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(chem001)[2010](f)quiz~3224^_10042.pdf
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CHEM001 Introductory Chemistry, Fall 2010
Assignment 01


Due: Noon, Wed, Sep 29, 2010
Please turn in the homework in class or to Rm4543 before the due date. Late homework assignments will not be accepted.
Name:
Student ID:


Section I. Multiple Choices Questions (24 pts, 3 pts each question)
1. 32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. If 32 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of the material in the container after the reaction is completed?
A. 32 g
B. 80 g
C. 100 g
D. 132 g
2. The amount of aluminum on the earth today relative to the amount 100 years ago when Al was first commercially extracted from bauxite, a aluminum containing ore,
A. is essentially the same
B. is decreasing rapidly due to production of aluminum beverage container
C. is decreasing, but more slowly recently due to interest in recycling
D. is actually increasing due to recycling efforts and more energy efficient production methods
3. A cation is a
A. negatively charged ion
B. positively charged ion
C. negative electrode
D. positive electrode
4. The isotope of carbon commonly referred to as carbon-14 is
A.


B.



C.
D.
5. The maximum number of electrons that may reside in the n=2 energy level is
A. 2
B. 3
C. 8
D. 18
6. The inertness of the noble gases is due to
A. the unique structure of their nuclei
B. the special number of protons and neutrons
C. the bonds they form with other elements
D. the number and arrangement of their electrons
7. Acetylene is used in high temperature metal cutting torches. The formula of acetylene is C2H2. The structure of acetylene is
A. H-C-C-H
B. H-C=C-H
C. H-CC-H
D. C-HH-C
8. The best description of the shape of an ammonia molecule is
A. Linear
B. Bent
C. Pyramidal
D. Tetrahedral

Section II. Short Questions
1. Check whether the following processes are physical changes or chemical changes: (6 pts, 1pt each question)
a.
Soda (sodium bicarbonate) removes the foul odor in a refrigerator

b.
Fogging of glasses when entering an air-conditioned room

c.
Bronze status turns green over time

d.
Appearance of rainbow after a thunderstorm

e.
Moth balls gradually sublimating in a closet.

f.
Hydrofluoric acid attacks glass, and is used to etch calibration marks on glass laboratory utensils.


2. Classify the following as either an element, compound, heterogeneous mixture, or a homogenous mixture (solution): (16 pts, 2pt each question)
a.
Air

b.
Gold

c.
Blood

d.
Water

e.
Table salt (NaCl)

f.
Ozone (O3)

g.
Chicken noodle soup

h.
Beer


3. a) What is the Law of Multiple Proportions? Give one example of it. (4 pts)
b) If Iron (Fe) combines with oxygen to give FeO (i.e. each iron atom combines with one oxygen atom), what is the mass ratio of Fe to