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L03-character1 - LECTURE LECTURE 3 TOPIC TOPIC TOPIC...

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Characteristics of Hydrogen 1 8/19/2005 TOPIC TOPIC: Characteristics of Hydrogen LECTURE LECTURE # # 3 Source for Lecture: http://www.eere.energy.gov/hydrogenandfuelcells/tech_validation/pdfs/fcm01r0.pdf Unless otherwise noted.
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Characteristics of Hydrogen 2 8/19/2005 GOALS To have complete knowledge of the various topics square6 Atomic structure square6 Physical properties square6 Chemical properties
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Characteristics of Hydrogen 3 8/19/2005 square6 Simplest Element square6 Most Abundant Element (75% of all visible matter by mass and 90% by number) square6 Atomic Structure Nucleus – Proton– surrounded by: Electron Probability Cloud Basic Facts Nucleus containing 1 proton Electron cloud
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Characteristics of Hydrogen 4 8/19/2005 Molecular Structure Ref: www.ott.doe.gov
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Characteristics of Hydrogen 5 8/19/2005 Atomic Structure Isotopes boxshadowdwn Deuteron square6 Nucleus – 1proton,1neutron square6 (heavy hydrogen) boxshadowdwn Triton square6 Nucleus – 1proton,2 neutron square6 (Unstable, decay radioactivity)
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Characteristics of Hydrogen 6 8/19/2005 boxshadowdwn Mass of the atom square6 Mostly depends on nuclei square6 Proton is about 1800 times heavier than electron square6 Neutron has same weight as a proton square6 Empty space ( electron cloud) boxshadowdwn Electrical Charge square6 Proton – Positive; square6 Electron - Negative square6 Neutron – Neutral square6 Hydrogen Atom – Electrically neutral Atomic Structure
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Characteristics of Hydrogen 7 8/19/2005 boxshadowdwn Highly reactive – Becomes molecular H 2 Spin (direction of spin of the protons) boxshadowdwn Ortho Hydrogen square4 Same direction – 75% at normal conditions (STP) boxshadowdwn Para Hydrogen square4 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
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Characteristics of Hydrogen 8 8/19/2005 Source: www.ott.doe.gov Atomic Structure
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Characteristics of Hydrogen 9 8/19/2005 1. State: Solid, liquid & gas boxshadowdwn Temperature & Pressure effects boxshadowdwn
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