AAMC MCAT Exam 4- Chem/Phys| QUESTIONS &ANSWERS| ALREADY PASSED|VERIFIED & UPDATED

Limestone does NOT decompose when heated to 900 K because, at 900 K, ΔH is: A. positive and less than TΔS. B. positive and greater than TΔS. C. negative and less than TΔS. D. negative and greater than TΔS. - ANSWER B. positive and greater than TΔS. The reaction does not occur (is not spontaneous). This indicates that ΔG = ΔH - TΔS 0. From inspection of the reaction, it can be concluded that ΔS 0 (a gas evolves). Consequently, ΔH TΔS explains why the reaction does not occur. According to Table 1, what is the concentration of the glucose in the blood from which the diluted sample was taken? A. 60 mg/dL B. 90 mg/dL C. 120 mg/dL D. 150 mg/dL - ANSWER D. 150 mg/dL From Table 1, the glucose concentration in the diluted sample is (0.20/0.24) × 6.0 mg/dL = 5.0 mg/dL. The blood then has a glucose concentration of 30 × 5.0 mg/dL = 150 mg/dL. Which of the following oxidative transformations is unlikely to occur? A. A primary alcohol to an aldehyde B. A tertiary alcohol to a ketone C. An aldehyde to a carboxylic acid D. A secondary alcohol to a ketone - ANSWER B. A tertiary alcohol to a ketone