(l) phases.
- Second, write K = [products]/[reactants]
- Third, all coefficients in front of molecules become
exponents in the equilibrium expression.
Therefore, the correct choice is (A).
- D A conjugate acid/base pair is a set of 2 molecules/ions that have identical
molecular formulas, except that one of them has one more H+ than the
other. Only choice (D) represents a true pair of conjugates.
- B The starting solution has a pH of 3.5. Therefore, the starting solution
must be acidic. We can eliminate choices (C) and (D) because they are
bases. The subsequent titration experiment revealed a single equivalence
point, so the acid in question must be monoprotic—eliminate choice (E).
Since the equivalence point comes at pH 7, the unknown acid must be
strong. HCl is the only monoprotic strong acid given, choice (B).
- E Statements (A) through (D) can all be determined with data obtained
from a titration experiment.
- A The phase changes associated with the terms are
deposition (gas → solid)
sublimation (solid → gas)
liquefaction (gas→ liquid)
fusion (solid → liquid)
vaporization (liquid → gas)
- D The molecular formulas associated with the IUPAC names for organic
molecules are
methane: CH 4
ethane: CH 3 CH 3
