9.1-9.2 Stratospheric Ozone Depletion

According to the diagram of stratospheric ozone, which of the following is true?

• Stratospheric ozone absorbs all of the UVA radiation that hits Earth's atmosphere.

• Stratospheric ozone absorbs all of the UVB radiation that hits Earth's atmosphere.

• Stratospheric ozone absorbs most of the UVB and all of the UVC radiation that hits Earth's atmosphere.

• Stratospheric ozone absorbs UV radiation equally.

In humans, prolonged exposure to UVB and UVC can cause all of the following EXCEPT--

• significant tissue damage

• asthma and COPD

• skin cancer

• cataracts in the eyes

Which of the following is NOT true about tropospheric ozone?

• Tropospheric ozone is a respiratory irritant.

• Tropospheric ozone damages plant tissues and reduces photosynthesis.

• Tropospheric ozone can cause skin cancer and cataracts.

• Tropospheric ozone is a precursor to photochemical smog.

Ozone forms in the stratosphere when UVC breaks O₂ molecules into free oxygen atoms, then a free oxygen atom combines with an O₂ molecule.

• True

• False

Stratospheric ozone can be broken when UVC breaks O₃ into O₂ and a free oxygen atom, which can then bond to another free oxygen atom to form an O₂ molecule.

• True

• False

Tropospheric ozone is different from stratospheric ozone in its chemical structure.

• True

• False

Which of the following is a primary anthropogenic source of stratospheric ozone depletion?

• NO₂

• CFCs

• CH₄

• SO₂

Chlorine atoms are persistent in the stratosphere. What does this mean?

• A chlorine atoms can remain the stratosphere for a long time (for 50 - 100 years).

• A single chlorine atoms can destroy up to 100,000 ozone molecules for its duration in the stratosphere.

• A chlorine atom can break down UVC radiation.

• A chlorine atom can combine a stable molecule with methane.

Polar stratospheric clouds form in temps that are

• very very cold

• very warm

What was the global agreement to phase out the use of CFCs called?

• Kyoto Protocol

• CITES agreement

• Montreal Protocol