The gas used in a refrigerator to cool water is___________?
Correct answer: D. Tetrafluoroethane
- A. Nitrogen
- B. Carbon dioxide
- C. Methane
- D. Tetrafluoroethane
Explanation
Tetrafluoroethane is a refrigerant used in many modern refrigerators and air-conditioning systems because it absorbs heat during evaporation. Nitrogen, carbon dioxide and methane are not the usual answer for this appliance.
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Chemical principles appear in acids, bases, salts, solutions, oxidation, combustion, corrosion and neutralisation, along with the composition and uses of common substances. Coverage includes soaps and detergents, fertilizers, medicines, food preservatives, polymers, fuels and water treatment, while distinguishing physical changes from chemical reactions.
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