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5 Written questions

5 Matching questions

  1. What two properties of water do plants take advantage of, to move water against gravity, explain?
  2. Does form impact function?
  3. What is the pH scale?
  4. What are functional groups? Names?
  5. What is a hydrocarbon? Polar or non-polar?
  1. a Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
  2. b pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution
  3. c YES!
  4. d Small organic molecules with great effects:
    Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
  5. e 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 Multiple choice questions

  1. Hydroxyl (polar, form hydrogen bonds, polar solvents)
    −OH (may be written HO-)
    Ex: Alcohols, such as Ethanol
  2. 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. 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
  4. Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
  5. 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 True/False questions

  1. Describe the terms: solvent, solute, and solution.Solvent: Substance doing the dissolving (water)
    Solute: Substance being dissolved (sugar or salt)
    Solution: homogenous mixture (product of solvent & solute)

          

  2. What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)

          

  3. 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.

          

  4. What is a buffer?A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.

          

  5. Organic molecules must always contain what?WATER!