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5 Written Questions

5 Matching Questions

  1. Describe how and why hydrogen bonds form in water.
  2. Why is water in the solid phase less dense? How does this support life?
  3. What are emergent properties of 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?
  5. What two properties of water do plants take advantage of, to move water against gravity, explain?
  1. a Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
  2. b Cohesion and Adhesion.
    Cohesion - waters ability to stick to ITSELF (other water molecules)
    Adhesion - waters ability to stick to OTHER THINGS that are POLAR
  3. c 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.
  4. d Waters specific heat is much higher that that of other solvents; this is because of hydrogen bonding; this keeps temperatures of places near/on bodies of water consistent
  5. e 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.

5 Multiple Choice Questions

  1. 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
  2. 4 and 4
  3. Amino (-NH₂) (acts as a base, amino acids); N single bonded to 2 H's

    H
    |
    −N
    |
    H

    Ex: Glycine
  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. 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)

5 True/False Questions

  1. 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

          

  2. Does form impact function?YES!

          

  3. Draw functional group structure and give molecular formula for: Methyl.
    Example?
    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

          

  4. What are the differences between a hydrophilic and hydrophobic substance?Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge

          

  5. Be able to recreate hydrogen bonding in water.
    (see p. 1 slide 4 in ch. 3)

          

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