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In polymer chemistry, branching occurs by the replacement of a substituent, e.g., a hydrogen atom, on a monomer subunit, by another covalently bonded chain of that polymer; or, in the case of a graft copolymer, by a chain of another type. In crosslinking rubber by vulcanization,
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Answers:Well, they all involve one another but: 1.a 2.b 3.c 4.d 5.f 6.e So I would agree, but physical chemistry is also arguable air pollution as well due to reactive rates of ozone depletion.
Answers:You'll never get a perfect answer to this question but I'll give it a try: If you HAD to choose 5 branches to be "main" ... the first five you mentioned are probably the best. This is because out of every way you could possibly categorize the branches, these branches overlap with each other the LEAST, yet they are all relatively similar in size. Theoretical chemistry doesn't fall in that list because it's a different type of categorization. The first group is categorizing based on information content, while the distinction between theoretical and experimental chemistry deals with the techniques used. There's theoretical physical chemistry, theoretical analytical chemistry, theoretical biochemistry, and so on. And there's experimental physical, experimental biochemistry, etc.. Also, distinguishing btwn materials and nuclear chemistry is distinguishing based on what you're doing the chemistry ON, while the distinction between physical and analytical is more fundamental. Because of this, biochemistry should be taken out of your list of 5 main (there should only really be 4 main .... biochemistry is just chemistry of molecules that occur in living organisms, it could be physical or analytical too). Usually you can call yourself a chemist after 4 years of undergraduate education. Some people can finish their degree even faster.
Answers:This question saddens me. it is an attempt to put things into boxes that don't really fit in boxes. Photochemistry, for example, is based on spectroscopy (physical) but is used to study the reactions of both organic and inorganic systems, and photosynthesis which is a special case of photochemistry links directly to biochemistry. I actually feel very strongly that the question you have been given is anti-educational. I accept e-mail, and will be happy to explain this to your teachers, and to disclose to them the qualifications I have that makes me entitled to say this. I don't think this is what you wanted to hear, but it's how it is.
Answers:1. Physical 2. Organic 3. Biochemistry