Chem I Exam 2/25/10
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Heat | Quantity of Energy
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| Temperature | A degree of hotness or coldness
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| Specific Heat | amount of heat required to raise the temperature of 1g of a substance by 1degree Celcius or 1K
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| Elements | Made up of atoms
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| Atoms | smallest of an element
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| Compounds | Two or more elements chemically united
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| Molecule | Smallest part of a compound
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| Compounds and Molecules are represented how? | Formulas
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| Law of Constant Composition | different samples of a pure compound will always contain the same elements in the same percent by weight
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| Empirical Formula | Indicates the elements to present in their ratio
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| Molecular Formula | indicates the elements to present in their exact numbers
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| Structural Formula | Indicates the elements present in their exact numbers and shows structure and bonding
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| Democrates | developed idea of atoms
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| Atomic Number | Number of proton in the nucleus
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| Atomic Mass | sum of protons and neutrons
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| Isotope | two or more atom of the same element that contain different numbers of neutrons therefore differ in atomic mass
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| Atomic Mass on Periodic Table | weighted average of all isotopes
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| Quark | smallest particle
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| Who came up with Quark? | Murray Gell-mann
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| What are the 3 pairs of Quark called? | Up/Down Top/Bottom Strange/Charmed
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| In Protons..how many Ups/Downs? | 2Up/1Down
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| In Neutrons...how many Ups/Downs? | 1Up/2Downs
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| 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
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| Subshells | S=2e-P=6e-D=10e-F=14e-
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| Heisenburg Uncertainity Principle | It is impossible to determine the position and momentum of an e- simultaneously
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| Hunds Rule | e- will fill all configurations singly before paring occurs
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| 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 +,-
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| Density formula | D= M/V
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| Volume Formula | V= V/D
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| Mass formula | M= VxD
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| Specific Gravity | Density of Substance/Density of H2O in same units
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| ○F to ○C Formula | 5/9(○F-32)
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| ○C to ○F Formula | 9/5○C+32
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| ○C to K | ○C+273
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| K to ○C | 273-○C
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| Calories Formula | (mass)(sp.heat)(Ti-Tf)
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| Heat Transfer Formula | (mass)(sp. heat)(Ti-Tf)=(mass)(sp. heat)(Ti-Tf)
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