Lecture 2 Chapter 3

# Lecture 2 Chapter 3 - Exam Room Assignments (These are also...

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Unformatted text preview: Exam Room Assignments (These are also posted on our LMS site) 1110-03 DCC 318 1100-06 DCC 308 1100-10 Sage 3303 Reminder: High School Knowledge Exam is on Wednesday (September 9 th ) at 8am. Make sure that you bring a #2 pencil and a scientific calculator (NO Graphing Calculators Allowed) Chapter 3 Lecture 2, September 4 2009 New SI (Supplemental Instruction) Session Information: Tuesday September 8 th : Review for HSK Exam, 8-10pm in DCC 337 Starting on September 15 th : SI sessions will be Tuesdays and Thursdays, 6:30 8:30pm in DCC 239 (Note that the information I posted in my first lecture has changed) Empirical and Molecular Formulas How to find an unknown compounds chemical formula or confirm the formula of something we think we know find substances empirical formula Two main ways to determine empirical formula: 1. Elemental Analysis gives us information about the mass percent of elements in a compound. Example: Analysis of Zircon, a diamond-like mineral, shows that it contains 34.91% O, 15.32% Si, 49.76% Zr. The molar mass of zircon is known to be less than 200 g/mol. Determine the molecular formula of Zircon. (Example of Elemental Analysis ) Gwdir.demon.co.uk/jo/minerals/zircon.htm 2. Combustion Analysis burn a sample in excess O 2 gas (sample will typically contain Carbon, Hydrogen and sometimes Oxygen) Example:...
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## This note was uploaded on 04/04/2011 for the course CHEM 1100 taught by Professor Mcintosh during the Fall '08 term at Rensselaer Polytechnic Institute.

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Lecture 2 Chapter 3 - Exam Room Assignments (These are also...

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