Chemistry
AA6666
2020CHEM1001HW3-RefrigerantGasesandtheOzoneLayer.docxNAME: ______________________________________________ LAB SECTION: _____________
NAME: Wenjia Zhang
HOMEWORK #3
REFRIGERANT GASES and THE OZONE LAYER
Follow the instructions to fill in this table.
A. Lewis structures (2 points) Draw the Lewis structures for each chemical in the next section. Use what you learned in Homework #2 to draw your Lewis structures correctly. The structural formulas tell you how the atoms are connected. For example:
B. Category (1 point) Label each chemical as a CFC, HCFC, HFC, HFO, or halon in the top right box.
C. Ozone-depleting potential (0.5 point) Rank each chemical based on its ozone-depleting potential. Use the same ideas that we covered in Lecture 9 and assign each chemical a score of 0, 1, or 2.
|
Score |
0 |
1 |
2 |
|
Meaning |
This chemical does not destroy the ozone layer |
This chemical causes only moderate damage to the ozone layer |
This chemical is very harmful to the ozone layer |
D. Ozone-destroying product formed in the stratosphere (0.5 point) If the chemical does destroy ozone, what part of the molecule is responsible for the ozone destruction? The options are Cl atoms, Br atoms, or none.
Note: Everyone gets +1 free point, so the total points add up to 25!
1.
2.
3.
4.
5.
6.
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Fall 2020 – CHEM 1001 – Homework #3 |
Page 1 of 1 |
molecular formula = C2H3F3 structural formula = CH3CF3
CFC, HCFC, HFC, HFO, or halon?
ozone-depleting potential (0, 1, or 2)
ozone-destroying product (Cl, Br, or none)
molecular formula = C2HCl2F3 structural formula = CCl2FCHF2
CFC, HCFC, HFC, HFO, or halon?
ozone-depleting potential (0, 1, or 2)
ozone-destroying product (Cl, Br, or none)
molecular formula = C3H2F4 structural formula = CHFCHCF3
CFC, HCFC, HFC, HFO, or halon?
ozone-depleting potential (0, 1, or 2)
ozone-destroying product (Cl, Br, or none)
molecular formula = C2Br2F4 structural formula = CBrF2CBrF2
CFC, HCFC, HFC, HFO, or halon?
ozone-depleting potential (0, 1, or 2)
ozone-destroying product (Cl, Br, or none)
H C
H
C C
H
F F
CH2FCHFCH3
The non-C atoms to the right of each C tell you which atoms are connected to that carbon
C atoms structural formula: Lewis structure:
H
H
H
H C
H
C C
O
H H
CH3CH(OH)CH3
the "CH(OH)" in the structural formula tells us that the H and the OH are both connected to the middle C
C atoms H
H
H
H structural formula: Lewis structure:
molecular formula = C2Cl5F structural formula = CCl3CCl2F
CFC, HCFC, HFC, HFO, or halon?
ozone-depleting potential (0, 1, or 2)
ozone-destroying product (Cl, Br, or none)
