L03-character1 - Characteristics of Hydrogen 1 8/19/2005...

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Unformatted text preview: Characteristics of Hydrogen 1 8/19/2005 TOPIC TOPIC TOPIC TOPIC: C h a r a c t e r i s t i c s o f H y d r o g e n LECTURE LECTURE LECTURE LECTURE # # # # 3 Source for Lecture: http://www.eere.energy.gov/hydrogenandfuelcells/tech_validation/pdfs/fcm01r0.pdf Unless otherwise noted. Characteristics of Hydrogen 2 8/19/2005 GOALS To have complete knowledge of the various topics s Atomic structure s Physical properties s Chemical properties Characteristics of Hydrogen 3 8/19/2005 s Simplest Element s Most Abundant Element (75% of all visible matter by mass and 90% by number) s Atomic Structure Nucleus Proton surrounded by: Electron Probability Cloud Basic Facts Nucleus containing 1 proton Electron cloud Characteristics of Hydrogen 4 8/19/2005 Molecular Structure Ref: www.ott.doe.gov Characteristics of Hydrogen 5 8/19/2005 Atomic Structure Isotopes b Deuteron s Nucleus 1proton,1neutron s (heavy hydrogen) b Triton s Nucleus 1proton,2 neutron s (Unstable, decay radioactivity) Characteristics of Hydrogen 6 8/19/2005 b Mass of the atom s Mostly depends on nuclei s Proton is about 1800 times heavier than electron s Neutron has same weight as a proton s Empty space ( electron cloud) b Electrical Charge s Proton Positive; s Electron - Negative s Neutron Neutral s Hydrogen Atom Electrically neutral Atomic Structure Characteristics of Hydrogen 7 8/19/2005 b Highly reactive Becomes molecular H 2 Spin (direction of spin of the protons) b Ortho Hydrogen s Same direction 75% at normal conditions (STP) b Para Hydrogen s Opposite direction, at lower temperature (transition realizes heat) Atomic Structure E=171 K <300 K Figure adapted from Cryogenic Engineering by Thomas M. Flynn, Dekker:NY (1997), p. 128 Characteristics of Hydrogen 8 8/19/2005 Source: www.ott.doe.gov Atomic Structure Characteristics of Hydrogen 9 8/19/2005 1. State: Solid, liquid & gas b Temperature & Pressure effects b Boiling, Freezing, Condensation, Melting s Boiling point of 20 K (423 F; 253 C)...
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This note was uploaded on 09/05/2011 for the course LECTURE 101 taught by Professor Staff during the Fall '09 term at University of Florida.

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L03-character1 - Characteristics of Hydrogen 1 8/19/2005...

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