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5 Written questions

5 Matching questions

  1. What is specific heat?
  2. Draw functional group structure and give molecular formula for: Methyl.
  3. How many valence electrons does carbon have? How many single covalent bonds can it form?
  4. Organic molecules must always contain what?
  5. What is the pH scale?
  1. a 4 and 4
  2. b Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's

    −C − H

    Ex: 5-methyl cytidine
  3. c Resistance to change in temperature
  4. d Carbon and Hydrogen
  5. e pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution

5 Multiple choice questions

  1. Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².
  2. Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
  3. Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
    Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)
  4. 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

  5. (see p. 1 slide 4 in ch. 3)

5 True/False questions

  1. Describe how and why hydrogen bonds form in water.Hydrogen bonds are the bonds between two polar molecules - one with a partial positive charge and one with a partial negative charge; water is perfect for this because it has the partial negative of Oxygen and the partial positive of Hydrogen.


  2. Describe the terms: solvent, solute, and solution.Solvent: Substance doing the dissolving (water)
    Solute: Substance being dissolved (sugar or salt)
    Solution: homogenous mixture (product of solvent & solute)


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


  4. How does waters specific heat compare to other solvents specific heat? What properties does it have that allows this? What affect does this have on the climate?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


  5. How do acids and bases affect pH?Acids raise the concentration of H⁺ ions in an aqueous solution (decreases the pH number)
    Bases lower the concentration of H⁺ ions (increases the pH number)


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