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5 Written questions

5 Matching questions

  1. Why is water in the solid phase less dense? How does this support life?
  2. Draw functional group structure and give molecular formula for: Carboxyl.
    Example?
  3. What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?
  4. What is a buffer?
  5. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
  1. a 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. 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 H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
  5. e 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 Multiple choice questions

  1. Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge
  2. Hydroxyl (polar, form hydrogen bonds, polar solvents)
    −OH (may be written HO-)
    Ex: Alcohols, such as Ethanol
  3. Carbon and Hydrogen
  4. 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. Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
    −SH
    Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)

5 True/False questions

  1. Describe the terms: solvent, solute, and solution.WATER!

          

  2. What are primary producers?Buffers are molecules that resist change in pH; they either release H⁺ to lower the pH or take up H⁺ to raise the pH

          

  3. What is the Universal Solvent?WATER!

          

  4. 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

          

  5. What two properties of water do plants take advantage of, to move water against gravity, explain?Yes. Ex: tiny tag from a functional group determines whether we are males or females

          

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