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Barrel

Bunsen Burner & Gas Valve. Barrel. Air Valve/Intake. Gas Inlet. Gas Control Valve. Base. http://upload.wikimedia.org/wikipedia/commons/7/70/Bunsen_Burner_(PSF).jpg. The Flame. Gas Valve for Adjusting Flame Iron ring very HOT!!! Gas off when burner not lit. No. Yes. Low Heat.

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Barrel

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  1. Bunsen Burner & Gas Valve Barrel Air Valve/Intake Gas Inlet Gas Control Valve Base http://upload.wikimedia.org/wikipedia/commons/7/70/Bunsen_Burner_(PSF).jpg

  2. The Flame • Gas Valve for Adjusting Flame • Iron ring very HOT!!! • Gas off when burner not lit No Yes Low Heat High Heat http://www.greece.k12.ny.us/oly/chemistry/Chemistry%20Icons/Lab%20Apparatus/burner%20parts.jpg

  3. ExperimentalSet Up • Vent Crucible Lid • Crucible Very Hot VENTED

  4. Crucibles EXTREMELY hot. • Crucible tongs to transfer. • Cooling on gauze. • Mass when cool to the touch. • Mass the lid AND the crucible.

  5. CONSTANT COMPOSITION Hi, I’m Magnesium! • All atoms of same element are the same. • Different element atoms are different. • Compounds have fixed whole number ratios. • Water is always H2O 8 P 8 N 12 P 12 N I thought I was magnesium?!?

  6. Law of Conservation • Impossible to measure mass of oxygen • The sum of the parts equals the whole • Conservation of Mass Metal + Oxygen  Metal Oxide Mass 1 (Mass 2 – Mass 1) Mass 2 Metal Oxide - Metal  Oxygen

  7. Reactions Occurring • First Heating • Magnesium + Oxygen  Magnesium Oxide • Magnesium + Nitrogen  Magnesium Nitride • Second Heating (Low Heat) • Magnesium Nitride + Water  Magnesium Hydroxide + Ammonia • Second Heating (High Heat) • Magnesium Hydroxide  Magnesium Oxide + Water

  8. Calculations • Oxygen is 16 amu or grams/mol. • The calculations can not be completed until experiment is finished. • Roman numerals from table.

  9. Magnesium Uses • Melting point of 1202°F (650°C) • Boiling point of 1994°F (1090°C). • Never use H2O or CO2 extinguishers to put out Mg fire • Alloys • Artificial limbs • Vacuum cleaners • Optical instruments • Skis

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