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5 Written questions

5 Matching questions

  1. What is a hydrocarbon? Polar or non-polar?
  2. Draw functional group structure and give molecular formula for: Methyl.
    Example?
  3. Describe surface tension and give an example relating to living organisms.
  4. What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?
  5. Draw functional group structure and give molecular formula for: Sulfhydryl.
    Example?
  1. a Hydrogen bonds in water hold each other together stronger than they'd bond to the air, for example. Ex: Jesus Christ lizard can walk on water because of it's surface tension; a dragonfly has non-polar exoskeleton so water beads on it
  2. b Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's

    H
    |
    −C − H
    |
    H

    Ex: 5-methyl cytidine
  3. c Heat required to convert 1g of liquid into a gaseous state (high); Evaporative cooling is the warmest molecules of a liquid leave as a gas; allows us to sweat, or release heat so we don't die
  4. d Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
  5. e Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
    −SH
    Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)

5 Multiple choice questions

  1. Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH

    O

    −C
    |
    OH

    Ex: Formic acid or acetic acid
  2. Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².
  3. A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.
  4. Fix C from atmospheric CO₂ (ex: Plants w/ photosynthesis)
  5. Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
    The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.

5 True/False questions

  1. What are emergent properties of water?Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)

          

  2. What is a buffer?Buffers are molecules that resist change in pH; they either release H⁺ to lower the pH or take up H⁺ to raise the pH

          

  3. Describe the terms: solvent, solute, and solution.WATER!

          

  4. Why is carbon the basic building element of life?WATER!

          

  5. What is specific heat?Resistance to change in temperature

          

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