Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
What are the two sources trace constituents come from? |
Natural: Oceans, volcano, vegetation
Anthropogenic: Human source |
|
|
What are the two removal processes? |
Dry deposition: Lost to the Earth's Surface Wet deposition: earth's surface to aqueous form. |
|
|
How does wet deposition occurs? |
Gas condense in a droplet: droplet act as condensation nuclei Particle collides with the wet particle and so on |
|
|
How many oxidation states can Sulfur exist in? what are they? |
5 -2, -1, 0, +4, +6 |
|
|
When is sulfur the most reactive? why? |
It is the most reactive the less oxidized it is ( -2 = very reactive) The troposphere is a highly oxidizing environment. |
|
|
What is the most dominant sulfide compound in the atmosphere and where does it come from? |
Dimethyl Sulfide, it comes from phytoplankton |
|
|
carbonyl sulfide has a valance of (-2), does it have high or low activity? |
Despite being poorely oxidized, it has low reactivity because of the high stability of the compound. |
|
|
Where does sulfur dioxide comes from ? |
Mainly from pollution but also volcano |
|
|
What is the Laughing gas and where does it come from? |
Nitrous oxide, produced by biological sources |
|
|
What gas is mostly produced by fossil fuels |
Nitrogen oxides |
|
|
Where does Ammonia comes from? |
Animal waste |
|
|
What is Nitrogen fixation? |
Conversion of N2 to a form that can be utilized by organisms; eg; amonia. |
|
|
What is denitrification? |
Reduction of NO3- by bacteria to N2, No2 N2O of NO |
|
|
What is the most abundant hydrocarbon in the atmosphere? |
Methane |
|
|
Volatile organic compounds have generally high vapour pressures, what does this means regarding their presence in the atmosphere and boiling point ? |
They will have a high boiling point and will be more present in the atmosphere |
|
|
How is carbon monoxide produced? |
By combustion or oxidation of methane |
|
|
What is the main anthropogenic source of carbon dioxide? |
Burning fossil fuels |
|
|
Why do chlorofluorohydrocarbons have typically a very long life spam ? |
They have a typical removal process that is ineffective. |
|
|
Which layers of the atmosphere cane ozone be found? |
in the troposphere or stratosphere |
|
|
What is the main role of aerosols in the atmosphere? |
Cloud condensation nuclei |
|
|
Typically how many classes of aerosols are there and how are they classified? |
3 and they are classified by size |
|
|
What are the rules to follow to find out the lewis structures? |
1: determine the number of pairs 2: try structure 3: formal charge |
