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5 Written questions

5 Matching questions

  1. Does form impact function?
  2. Describe how and why hydrogen bonds form in water.
  3. Draw functional group structure and give molecular formula for: Methyl.
    Example?
  4. Why is water in the solid phase less dense? How does this support life?
  5. What is the Universal Solvent?
  1. a 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.
  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 YES!
  4. d 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. e WATER!

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. Small organic molecules with great effects:
    Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
  3. Fix C from atmospheric CO₂ (ex: Plants w/ photosynthesis)
  4. Solvent: Substance doing the dissolving (water)
    Solute: Substance being dissolved (sugar or salt)
    Solution: homogenous mixture (product of solvent & solute)
  5. Carbonyl (>CO) (ketones, aldehydes, sugars); C double bonded to O

    O

    −C
    |

    Ex: Acetone, the simplest ketone

5 True/False questions

  1. Describe surface tension and give an example relating to living organisms.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. Be able to recreate hydrogen bonding 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.

          

  3. What are the differences between a hydrophilic and hydrophobic substance?1.) Structural - changes structural form; same formula, different structure
    2.) Geometric - differ in spatial arrangement due to inflexibility of double bond (two types: cis and trans) 3.) Enantiomers - mirror images of each other

          

  4. Draw functional group structure and give molecular formula for: Sulfhydryl.
    Example?
    Hydroxyl (polar, form hydrogen bonds, polar solvents)
    −OH (may be written HO-)
    Ex: Alcohols, such as Ethanol

          

  5. Be able to calculate the molar concentrations of hydrogen and hydroxide ions from a given pH value or vice versa.H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)