocity of 1m/sec.
Term
Specific Heat
Definition
Quanitity of heat energy requaired to raise temp. one degree Centigrade.
Term
Density
Definition
Mass per unit volume.
Term
Specific Gravity
Definition
Density of a sample divided by the density of water.
Term
Conversion Factor
Definition
Relationship between diff. units of measurement.
Term
Matter
Definition
Anything that has mass & occupies space.
Term
Energy
Definition
Capacity to do work or supply heat.
Term
Chemical Composition
Definition
Elements that make up a substance & the mass percent of the elements.
Term
Heterogeneous Sample
Definition
Oil & Water. Are not blended together.
Term
Homogeneous Sample
Definition
Sugar & Water. Blended/Mixed together.
Term
Physical Change
Definition
And change in a sample that does not change the chemical composition.
Term
Chemical Change
Definition
Change in chemical composition.
Term
Mixture
Definition
Composed of pure substances mixed together; can be separated.
Term
Compound
Definition
Combo of elements forming a pure substance. (H2O).
Term
Element
Definition
Pure substance that cannot be separated into any other substances.
Term
Atom
Definition
Smallest particle possesing all the properties of that element.
Term
Molecule
Definition
Smallest particle of covalent compounds.
Term
Formula Unit
Definition
Smallest particle of ionic compounds.
Term
Chemical Formula
Definition
Symbolic Represntation of a substance. Cl2H3
Term
Metals
Definition
Lustrous in appearance, malleable, ductile, good conductors of heat & electricity. Hg not a solid at room temp.
Term
Nonmetals
Definition
Dull in appearance, can be solids, liquids, or gases, poor conductors of heat & electricity.
Term
Metalloids
Definition
Elements intermediate between metals & nonmetals.
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