ch369_sp11_class_2_notes

ch369_sp11_class_2_notes - Size scale of the biochemical...

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Size scale of the biochemical world. How big is an atom? Length of chemical bond? Size of a typical cell? Wavelength of visible light? What size can you see with an ordinary optical microscope?
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How do we know the age of the earth? One way is from radioactive decay products in rocks. For example: When zircon crystals form, they include U-238 as an impurity, but exclude Pb. So any Pb within zircon crystals must be from the decay of uranium. So, uranium / lead ratio in zircon crystals can tell how long ago the crystal was formed. Half-life of U-238 is 4.47 billion years (U decays to Pb). Oldest rocks are over 4 x 10 9 years old.
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Structure of ice (lots of hydrogen bonds).
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A snapshot of liquid water, from water wiki. Hydrogen bonds between molecules of liquid water break and reform frequently. Molecules of liquid water continuously change their neighbors.
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Hydrogen bonds - strong enough to be useful, yet weak enough to be easily formed and broken again.
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Notice that the 3 atoms that form the hydrogen bond are nearly along the same line (H-bonds are usually within about 15 degrees of being linear).
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ch369_sp11_class_2_notes - Size scale of the biochemical...

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