CHM114, fall 2008
Study guide and sample exam
Exam 3 (chapters 9 through 13)
The questions included the exam will be based both on the end-of-chapter exercises from the textbook
and MasteringChemistry online homeworks. There will be questions of three levels of difficulty – easy,
moderate and challenging. Easy and moderate questions constitute ~ 45% and 45% of all questions
correspondingly. Easy questions ask only for the chapter they belong to. Moderate questions needs more
thinking and/or knowledge of the past chapters. Challenging questions are for those who aim to A-,A,A+.
Challenging questions constitute ~ 10% of all questions. Challenging questions needs deeper thinking and
suppose that student reads and understands the textbook at least a little beyond the lecture notes. There will
be totally 25 questions. You are given 1 academic hour (50 min) to answer them. Periodic table will be
supplied. If additional conversion factors or fundamental constants will be needed, they will be supplied as
well. What will be tested is the knowledge of basic concepts and formulas as well as skills of how to use
them. There will be no questions about history of science (although this kind of knowledge is encouraged).
In this guide, wherever it is relevant, the reference to the textbook page number is given. Reading the
indicated page only may not be enough. To succeed for 100% the whole chapter must be read.
Lecture notes (in *.ppt format) posted on the Blackboard contain the most needed information, but not
the all 100% that you may need to answer the exam question with 100% score.
In the sample questions below the correct answer is indicated by the “***”.
Unanswered question counts for zero points.
On the exam, please, remember to:
write you name on this answer sheet,
mark your answers on the answer sheet,
write and bubble your last and first name on scantron of corresponding color code,
bubble your answers on scantron.
Chapter 9. Molecular Geometry and Bonding Theories.
To demonstrate the knowledge of the names of basic 3D shapes of the molecular geometry (
trigonal planar, tetrahedral, trigonal bipyramidal and octahedral
) as well as derivatives from them
trigonal pyramidal, bent, seesaw, T-shaped, square planar, square pyramidal
) and the ability to
recognize them on the drawing (p.343).
To remember roughly the angles for the basic types of geometry (
180° for linear, 120° for trigonal,
109.5° for tetrahedral
To understand the idea of electron domains (AKA “charge clouds”) and to remember that they
from each other
arranging themselves in the most energetically favorable geometry (p.345).
To understand the difference between the electron domain geometry and molecular geometry: the
molecular geometry description
ignores lone pairs
and accounts only the bonds.
To be able to reconstruct the electron domain geometry and molecular geometry from the molecular