Study Guide for Exam #2
Chem 185 - Spring 2002
Questions on the Exam may be drawn from the following
topics.
Closed Notes Portion
These questions will be about facts noted in the
course. They will be multiple choice or fill in the blank type
questions. They will be on the front of the exam. Once you turn in
the closed notes questions you will be allowed to open your notes for
the remainder of the exam.
Chapter 6:
- Definition of valence electrons
- Know how many valence electrons an element has (p-block and
s-block in particular)
- Definition of an ion
- Tendencies of elements - which will lose electrons and which
will gain electrons
- Statement of octet rule
- Definitions of single, double and triple bonds
- What is the shape of a water molecule?
- Define electronegativity
- Trends in electronegativity - what elements are the most
electronegative ones?
- Definition of a polar versus a non-polar bond
- Definition of an electric dipole
- Definition of a vector (in class notes only)
Chapter 7:
- Identify the type of intermolecular force being described.
- Description of ion-dipole interaction
- Description of dipole-dipole interaction
- Description of hydrogen bonding interaction
- Description of induced dipole - induced dipole
- What elements are present in any case of hydrogen
bonding?
- Definition of polarizability
- Definition of solution
- Definition of solute
- Definition of solvent
- Definition of dissolving
- Definition of saturated and unsaturated solution
- Know what is present in any concentration unit
- Definition of molarity
- Concept of basic structure of soap - what are the
"parts"?
Open Notes Materials:
Questions in this section will have space for
longer answers. They will include questions that require mathematical
calculations. They also may ask for brief essay explanations of
questions. Any question assigned as part of the suggested problems
could be asked (with minor modifications as well).
Chapter 6:
- Drawing Lewis dot structures (any structure you drew in
Laboratory could be asked)
- Describe how an ionic bond forms
- Be able to predict the ion that forms from an atom - and given
a metal and a non-metal what formula would form for the ionic
compound they make.
- Covalent bonds and how they lower the energy.
- Relate the concept of taste to the shape of molecules.
- What is VSEPR theory and why does it work (what does it assume
about electrons)
- How is taste used as a science topic in elementary school
classrooms.
- Describe an experiment that can be done for taste (one was
done in the classroom)
- Describe how electronegatvity relates to bond polarity or
ionic bonding.
- Describe why water is a polar molecule
- How is polarity of a molecule observed? Describe a property or
a demonstration.
Chapter 7:
- What is the relative strength of intermolecular
interactions?
- What is an induced dipole and how is it formed by an ion or a
dipole?
- Describe how hydrogen bonding is a special case of
dipole-dipole interactions.
- How is the size of a molecule related to its induced dipole
forces?
- Calulations using molarity for solutions of sucrose or
salt.
- What factors affect solubility and how do they affect it?
- How does science factor in consumer tastes in products it
helps produce?
- How does soap work?
- What is the difference between a soap and a detergent?
- How is hardness of the water related to soaps?