M4_1-student - Unit 1 How do we distinguish substances?...

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Chemistry XXI Unit 1 How do we distinguish substances? Module 4: Determining Composition Central goal: To use experimental data to determine the atomic composition of the particles that make up a substance.
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Chemistry XXI The Challenge Analysis What is this? According to our models, differences between substances are the result of differences in the composition and structure of their particles. How can we determine what atoms and how many of each type comprise the molecules of any given substance ? C H O N Color Code
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Chemistry XXI Finding the Mass One first step could be determining the relative mass of the particles. For this purpose, we could use a Mass Spectrometer . 1. Particles are vaporized and broken into ions (charged particles). 2. The ions are accelerated and separated using a magnetic field. 3. The ratio mass/charge is recorded.
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Electrical Nature Mass spectrometry is based on our knowledge and understanding of the electrical nature of matter. When atoms or molecules lose or gain electrons they become electrically charged. The charged particles are called ions . We
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This note was uploaded on 04/09/2009 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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M4_1-student - Unit 1 How do we distinguish substances?...

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