Practice Test Geeks(CFC) Chlorofluorocarbon Certification Practice Test
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Chlorofluorocarbon Properties & Environmental Impact Flashcards

7 cards from real CFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Polar stratospheric clouds (PSCs) accelerate ozone depletion over Antarctica primarily by:

    Answer: Providing surfaces for heterogeneous chemical reactions that activate chlorine

    PSC ice crystal surfaces catalyze reactions that convert reservoir chlorine compounds (like HCl and ClONO₂) into active Cl₂ gas, which rapidly destroys ozone when spring sunlight arrives.

  2. The term 'ozone hole' technically refers to:

    Answer: A region where stratospheric ozone falls below 220 Dobson Units

    Scientists define the Antarctic ozone hole as the region where total column ozone drops below 220 Dobson Units (DU), which is substantially lower than the pre-depletion baseline of ~300 DU.

  3. R-113 (CFC-113) was primarily used as a(n):

    Answer: Solvent for cleaning electronic circuit boards

    CFC-113 (trichlorotrifluoroethane) was extensively used as a precision cleaning solvent in electronics manufacturing due to its excellent solvency and non-flammability.

  4. What does a Dobson Unit (DU) measure in relation to ozone?

    Answer: The total column amount of ozone compressed to standard temperature and pressure

    One Dobson Unit represents a layer of pure ozone 0.01 mm thick at standard temperature and pressure; the total atmospheric ozone column is measured by summing ozone at all altitudes.

  5. Which international agreement strengthened the Montreal Protocol by accelerating CFC phase-out schedules for developed nations?

    Answer: Copenhagen Amendment (1992)

    The Copenhagen Amendment of 1992 significantly accelerated CFC phase-out deadlines, moving the complete production ban in developed countries from 2000 to January 1, 1996.

  6. What is the approximate ODP of HCFC-22 (R-22) compared to CFC-11's reference value of 1.0?

    Answer: 0.055

    R-22 has an ODP of approximately 0.055, roughly 18 times less damaging than CFC-11, due to its hydrogen atom enabling tropospheric degradation before much of it reaches the stratosphere.

  7. Which health effect is most directly linked to increased UV-B radiation resulting from stratospheric ozone depletion?

    Answer: Increased rates of melanoma and non-melanoma skin cancers

    UV-B radiation is strongly linked to both melanoma and non-melanoma skin cancers; each 1% decrease in stratospheric ozone is estimated to increase UV-B by about 2% and skin cancer rates by roughly 2-4%.