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Chem I Exam 2/25/10
| Question | Answer |
|---|---|
| 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
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