properties of matter element hydrogen molecule, h 2 element oxygen molecule, o 2 mixture a mixture...
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ELEMENTELEMENT
hydrogen molecule, H2
ELEMENTELEMENT
oxygen molecule, O2
MIXTUREMIXTURE
a mixture ofhydrogen and oxygen molecules
CHEMICAL REACTIONCHEMICAL REACTION
if molecules collide with enoughforce to break them into atoms, a can take place
COMPOUNDCOMPOUND
water, H2O
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2 H22 H2 O2
O2 2 H2O2 H2O++ ++ EE
Copyright © 2007 Pearson Benjamin Cummings. All rights reserved.
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The Zeppelin LZ 129 Hindenburg catching fire on May 6, 1937 at Lakehurst Naval Air Station in New Jersey.
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S.S. Hindenburg
35 people died when the Hindenburg exploded.
May 1937 at Lakehurst, New Jersey
• German zeppelin luxury liner
• Exploded on maiden voyage
• Filled with hydrogen gas
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Hydrogen is the most effective buoyant gas,but is it highly flammable. The disastrous fire in the Hindenburg, a hydrogen-filled dirigible, in 1937 led to the replacement of hydrogen by nonflammable helium.
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Erosion Takes a Powder
TreatedUntreated
Top soil r
unoff
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Sodium Polyacrylate
• Absorbent Material– Absorbs 700x volume of water
• Magicians– Pour water in hat and it “disappears”
• Diapers• Farmers
– Anti-erosion powder
• Add to Soils– hold moisture between watering
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Specific Heats of Some Substances
Specific Heat
Substance (cal/ g oC) (J/g oC)
Water 1.00 4.18Alcohol 0.58 2.4Wood 0.42 1.8Aluminum 0.22 0.90Sand 0.19 0.79Iron 0.11 0.46Copper 0.093 0.39Silver 0.057 0.24Gold 0.031 0.13