ELEMENT 1: HYDROGEN

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ELEMENT 1 HYDROGEN
Jesse H Chemistry Per. 5
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FACTS

• Density _at_ 293 K- 0.0000899g/cm3
• Melting point- 14.06K
• Boiling point- 20.4K
• Electrical conductivity- 1/mohm-cm
• Thermal conductivity- 0.18 J/m-sec-deg
• Heat of fusion- 0.05868 kJ/mol
• Heat of vaporization- 0.44936 kJ/mol

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FACTS

• Hydrogen is the lightest element.
• It is by far the most abundant element in the
  universe and makes up about about 90 of the
  universe by weight.

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HISTORY

• Discovered in 1776, by Henry Cavendish, in
  London, England.
• The origin of the name comes from the Greek words
  "hydro" and "genes" meaning "water" and
  "generator
• Robert Boyle published a paper in 1671 in which
  he described the reaction between iron filings
  and dilute acids which results in the evolution
  of gaseous hydrogen

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HISTORY

• The lifting agent for the Hindenberg ballooon was
  hydrogen rather than the safer helium

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USES

• Commercial fixation of nitrogen from the air in
  the Haber ammonia process
• Hydrogenation of fats and oils
• Rocket fuel
• Welding
• Production of hydrochloric acid
• Reduction of metallic ores

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USES

• For filling balloons (hydrogen gas much lighter
  than air however it ignites easily)
• Liquid H2 is important in cryogenics and in the
  study of superconductivity since its melting
  point is only just above absolute zero

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COMIC
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SOURCES

• www.chemistrygeek.com
• www.webelements.com
• The Chemical periodic table at MIT