Context: Roughly one quarter of all zinc output in the United States (2009), is consumed in the form of zinc compounds; a variety of which are used industrially. Zinc oxide is widely used as a white pigment in paints, and as a catalyst in the manufacture of rubber. It is also used as a heat disperser for the rubber and acts to protect its polymers from ultraviolet radiation (the same UV protection is conferred to plastics containing zinc oxide). The semiconductor properties of zinc oxide make it useful in varistors and photocopying products. The zinc zinc-oxide cycle is a two step thermochemical process based on zinc and zinc oxide for hydrogen production.

Question: In what form is 1/4 of zinc used in the US?
Answer: zinc compounds

Question: What kind of zinc compound is used in manufacturing rubber?
Answer: Zinc oxide

Question: What protects the polymers in rubber from ultraviolet radiation?
Answer: Zinc oxide

Question: Why is zinc oxide useful in photocopying products?
Answer: semiconductor

Question: What kind of process is the zinc zinc-oxide cycle?
Answer: thermochemical

Question: What form is 1/4 of zinc used in the Ukraine?
Answer: Unanswerable

Question: What kind of zinc compound is used in melting rubber?
Answer: Unanswerable

Question: What protects the polymers in rubber from nuclear radiation?
Answer: Unanswerable

Question: Why is zinc oxide unhelpful in photocopying products?
Answer: Unanswerable

Question: What kind of process is the zinc zinc-dioxide cycle?
Answer: Unanswerable