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.

Match each molecular formula with the correct molecular geometry.  Some answers may be used more than once, some may not be used.

A unit uses brine (a saturated salt (NaCl) solution) in an extraction purification of crude product coming from a reactor.  The brine storage tank has a full capacity of [totalm] lbs.  If the brine solution is [percent]% m/m (mass percent), how much NaCl is in the tank when full?  Give your answer in lbs (no units, just the number) 

A winch driven by a gasoline engine is used to lift a piece of heavy equipment onto a platform, doing [w] Btu of work on the equipment.  If the engine used [g] gallons of gasoline, with an energy content of [b] Btu per gallon, how much energy was lost to heat?  Give your answer in Btu, but do not include units in your answer.

A reactor requires [b] Btu to raise its temperature from [ti] °C to [tf] °C.  What is the heat capacity of the reactor?  Express your answer in Btu/°C, but do not include units in your answer.

A team of engineers and operators are bringing an alkylating unit into production for the first time.  The reaction converts toluene to propylbenzene by reacting it with ethylene according to the following reaction: toluene2propylbenzene.png After reacting, the product is piped over to a distillation unit, and the distilled product is stored in a storage tank.  If the team converts [t] pounds of toluene to product and collects [p] pounds of propylbenzene in the storage tank, what was the percent yield of the process?  You do not need to include a percent sign in your answer, just the number. (Hint:  the molecular weights of toluene and propylbenzene are given in the picture describing the reaction.  If you are clever about it, you don’t need any more information or to do any stoichiometry to find the answer.  You can still solve it with stoichiometery, but it will take a bit longer…)  

Match each conversion with the correct mathematical operation.  Some answers may be used more than once, some may not be used.

The outer shell of an atom is known as its 1) ________________ shell.

Calculate the energy required to heat [w] grams of water by 15°C.  Give your answer in Joules (units not required in the answer.)  The specific heat of water is 4.184 J / (g • °C).

Fill in the blanks of the following passage with the best answers.  Some answers may be used more than once, some may not be used. 1)______________________ is a type of experiment or study for measuring heat flow.  There are a number of kinds of instruments for such experiments.  Perhaps one of the simplest is the 2)_______________________, which uses a well-insulated styrofoam cup filled with a known quantity of water, covered with an insulated lid, and a thermometer to measure the temperature of the water.  A more complex (and expensive!) setup, known as a 3)______________________ uses a very strong steel chamber with a triggering device to initiate the process being studied, which is immersed in a water bath with a thermometer to measure temperature changes.  Both operate on essentially the same principle — the process heats (or cools) the water, causing a temperature change.  The measured temperature change, along with the known 4)____________________ of the instrument, allows for calculation of the energy absorbed (or released) by the water, which is equal to the energy released (or absorbed) by the system under study.