NAME: ________________________

Biology Exam I: Ch. 3 & 4 Test

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5 Written Questions

5 Matching Questions

  1. What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?
  2. What is a hydrocarbon? Polar or non-polar?
  3. What is the pH scale?
  4. What are functional groups? Names?
  5. What are emergent properties of water?
  1. a 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. b Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
  3. c Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
  4. d Small organic molecules with great effects:
    Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
  5. e pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution

5 Multiple Choice Questions

  1. 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)
  2. Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)
  3. Carbon and Hydrogen
  4. 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. Fix C from atmospheric CO₂ (ex: Plants w/ photosynthesis)

5 True/False Questions

  1. Know functional group NAMES, MOLECULAR FORMULAS, and STRUCTURES!Yes. Ex: tiny tag from a functional group determines whether we are males or females

          

  2. How many valence electrons does carbon have? How many single covalent bonds can it form?Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)

          

  3. Be able to calculate the molar concentrations of hydrogen and hydroxide ions from a given pH value or vice versa.Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².

          

  4. What is specific heat?pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution

          

  5. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².

          

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