Match each reactant and product in the following reaction equation to the correct coefficient so that the equation balances.  Some coefficients may be used more than once, some not at all. ____ C4H10 + ____ O2 –> ____ CO2 + ____ H2O

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!

A certain railcar can hold up to [v] gallons of material.  An operator would like to load this railcar with material A, which has a density of [d] lbs/gal.  How many pounds of material A will the railcar be able to hold?  Be sure to express your answer to the correct number of significant digits.

A(n) _____________________ mixture would be expected to show uniform composition regardless of the position or volume of material sampled, a(n) _____________________ mixture would be expected to show varying composition depending on how and where it was sampled.

________________________ states that an atom is stabilized by having its highest occupied (valence) energy level filled.

Which subatomic particle — descriptor pairs are accurate?  Choose all that apply.

Which elements are paired with the correct number of valence electrons?  Choose all that apply.

This oblique sonogram of the fetal abdomen most likely demonstrates:   

A patient presents for an ultrasound to determine gestational age. An image of this early second-trimester fetus is most suspicious for: 

Peritoneal calcifications with associated dilated loops of bowel and polyhydramnios visualized in a 30-week fetus most likely represent: