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provided in this chapter. 1. The chemical elements chlorine and fluorine are known as 2. What was the first halide refrigerant? 3. The azeotropec group of refrigerant is designated by what hundreds number? 4. True or false? To save time and money, service technicians should substitute or mix refrigerants. 5. What are the color codes for containers used for R-22, R-123, R-134a, and R-507? 6. Name some qualities that determine a good refrigerant