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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
2 H22 H2 O2
O2 2 H2O2 H2O++ ++ EE
Copyright © 2007 Pearson Benjamin Cummings. All rights reserved.
The Zeppelin LZ 129 Hindenburg catching fire on May 6, 1937 at Lakehurst Naval Air Station in New Jersey.
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
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.
Erosion Takes a Powder
TreatedUntreated
Top soil r
unoff
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
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