2. What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41) / 63.498
(A) 4.6
(B) 4.57
(C) 4.573
(D) 4.5728

23. Research using brain-imaging techniques has localized auditory hallucinations in the part of the brain called _____________. (A) Wernicke's area (B) Broca's area (C) the occipital lobe (D) the limbic system

24. The negative schizophrenic symptom called avolition is defined as (A) inability to initiate and persist in activities. (B) inability to experience pleasure. (C) lack of emotional response, blank facial expression. (D) lack of speech content and/or slowed speech response.

25. Tardive dyskinesia, a condition that can occur in patients who take antipsychotic medications, (A) can result from short-term use. (B) can result from low doses. (C) occurs in less than 2% of patients. (D) may often be irreversible.

1. A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 4.71 g/mL, 4.73 g/mL, 4.67 g/mL, 4.69 g/mL. If the actual value for the density of the sugar solution is 4.40 g/mL, which statement below best describes her results? (A) Her results are precise, but not accurate. (B) Her results are accurate, but not precise. (C) Her results are both precise and accurate. (D) Her results are neither precise nor accurate.

3. Write the name for Ca3(PO4)2. (A) calcium (III) phosphite (B) calcium (II) phosphite (C) calcium phosphate (D) tricalcium phosphorustetraoxide

4. Give the correct formula for aluminum sulfate. (A) Al2SO4 (B) Al(SO4)3 (C) Al3(SO4)2 (D) Al2(SO4)3

5. Determine the empirical formula for a compound that contains C, H and O. It contains 51.59% C and 35.30% O by mass. (C: 12.0 g/mol； H: 1.00 g/mol； O:6.0 g/mol) (A) C2H6O (B) CHO (C) (D) CH4O3

6. Give the theoretical yield, in grams, of CO2 from the reaction of 4.000 moles of with 4.000 moles of O2. (C: 12.0 g/mol； H: 1.00 g/mol； O: 16.0 g/mol) (A)112.7 g (B)102.4 g (C)176.0 g (D)704.0 g

7. The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)? (A) 0.20 M (B) 0.40 M (C) 0.10 M (D) 0.36 M

8. How many subshells are there in the shell with n = 4? (A) 3 (B) 4 (C) 6 (D) 18