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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

1)

2)

Sunscreen ­ how does it work?…

Page 2

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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

(i)

(ii)

(iii)

(iv) Electronic transition…

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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

Description:

Products:

Common for:

Example:

Type 2: Homolytic Fission

Description:

Products:

Common for:

Example:

Ozone formation in the troposphere

Task) Describe what is…

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Radical Chain Reactions

Name of key stage Description of the key An example in the What is formed
stage reaction
















Lesson 7 ­ OZ4 ­ Ozone: Here today gone tomorrow

Steady State is when

Rate refers to

Measuring rate of reaction

Rates can be calculated using the following equation



Method…

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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)













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Intensity of Dissociation of oxygen molecules happens faster when the intensity of the
Radiation radiation increases because more bonds are absorbing energy per second so
more bonds get broken



The effect of temperature on rate

General rule:



MaxwellBoltzmann distribution curve

MaxwellBoltzmann distribution curve at MaxwellBoltzmann distribution curve showing
different temperatures…

Page 7

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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







Haloalkanes

Draw a haloalakane and label the bond polarities using dipoles







Full Structural Skeletal Formula Name Why is this name
Formula…

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1,2dichlorinepropane




1chloro3bromobuta
ne






Electronegativity

Definition:





State two trends in electronegativity

1.

2.





Boiling points of haloalkanes

Boiling points increases because of two factors

1.

2.



Dipoles

There are three different types of dipoles

1.
2.
3.

Permanent Dipoles


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Instantaneous Dipoles







Induced Dipoles







Intermolecular bonds

There are three different types of intermolecular bonds

1.
2.
3.

Instantaneous dipoleinduced dipole bonds





Permanent dipolepermanent dipole









Permanent dipoleinduced dipole bonds






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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…

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