12 Questions
What type of interactions determine steric complementarity and stabilize biological macromolecules?
Van der Waals interactions
Which type of non-covalent interactions involve electrostatic interactions between permanently charged species?
Ionic interactions
What is the complex phenomenon associated with the ordering of water molecules around non-polar substances?
The hydrophobic effect
Which non-covalent interactions do not involve sharing a pair of electrons?
Van der Waals interactions
What is the geometry of the water molecule?
Tetrahedral
Why can water serve as both a hydrogen bond donor and acceptor?
As a result of its dipole moment
What induces a net dipole moment in the water molecule?
The electronegativity of the oxygen atom
How many other water molecules can each water molecule connect to due to its dipole moment?
4
What does the pH of the solution equal at the midpoint of the titration curve?
pKa of the acid
What characterizes the buffer region on the titration curve?
It is a flat line region around +/- 1 pH away from the pKa
At what point in the titration curve is the acid most readily able to give up protons?
At the lowest pH
How can the pKa of an acid be determined using titration?
By adding equivalents of a base with known concentration until reaching the midpoint where acid = base
This quiz provides a summary of the chapter 'Water and Aqueous Solutions', covering interactions between molecules, aggregation of nonpolar moieties in water, behavior of weak acids and bases in water, and the function of buffers.
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