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character: Freon
topic: Alternatives to CFCs in Refrigeration and Air Conditioning
grade: 11
subject: Chemistry
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character: HFOs
topic: Hydrofluoroolefins as a replacement for CFCs
grade: 11
subject: Chemistry
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character: Ammonia
topic: Use of Ammonia in Refrigeration Systems
grade: 11
subject: Chemistry
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character: CO2
topic: Carbon Dioxide as a Refrigerant
grade: 11
subject: Chemistry
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