CHEM1212 Midterm Questions and Answers Northeastern University

Name:

Indicate on the response sheet whether the statement is true (mark A) or false (mark B).
1. Ultraviolet light has higher energy than infrared.
True
False




2. Ammonia (NH3) is a strong electrolyte

True
False



3. The volume of a fixed amount of gas (at constant P) is proportional to the temperature of the gas.
True
False



4. A mole of any gaseous species occupies 22.4 L at standard temperature and 760 torr pressure. (2 marks)
True
False



5. The chemical formula for sulfate is HSO4−.

True
False

, Name:

Indicate the answer choice, on the response sheet, that best completes the statement or answers the question.
6. Nitroglycerin detonates according to the balanced reaction:

4 C3H5N3O9(l) → 12 CO2(g) + 6 N2(g) + O2(g)+ 10 H2O(g).

If 3.00 mol of nitroglycerin is detonated, how many L of carbon dioxide (assume all gases at standard temperature and
pressure) are released? (2 marks)
101 L
67.2 L
168 L
650 L




7. What is the electron configuration of selenium (Se)?
1s22s22p63s23p64s23d104p6
1s22s22p63s23p64s23d104p5
[Kr]4s23d104p4
[Ar]4s23d104p4



8. According to the valence shell electron pair repulsion theory, which molecule shape best describes the geometry of a
carbon in a double bond?
Trigonal bipyramidal
Square planar
Trigonal planar
Tetrahedral