R-407c is an azeotropic blend.

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Prepare for the SkillCat EPA Type 2 Test with interactive flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready to pass your exam!

Multiple Choice

R-407c is an azeotropic blend.

Explanation:
An azeotrope boils at a single temperature at a given pressure and the liquid and vapor have the same composition, so it behaves like a pure substance. R-407C is not one of those; it’s a zeotropic blend (a mix of R-32, R-125, and R-134a). In a zeotropic blend, each component has its own boiling point, so during evaporation or condensation the vapor and liquid compositions shift and the boiling point changes with time—the result is a temperature glide rather than a fixed boil. Because of that, R-407C is not an azeotropic blend, making the statement false.

An azeotrope boils at a single temperature at a given pressure and the liquid and vapor have the same composition, so it behaves like a pure substance. R-407C is not one of those; it’s a zeotropic blend (a mix of R-32, R-125, and R-134a). In a zeotropic blend, each component has its own boiling point, so during evaporation or condensation the vapor and liquid compositions shift and the boiling point changes with time—the result is a temperature glide rather than a fixed boil. Because of that, R-407C is not an azeotropic blend, making the statement false.

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