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Water the solvent of life

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  • 1. Multiple Choice
    30 seconds
    5 pts

    Q. 

    An unusual characteristic of H2O is:

    Greater density in solid form (ice) than in liquid form

        (water).

    High heat of vaporization.

    Low specific heat.

    Not readily forming intermolecular interactions.

  • 2. Multiple Choice
    30 seconds
    5 pts

    Weak noncovalent interactions:

    Can have a large cumulative effect.

    Always involve water.

    Do not include ionic interactions.

    Combine to form covalent interactions.

  • 3. Multiple Choice
    30 seconds
    5 pts

    I need to calculate the pH of a weak acid. I know the concentration of the acid and its conjugate base, and my solution is at 30 °C. Using the Henderson-Hasselbalch equation, what else do I need?

    The Kd for H+ of the acid

    The free-energy change for the release of the H+

    The total H+ concentration (that is, free and bound to the acid)

    The pKa of the acid

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