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Chem Witch

You guys are going to learn about chemistry today! Chemistry is basically just magic explained and is responsible for the ridiculously long looks Brad and I gave each other in that janky old house in my movie. Oh, and the part where my friend, Paulie, rapped with that weird dude. TOP THAT!.

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Chem Witch

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  1. You guys are going to learn about chemistry today! Chemistry is basically just magic explained and is responsible for the ridiculously long looks Brad and I gave each other in that janky old house in my movie. Oh, and the part where my friend, Paulie, rapped with that weird dude. TOP THAT!

  2. Chem Witch Chapter 2- The Chemical Context of Life Song: “Top That” from Teen Witch

  3. Chemical Foundations of Biology • Chemicals are used by animals for an array of reasons • Ex: Fig 2.1 Bombardier Beetle uses a boiling hot spray from glands in its abdomen as protection

  4. Elements and Compounds • Matter: Anything that takes up space and has mass • Element: Substance that cannot be broken down into other substances by chemical reactions (92 total) • Compounds: 2 or more elements combined by chemical bonds

  5. Essential/Trace Elements of Life • Carbon, Oxygen, Hydrogen, Nitrogen

  6. Isotopes • Atoms with the same number of protons, but different numbers of neutrons • Radioactive isotope • Nucleus decays spontaneously • Used in biology to date fossils, to follow atoms through the metabolism, used as tracers

  7. Chemical Bonds • Covalent Bonds • Sharing of valence electrons by 2 atoms • Ex: Oxygen gas, Nitrogen gas • Polar Covalent Bonds • One atom is slightly more electronegative than the other so the molecule is slightly polar • Ex: Water (Fig 2.12)

  8. Ionic Bonds • Electron is stripped away from the partner by the more electronegative atom • Compounds formed by ionic bonds are called salts • Ex: NaCl Sodium Chloride (Fig 2.14) • Cation-Positive charge • Anion-Negative Charge

  9. Weak Chemical Bonds • Hydrogen Bond (Fig 2.14) • Forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom • Van der Waals • Occur when atoms and molecules are very close together (atoms stick to one another) • Ex: Geckos walking up a wall surface

  10. Chemical Reactions • Reactants- Starting Materials • Products –Ending materials Ex: Photosynthesis (Fig 2.18) 6CO2 + 6H2O  C6H12O6 + 6O2

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