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Chem I Exam 2/25/10

QuestionAnswer
Heat Quantity of Energy
Temperature A degree of hotness or coldness
Specific Heat amount of heat required to raise the temperature of 1g of a substance by 1degree Celcius or 1K
Elements Made up of atoms
Atoms smallest of an element
Compounds Two or more elements chemically united
Molecule Smallest part of a compound
Compounds and Molecules are represented how? Formulas
Law of Constant Composition different samples of a pure compound will always contain the same elements in the same percent by weight
Empirical Formula Indicates the elements to present in their ratio
Molecular Formula indicates the elements to present in their exact numbers
Structural Formula Indicates the elements present in their exact numbers and shows structure and bonding
Democrates developed idea of atoms
Atomic Number Number of proton in the nucleus
Atomic Mass sum of protons and neutrons
Isotope two or more atom of the same element that contain different numbers of neutrons therefore differ in atomic mass
Atomic Mass on Periodic Table weighted average of all isotopes
Quark smallest particle
Who came up with Quark? Murray Gell-mann
What are the 3 pairs of Quark called? Up/Down Top/Bottom Strange/Charmed
In Protons..how many Ups/Downs? 2Up/1Down
In Neutrons...how many Ups/Downs? 1Up/2Downs
Bohrs Theory 1.The nucleus is sorrounded by e- at definite circular orbits.2. Because of their position and momentum the e- passes energy3.the shell(energy state) closest to the nucleus is N=1. This is the lowest energy4. The max # of e- at any shell e-=2(N)sq
Subshells S=2e-P=6e-D=10e-F=14e-
Heisenburg Uncertainity Principle It is impossible to determine the position and momentum of an e- simultaneously
Hunds Rule e- will fill all configurations singly before paring occurs
Pauli Exclusion Principle No 2 e-'s in any single atom can have the same set of 4 quantum numbers1.shell N=1,N=22.subshell S,P,D,F3.configuration Px,Py,Pz4.spin +,-
Density formula D= M/V
Volume Formula V= V/D
Mass formula M= VxD
Specific Gravity Density of Substance/Density of H2O in same units
○F to ○C Formula 5/9(○F-32)
○C to ○F Formula 9/5○C+32
○C to K ○C+273
K to ○C 273-○C
Calories Formula (mass)(sp.heat)(Ti-Tf)
Heat Transfer Formula (mass)(sp. heat)(Ti-Tf)=(mass)(sp. heat)(Ti-Tf)
Created by: cyclguy