Title: WQ section

Q: What is the boiling point of phenol?
A: 182 (± 3)

Q: The solution used to spike the shell sample in the standard addition method contains which acid?
- sulfuric acid
- nitric acid
- hydrochloric acid
A: sulfuric acid

Q: What is the electron configuration of cadmium?
- [Kr] 4d10 5s2
- [Ar] 3d10 4s2
- [Kr] 5s2
A: [Kr] 4d10 5s2

Q: What is the approximate temperature of the flame in an AAS instrument?
- 400-500 K
- 900-1150 K
- 2000-3000 K
- 3600-4000 K
A: 2000-3000 K

Q: Which solution has the greater nominal ionic strength: 5 mol/L NaOH or 5 mol/L NH_4OH?
- Both have the same ionic strength.
- sodium hydroxide
- ammonium hydroxide
A: Both have the same ionic strength.

Q: The pK_a of phenol is 10.0.  At pH 7.9, the majority of the phenol molecules are:
- protonated
- deprotonated
- positively charged
- negatively charged
A: protonated

Q: Which of the following hazards apply to concentrated ammonia solution (approx. 30 % in water)?
- toxic
- flammable
- carcinogenic (i.e, cancer-causing)
- corrosive
A: toxic; corrosive

Q: What is the oxidation state of tin in stannous chloride?
- +2
- +3
- +4
- +1
A: +2

Q: Which type of phosphates can be quantified without digestive sample treatment?
- orthophosphates
- condensed phosphates
- organic phosphates
A: orthophosphates

Q: Which of the following half-reactions of persulfate is correct (under the conditions in experiment WQ11)?
- (S2O8)2- + 2e- --> 2 (SO4)2-
- (S2O8)2- + 2H+ --> (S2O7)2- + H2O
- (S2O8)2- + 2e- --> 2 (SO3)2- + O2
A: (S2O8)2- + 2e- --> 2 (SO4)2-