Transcription of AP* Chemistry STOICHIOMETRY
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AP* Chemistry STOICHIOMETRY
AP* Chemistry STOICHIOMETRY *AP is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product. 2008 by Ren McCormick. All rights reserved. ATOMIC MASSES 12C Carbon 12 In 1961 it was agreed that this would serve as the standard and would be defined to have a mass of EXACTLY 12 atomic mass units (amu). All other atomic masses are measured relative to this. mass spectrometer a device for measuring the mass of atoms or molecules o atoms or molecules are passed into a beam of high-speed electrons o this knocks electrons OFF the atoms or molecules transforming them into cations o apply an electric field o this accelerates the cations since they are repelled from the (+) pole and attracted toward the ( ) pole o send the accelerated cations into a magnetic field o an accelerated cation creates it s O
Stoichiometry 3 suited to the multi-step problems you will face on the AP Exam. Secondly, these techniques better prepare you to work the complex equilibrium problems you will face later in this course.
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