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Exam 1 Study Guide

by: Noemie Trocher

Exam 1 Study Guide CH 101

Marketplace > Boston University > CH 101 > Exam 1 Study Guide
Noemie Trocher

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About this Document

Covers key concepts and points from lecture and discussions.
General Chemistry
Dr. Dill
Study Guide
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This 2 page Study Guide was uploaded by Noemie Trocher on Thursday September 22, 2016. The Study Guide belongs to CH 101 at Boston University taught by Dr. Dill in Fall 2016. Since its upload, it has received 3 views.


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Date Created: 09/22/16
CH101 Exam 1 Study Guide Key Concepts of Lectures: - Atoms: ● About 10 cm in diameter ● Some atoms have isotopes ○ Common Isotopes: Element Isotope Abundanc Mass Isotope Abundanc Mass e e Carbon C-12 99% 12 C-13 1% 13 Oxygen O-16 99.8% 15.99 O-18 0.2% 18 Nitrogen N-14 99.7% 14 N-15 0.3% 15 Hydroge H-1 99.99% 1 H-2 0.01% 2 n Chlorine Cl-35 75% 35 Cl-37 25% 37 Bromine Br-79 50% 79 Br-81 50% 81 ● Atomic Mass unit u: exactly (1/12) mass of 1 C-12 atom orA(g/N ) ● Average mass of element = mass 1 abundance +1m f 2 2 ● Average mass of atom = atomic mass(g)/ NA ● Molar mass is equivalent to atomic mass 23 ● Avogadro's number: 6.0221 x 10 atoms per mole - Common monatomic ions Group 1A Group 6A Fe Zn 2+ Bi 3+ Ti 4+ Mn 2+ 1+ 2- 2+/3+ Group 2A Group 7A Cu Ag 1+ Cr Cd 2+ Co 2+/3+ 2+ 1- 1+/2+ 2+/3+ Group 5A Ni 2+ Hg 2+ Al 1+ Hg22+ Sn 2+ Co 2+/3+ 3- ● Negatively charges ions have suffix -ide - Mass spectrometer ● Strips compound of 1 electron then deflects them through magnetic field ○ Less deflection = heavier mass ● All fragments will have a POSITIVE CHARGE ● Constitutional isomer: same elements and # of elements; different structure ● Compounds with Cl or Br will have more that one molecular ion peak - Wavelength, frequency, and wavenumber ● Wavelength: distance cover in time (λ) ● Frequency (v = (1/���t): the number of waves that pass a point in a certain time; given in Hertz ● Speed = λv 8 ● C = speed of light = 2.99 x 10 m/s ● Wavenumber, -Electromagnetic Spectrum ● Rhythmic tugs on electron cloud -> see color ● Rhythmic tugs on bonds between atoms -> feel heat ● Gamma -> x-rays -> UV -> visible light (blue-red) -> IR -> microwaves -> radio waves ● Lighter compounds/ stronger bonds = high frequency Key Concepts of Discussions: - Significant Figures ● Use least accurate apparatus when adding/subtracting/multiplying/dividing - Dimensional Analysis ● WRITE DOWN UNITS


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