Ozone story exercise

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Lesson 1: OZ1: What's in the air?
ppm =
Calculating percentage composition (worked examples)
Carbon Dioxide Neon Dinitrogen oxide
Calculating concentration in parts per million (worked examples)
Nitrogen Oxygen Argon
Lesson 2: OZ2: Screening the Sun
Two Health effects of electromagnetic radiation
Sunscreen ­ how does it work? Include a sketch of oxybenzone and cinoxate in your answer
Why is the atmosphere such a good sunscreen?
Light and Electrons
The behaviour of light can be described using two different models

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Speed of light, frequency and wavelength are related by the following formula
The two theories of light can also be explained by the following relationship:
What happens when radiation interacts with matter?
When a molecule absorbs electromagnetic radiation ­ there are 4 possible outcomes
(iv) Electronic transition between energy levels also known as
Change occurring Size of energy change / J Type of radiation absorbed
If quantised why the range?
What kind of electronic changes occur when molecules absorb UV radiation?
What…read more

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Lesson 4: OZ3 How is ozone formed in the atmosphere?
There are two different types of bond fission (the breaking of a bond)
Type 1: Heterolytic Fission
Common for:
Type 2: Homolytic Fission
Common for:
Ozone formation in the troposphere
Task) Describe what is happening in each of the following reactions to explain how ozone acts as a
2 + hv O + O
O2 + O O3
O + O O2
O + O3
O3…read more

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Method 3: pH measurement
Suggest the typical apparatus used to follow changes in pH
Method 4: Colorimetry
Method 5: Chemical Analysis
Factors affecting the rate of reaction
Factor Why does the rate of reaction increase ­ relate to collision theory (collisions
per second)…read more

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Homogeneous catalysis
How do chlorine and bromine atoms delete ozone?
How do hydroxyl and nitrogen monoxide molecules delete ozone?
Lesson 11 ­ OZ6 The CFC Story
Uses of CFCs
Draw a haloalakane and label the bond polarities using dipoles
Full Structural Skeletal Formula Name Why is this name
Formula wrong?
chloropropane…read more

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State two trends in electronegativity
Boiling points of haloalkanes
Boiling points increases because of two factors
There are three different types of dipoles
3.…read more

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Instantaneous Dipoles
Induced Dipoles
Intermolecular bonds
There are three different types of intermolecular bonds
3.…read more

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Melting and boiling points of the halogens
Halogen Melting Point / K Boiling Point / K Appearance at RT
The pattern in melting point and boiling point can be explained by
Damage to the ozone layer
Give two examples of a molecule which acts as a chlorine reservoir
Lesson 13 OZ7 ­ The Ozone Hole
Why does the ozone hole develop over the poles?
Hydrogen Bonding
Three features are needed for hydrogen bonding
1.…read more


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