What is the major problem with the U.S. customary system? It does not allow conversion to metric units. It is out of date. It avoids cumbersome conversions of units. Understanding the units does not require knowing English. It has many different unfamiliar units and conversions are difficult.

In the following catalyzed gas phase equilibrium, what is the effect on the direction of the reaction if the pressure on the reaction mixture is decreased? 2SO2(g)  +  O2(g)  ⥦  2SO3(g)

What is the radioactive particle released in the following nuclear equation?   159W →  155Hf  + ____

Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 A.M. on Monday, how many mg remain at 10:00 A.M. on the following day?

Which of the following statements best describes the state of equilibrium of a reaction?

Among the following weak acids, which one is the strongest?

Sodium carbonate gives an acidic solution when dissolved in water.

Rubbing alcohol is 70.0% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container?

When 200 mL of water are added to 100 mL of 12% CaCl2 solution, the final concentration of CaCl2 is?

A balloon occupies a volume of 1.25 L at sea level.  What volume would the balloon occupy at the Mount Everest (altitude 29,000 ft) where the air pressure is only 253 mmHg. Assume no change in Temperature.