Dr. Casey
Exam 1
Spring 2003
Chem. 104
Name: ______________________
Signature: ______________________
Honor Statement: By signing this exam, you indicate that you have neither given nor
received aid from any unauthorized source.
Answer each question in the space provided. If you need more space, use the back of the
sheet. All work must be shown to receive partial credit. You have until the regularly
scheduled end of class to complete the exam. Good luck!
1. State the number of protons, neutrons and electrons in the following isotopes:
a.
108
47
b.
47
Ag
Ti
2. Write the symbol of the elements having the following composition. If the element has an
overall charge, include it with the symbol (e.g. Xn+).
a. 42 neutrons, 33 protons, 36 electrons
b. 21 neutrons, 20 protons, 18 electrons
3. Describe each type of bond in terms of the following
how electrons are involved in the bond
the general classes of elements that participate in each type of bonding
a. ionic
b. covalent
c. polar covalent
4. Match the following terms with their definitions (only 1 term per definition).
electron
neutron
proton
nucleus
isotope
polar covalent
ion
anion
cation
electrode
oxidation
reduction
ionic
covalent
alkaline metal
transition metal
halogen
noble gas
semimetal
alkaline earth metal
a. an atom or group of atoms with a positive charge
______________
b. a bond resulting from the unequal sharing of electrons
______________
c. elements that generally form +2 ions according to the octet rule ______________
d. an atom that differs from another atom only by the number of
neutrons
______________
e. elements that are very unreactive
______________
f. the subatomic particle with the smallest mass
______________
g. a group of elements in which the charge of the ions can vary
______________
5. Fill in Polar or Nonpolar for each of the following:
a. A molecule that does not dissolve in octanol
(CH3CH2CH2CH2CH2CH2CH2CH2-OH)
__________
b. A molecule that has a large degree of charge separation
__________
c. A molecule that is highly attracted to its neighbors
__________
d. A molecule that is soluble in water
__________
e. A molecule that has a high volatility
__________
6. A lake has been contaminated with the chemical shown below. What polarity does the
molecule have? Why? Which environmental compartments in the lake will this chemical enter?
Justify your answer.
7. Fill in the missing information for each of the following molecules.
O
H
a. Name all
Intermolecular Forces
b. Solubility in water
(high or low)
c. Solubility in fat
(high or low)
d. Degree of partitioning into
sediments
(high or low)
8. Write names or formulas for the following molecules:
a. PF5
d. nickel (II) sulfate
b. MgCl2
e. dinitrogen tetroxide
c. Cr2O3
f. lithium sulfide
9. Which of the following properties are present in chemicals that have been found to
biomagnify substantially? (circle all that apply)
a. weak acids
b. nonpolar
c. fat-soluble
d. polar
e. water-soluble
f. contain chlorines
g. contain –OH groups
h. short-lived in the environment
10. Alcohols are molecules with a hydrocarbon tail and an –OH group. Explain why some
alcohols are miscible in water and some are not.
Miscible in Water
O
O
O
Not Miscible in Water
H
O
H
O
H
O
H
H
H
11. Which of the following molecules is most likely to bioaccumulate? Justify your answer in
terms of the composition of the molecule and the Kow values that are provided.
Cl
Cl
Cl
O
Cl
Cl
Kow = 1,584,000
H
Kow = 29