Air normally contains 20.95 mole % oxygen, with most of the remainder made up of nitrogen.  If the current pressure and temperature are [p] mmHg and [t] °C, respectively, what is the current partial pressure of oxygen?  Report your answer in mmHg

Match each atom from the following Lewis structure of the nitrate ion with its correct formal charge.  Do not consider any resonance structures or resonance effects, just the structure pictured.  Some answers may be used more than once, some may not be used. nitrate_FC.png 

Complete the following passage with the best answers.  Some answers may be used more than once, some may not be used. In a(n) 1)_______________________ reaction, two aqueous solutions of soluble ionic species are combined which results in at least one pairing of ions producing an insoluble solid.  This type of reaction belongs to a larger class of reactions called 2)____________________ reactions, in which two species ‘swap’ bonding partners.  There are several ways to express such a reaction with a chemical reaction equation.  In a(n) 3)______________________ equation, the reactant and product species are written as complete formulas, with ions paired together as salts.  Subscripts of (aq) or (s) may denote whether each compound is soluble or insoluble, but otherwise, no dissociation is depicted.  This type of equation can be expanded into a 4)___________________ equation, where each soluble ion is written separately, expressing its state of being dissociated in solution, while insoluble compounds remain written as complete formulas.  In such an equation, 5)______________________ can be clearly seen, appearing both on the reactant and product side of the equation, indicating that they are not interacting with other ions or participating in the formation of the solid.  Eliminating these inactive species gives a(n) 6)________________________ where only the ions which come together to react and form the solid are shown, as well as the solid produced.

A unit is manufacturing synthetic oil and using a hydrogenator to reduce olefin content in the product.  The hydrogenator uses compressed hydrogen and a catalyst to react with any remaining olefins (alkenes) in the material to make a saturated, more stable product.  Under current operating conditions, [m] moles of hydrogen are required per ton of process material passing through the hydrogenator, and the unit produces [t] tons per hour, 24 hours per day, 7 days per week.  The hydrogenator is fed by a hydrogen storage tank holding [l] liters of hydrogen, currently at [p] psi, with the ambient temperature stable at [temp] °C.  If an operator has just come in for a seven day shift, what should he expect the pressure reading to be on the last day of his shift (seven whole days later)?  Give your numerical answer in psi. (Note:  1 atm = 14.696 psi)

A [vone] liter tank of compressed nitrogen (N2) with a pressure of [pone] psi is sitting in a warehouse at a temperature of [tone]°C.  How much volume would this nitrogen occupy if it were released to the atmosphere at [ttwo]°C?  Give your answer in liters.  (Note — 1 atm = 14.696 psi)

What is the pH of a [c] M solution of HCl?

Which of the following are depictions of resonance structures?  Choose all that apply.  Note — these structures follow skeletal structure rules, and omit explicitly labelled carbons, most hydrogens, and lone pairs of electrons.  Assume normal valences and that all structures are drawn correctly, including formal charges, and that lone pair are present if they are appropriate.

Which of the following statements show the correct ordering of osmotic pressure? (Hint:  the higher osmotic pressure solution should come first)

The three primary phases of ordinary matter are solids, liquids and gasses. 1)_____________________ are characterized by having their atoms located in fixed positions; in the 2)_______________________ phase, particles experience significant attraction to one another and are located close together, but not in fixed positions such that they can slide past one another; in the 3)__________________ phase, particles do not experience enough attraction to one another to stay together, and move independently with little interaction. Transitions between phases of matter are often possible with changes in 4)_________________. As heat energy is added, particle movement increases, and as attractive forces are overcome, solids can transition to liquids and liquids to gasses. The stronger the attractive interactions are, the more energy is required, resulting in higher 5)____________________________ points.

40 questions, multiple choice and free response.  2 hours allowed. Be sure to have a calculator, periodic table, formula sheet, and scratch paper and pencil available before starting the test.  Good luck! Unless specifically asked, do not enter units for calculated answers as part of the answer.  You will be prompted for the units that your *numerical answer* should be expressed in. In the event you need to use scientific notation to answer a question, use exponential notation, i.e., c = speed of light = 3.00 x 10^8 m/s = 3.00e8.  Planck’s constant = 6.626e-34 J/s.  However, most questions should be structured such that you can just use standard numerical expressions.