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5 Written Questions

5 Matching Questions

  1. Draw functional group structure and give molecular formula for: Carboxyl.
    Example?
  2. What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?
  3. How do acids and bases affect pH?
  4. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
  5. What is the Universal Solvent?
  1. a H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
  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 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 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. e WATER!

5 Multiple Choice Questions

  1. 4 and 4
  2. Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
  3. Phosphate (−OPO₃²⁻) (acid: DNA, cell membrane, ATP); P double to O, single to O, 2 O⁻

    O

    −O−P−O⁻
    |
    O⁻

    Ex: glycerol phosphate
  4. pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution
  5. Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)

5 True/False Questions

  1. Organic molecules must always contain what?WATER!

          

  2. What are the different types of isomers (changes) and how are they different?Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge

          

  3. 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)

          

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

          

  5. Why is water in the solid phase less dense? How does this support life?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.

          

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