Understanding the Ozone Layer

How does the ozone layer help the Earth? (CHOOSE 2)

• It protects us from excessive UV radiation

• It helps with temperature regulation

• It causes acid rain

• It blocks visible light

• it allows free Chlorine to escape into Space

What was the major cause for the hole in the ozone layer?

_ _ _ (HINT: 3 Capital letters)

Why were CFCs used in the first place?

• cheap and easy to mass produce

• used as a refrigerant in air conditioners, refrigerators, and was also used in aerosol cans

• during the 1930s-1970s, people didn't understand their effect on the Ozone layer

• all choices

Tags

NGSS.MS-PS1-3

Place the order of events from Oldest to Most Recent

• Oops- hole in the Ozone discovered

• Ozone hole is on its way to being closed

• CFCs being used heavily in refrigerants & aerosol cans

• Montreal Protocol enacted

• Most countries stop using CFCs altogether

Why is the Cl & O combo considered unstable?

• It is a strong bond

• It falls apart easily

• It forms a new element

• It doesn't react much

Tags

NGSS.MS-PS1-2

Why is just a little bit of CFC in the ozone layer such a problem?

• Chlorine atom breaks apart ozone and is freed to repeat the cycle over an over

• Chlorine atom disappears into the exosphere and attacks the sun

• Chlorine makes the ozone too heavy and it sinks down to the ground becoming smog

• Chlorine bullies the oxygen into becoming carbon dioxide

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Reorder the steps for how CFCs damage the ozone layer

• UV radiation breaks apart the CFC & releases a free Chlorine

• Chlorine breaks up an Ozone molecule to hook up with a free oxygen

• CFC travels up to the stratosphere

• The Chlorine is once again free to repeat the cycle

• Chlorine-oxygen combo is very unstable and breaks apart

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What was the purpose of the Montreal Protocol signed in 1987? (CHOOSE 2)

• To phase out and ban the production of CFCs

• To protect the ozone layer

• To ban all synthetic refrigerant chemicals

• To promote global warming.

• To enact International Day for Protection of the Ionosphere Layer on Sep 16 in 1994

Hydrochlorofluorocarbons (HCFCs) were one of the first replacements for CFCs. Which of the following is TRUE of HCFCs?

• broke down quicker in the troposphere

• able to be used as a coolant in refrigerators & air conditioners

• still caused some ozone depletion

• currently being phased out

• all choices

Which of the following is a benefit of using carbon dioxide condenser units?

• Depletes the ozone layer

• Contributes to global warming

• Does not deplete the ozone layer or contribute to global warming

• Not readily available

Tags

NGSS.MS-PS3-3