Fill in the blanks with the correct term or value:

1. HDPE is made using _______ catalyst (TiCl4 + Al(C2H5)3) at _______ pressure.
2. LDPE is made at _______ to _______ atm using a _______ initiator.
3. Nylon-6,6 has _______ monomers, each with _______ carbon atoms.
4. The monomer for Nylon-6 is _______, which undergoes _______-opening polymerization.
5. Dacron (PET) is a poly_______, formed from _______ glycol + _______ acid.
6. Bakelite is thermosetting because it has extensive covalent – cross-links.
7. Natural rubber = _______-1,4-polyisoprene; gutta-percha = _______-1,4-polyisoprene.
8. Vulcanization involves heating rubber with _______ to form – cross-links.
9. Normal rain pH = _______; acid rain pH = below _______.
10. Acid rain is caused by _______ and _______ dissolving in water to form H2SO4 and HNO3.
11. Ozone-depleting radical is ; one such radical can destroy ~ O3 molecules.
12. BOD of clean water is less than _______ ppm; heavily polluted water has BOD > _______ ppm.
13. Eutrophication is caused by excess _______ and _______ nutrients.
14. Mercury (Hg) causes _______ disease; cadmium (Cd) causes _______ disease.
15. Greenhouse gases include: CO2, _______, _______, CFCs, and _______.
16. PAN stands for _______ and is a component of _______ smog.
17. London smog is _______ in nature; photochemical smog is _______ in nature.
18. Buna-S is a copolymer of _______ and _______; Buna-N is a copolymer of _______ and _______.
19. PHBV is a _______ polymer used in _______ and medical devices.
20. The SMILES for tetrafluoroethene (Teflon monomer) is _______.
21. The Carothers equation is: Xn = _______.
22. In photochemical smog, UV light splits _______ to give _______ + O•, which reacts with O2 to form _______.
23. Melamine-formaldehyde resin is used for unbreakable _______.
24. The SMILES for caprolactam is _______.
25. Atom economy for an addition reaction is always _______%.

Answers:

1. Ziegler-Natta; low. 2. 1000; 2000; free radical. 3. Two; 6. 4. Caprolactam; ring. 5. ester; ethylene; terephthalic. 6. C; C. 7. cis; trans. 8. sulfur; S; S. 9. 5.6; 5.6. 10. SO2; NOx. 11. Cl•; 100,000. 12. 5; 17. 13. nitrogen (N); phosphorus (P). 14. Minamata; Itai-Itai. 15. CH4; N2O; water vapor (H2O). 16. peroxyacetyl nitrate; photochemical. 17. reducing; oxidizing. 18. butadiene; styrene; butadiene; acrylonitrile. 19. biodegradable; packaging. 20. FC(F)=C(F)F. 21. $\frac{1}{1–p}$. 22. NO2; NO; O3. 23. crockery. 24. O=C1CCCCCN1. 25. 100.