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5 Written questions

5 Matching questions

  1. Does form impact function?
  2. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
  3. Draw functional group structure and give molecular formula for: Amino.
    Example?
  4. Why is water in the solid phase less dense? How does this support life?
  5. Draw functional group structure and give molecular formula for: Carboxyl.
    Example?
  1. a YES!
  2. b 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
  3. c H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
  4. d 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. e Amino (-NH₂) (acts as a base, amino acids); N single bonded to 2 H's

    H
    |
    −N
    |
    H

    Ex: Glycine

5 Multiple choice questions

  1. Carbonyl (>CO) (ketones, aldehydes, sugars); C double bonded to O

    O

    −C
    |

    Ex: Acetone, the simplest ketone
  2. Resistance to change in temperature
  3. 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.
  4. 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
  5. 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 True/False questions

  1. 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)

          

  2. What is a hydrocarbon? Polar or non-polar?WATER!

          

  3. How many valence electrons does carbon have? How many single covalent bonds can it form?Carbon and Hydrogen

          

  4. Organic molecules must always contain what?Carbon and Hydrogen

          

  5. Why is carbon the basic building element of life?Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)