temperature rise although heat is being added. Does the
second statement explain the first? Yes, it does. Since
the average kinetic energy of molecules stays constant
during a phase change (such as melting), the
temperature also remains constant. Fill in the CE oval.
- T, F The first statement is true. Adding a solute to a solvent reduces its
freezing point, raises its boiling point, and reduces its vapor pressure.
The second statement is false. Some, but not all, solutes dissociate
into positive and negative ions.
- T, T Divide and conquer. Statement I is true. A reaction will proceed
more quickly if its temperature is raised. Look at the second
statement. A large Keq absolutely means that a reaction favors the
forward reaction or, in other words, favors product formation. Both
statements are true. Put them together. Does the second explain the
first? No, it doesn’t. The first deals with reaction rates (kinetics) and
the second with equilibrium. These are different areas of chemistry, so
don’t fill in CE.
- T, F Hydrofluoric acid is not one of the six common strong acids; thus, it
will partially ionize and is a weak electrolyte. Hydrochloric acid is a
strong acid, and it ionizes completely. So HCl(aq) is a strong
electrolyte. Statement I is true. The second statement is false.
Remember that electronegativity values decrease down a given
column. So from fluorine to chlorine, electronegativity decreases.
- T, T, CE
The first statement is true. An example of this is the
carbon tetrachloride molecule, CCl 4 . It consists of four
polar bonds. However, the bonds are arranged such that
the overall molecule is nonpolar. Therefore, the second
statement is true. Since the second statement explains
the first, fill in the CE oval.
- F, T Divide and conquer. Does electrolysis generate electricity? No,
electrolysis involves the use of electrical energy to force a chemical
reaction to occur, so statement I is false. What about statement II? It’s
true. Electrons flow from the anode to the cathode in both
