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(CHEM001)[2010](f)quiz~zzheng^_10041.pdf
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CHEM001 Introductory Chemistry, Fall 2010 Quiz Solutions
Section I. Multiple Choices Questions (8X3 pts)
1.
A

2.
A

3.
A

4.
A

5.
C

6.
B

7.
B

8.
D


Section II. Short Questions
1. (6X2 pts)
a.
chemical changes

b.
physical changes

c.
physical changes

d.
physical changes

e.
chemical changes

f.
physical changes


2. (6X2 pts)
a.
heterogeneous mixture

b.
element

c.
compound

d.
homogeneous mixture (solution)

e.
heterogeneous mixture

f.
element


3. (1) 3 g C is allowed to react with 8 g O2, so 12 g C reacts with 32 g O2 to form 44g CO2 (4pts).
(2)
As a result, oxygen will remain, mass is equal to 110 g C 32 g= 78 g (4pts).

(3)
These results are consistent with the law of definite proportions (the law of constant composition) (3pts).

b.
SiF4


4. (4X4 pts)
Phosphorus (P, Z=15) 1s22s22p63s23p3
Magnesium (Mg, Z=12) 1s22s22p63s2
Nitrogen (N, Z=7) 1s22s22p3
Copper (Cu, Z=29) 1s22s22p63s23p63d104s1
5. (3X5 pts)
a. NH3



c. NO2+

6. (2X5 pts) a)CH4 : Lewis structure:

Parent structure: tetrahedron


Shape: tetrahedron
b) PCl3 : Lewis structure:

Parent structure: tetrahedron


Shape:
Trigonal pyramidal