2019 U.S. National Chemistry Olympiad Local Section Exam Question 24

The Ksp of BaSO4 at 298 K is 1.1 × 10–10. What is ∆ at 298 K for the following reaction?

(A)  –57 kJ mol–1
(B)  –25 kJ mol–1
(C) 25 kJ mol–1
(D) 57 kJ mol–1
World History

Which of the following is considered as the world’s oldest continually used religious text?

(A) The Rig veda
(B) The Old Testament
(C) The Amhitaba
(D) The Sama veda
(E) The Analects

He ——- the practices of aggressive autograph seekers, arguing that anyone distinguished enough to merit such ——- also deserved to be treated courteously.

(A) decried . . adulation
(B) defended . . adoration
(C) endorsed . . brusqueness
(D) ignored . . effrontery
(E) vilified . . disdain

“Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.” – Thomas A. Edison


Simone bought three new pairs of shoes even though she had put herself on a tight budget just last week.

a. shoes, even though, she
b. shoes, even though she
c. shoes. Even though she
d. shoes; even though she
e. correct as is
United States History

By 1920 the United States had acquired partial or total control over all the following EXCEPT:

(A) The Monroe Doctrine
(B) The Platt Amendment
(C) The Hawaiian constitution
(D) The Hay–Bunau-Varilla Treaty
(E) The Open Door Policy

After sitting in the sink for several days, the dirty, food-encrusted dishes became ______.

a. malodorous
b. prevalent
c. imposing
d. perforated
e. emphatic

During flu season, a city medical center needs to keep a large supply of flu shots. A nurse’s aid compiles data on the number of flu shots given per day in the past few years during flu season. A cumulative probability chart of the collected data is as follows:

How many flu shots should the center store every day to meet the demand on 95 percent of the days?

(A) At most 190
(B) At most 140
(C) Exactly 170
(D) At least 150
(E) At least 200