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5 Written questions

5 Matching questions

  1. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
  2. Does form impact function?
  3. What is specific heat?
  4. What are the differences between a hydrophilic and hydrophobic substance?
  5. Describe how and why hydrogen bonds form in water.
  1. a Resistance to change in temperature
  2. b 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. c H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
  4. d YES!
  5. e Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge

5 Multiple choice questions

  1. 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. 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. Buffers are molecules that resist change in pH; they either release H⁺ to lower the pH or take up H⁺ to raise the pH
  4. Cohesion and Adhesion.
    Cohesion - waters ability to stick to ITSELF (other water molecules)
    Adhesion - waters ability to stick to OTHER THINGS that are POLAR
  5. A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.

5 True/False questions

  1. Draw functional group structure and give molecular formula for: Amino.
    Example?
    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

          

  2. How many valence electrons does carbon have? How many single covalent bonds can it form?4 and 4

          

  3. What is the Universal Solvent?WATER!

          

  4. Why is carbon the basic building element of life?WATER!

          

  5. Do the functional groups have an impact on life? Give an example.Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl

          

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