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The pH Value Is Right

Which set of 1 Molar solutions has the correct pH values?


A. Water pH = 0; hydrochloric acid pH = 4; acetic acid pH = 7; ammonia solution pH = 10; sodium hydroxide solution pH = 14.

B. Acetic acid pH = 0; hydrochloric acid pH = 4; water pH = 7; sodium hydroxide solution pH = 10; ammonia solution pH = 14.

C. Sodium hydroxide solution pH = 0; ammonia solution pH = 4; water pH = 7; acetic acid pH = 10; hydrochloric acid pH = 14.

D. Hydrochloric acid pH = 0; acetic acid pH = 4; water pH = 7; ammonia solution pH = 10; sodium hydroxide solution pH = 14.

To see the answer to today’s question, visit the following link:
http://mcatquestionoftheday.com/chemistry/the-ph-value-is-right/

Genetic Drift Effects

Genetic drift is the process responsible for:


A. gaining a new allele within large populations.

B. gaining a new allele within sufficiently small populations.

C. losing an existing allele due to emigration.

D. losing an existing allele due to random sampling.

To see the solution, visit the following link:
http://mcatquestionoftheday.com/biology/genetic-drift-effects/

Rates of Consumption

During the reaction to form ammonia from nitrogen and hydrogen according to the reaction: N2(g) + 3 H2(g) <-> 2 NH3(g), ammonia was being produced at the rate of 1.50 mol.L-1.s-1. What were the respective rates of consumption of nitrogen and hydrogen at this time?


A. N2(g) 1.50 and H2(g) 1.50 mol.L-1.s-1.

B. N2(g) 2.25 and H2(g) 0.75 mol.L-1.s-1.

C. N2(g) 0.75 and H2(g) 2.25 mol.L-1.s-1.

D. N2(g) 3.00 and H2(g) 1.00 mol.L-1.s-1.

To see the answer to today’s question, visit the following link:
http://mcatquestionoftheday.com/chemistry/rates-of-consumption/

HNMR Identification

In proton NMR spectroscopy, which compounds or functional groups show a characteristic peak in the range 9-10 ppm?


A. halogenated alkanes.

B. aldehydes.

C. alcohols.

D. aromatic compounds.

To see the solution, visit the following link:
http://mcatquestionoftheday.com/chemistry/hnmr-identification/

Excess Reagent

Which of the following is the correct way to dispose of excess reagent?


A. Add the excess back into the reaction.

B. Return excess to the stock bottle.

C. Flush down the sink with lots of water.

D. Dispose in the liquid waste container.

To see the answer to today’s question, visit the following link:
http://mcatquestionoftheday.com/chemistry/excess-reagent/

Mar 3

Conversion of Threonine

(Source: mcatquestionoftheday.com)