Chem: Chemistry in Context (Exam 1)

*what's in the air *classifying matter *physical v. chemical reactions & properties *more about the air...

79 cards   |   Total Attempts: 182
  

Cards In This Set

Front Back
Six air pollutants
*carbon monoxide *nitrogen dioxide *ozone (when not contained in ozone layer) *sulfur dioxide *PM *lead
PM10
*dust, soot, dirt, bacteria, viruses *diameter of 10 micrometers of less
PM2.5
*fine particles *diameter of less than 2.5 micrometers
Micrometer
*um *AKA micron *10^-6 of a meter
Mixture
Physical combination of 2+ substances
Air composition reference tables list no humidity...
Because % varies according to climate & daily forecast
Air contains:
*oxygen *nitrogen *argon *carbon dioxide *water
Normal composition of dry air
*78% nitrogen *21% oxygen *1% other gases
Percent AKA
Parts per hundred (pph)
Volume of a gas...
*increase w/ temperature *decreases w/ pressure *so compare all gases @ same temp & pressure
Ppm
*parts per million * 1/1,000,000 is 10,000x less than 1%
Odors
*travel thru air in trace quantities *olfactory receptors (nose) is extremely sensitive
Carbon monoxide (pollutant)
*"silent killer" *causes dizziness, headache, nausea & sometimes death *Ex: generator, charcoal grill, auto exhaust
Ozone (pollutant)
*chest pain, coughing, sneezing *pulmonary congestion *Ex: photocopiers, electric motors
Sulfur & nitrogen oxides (pollutant)
*affects elderly, children, people w/ emphysema or asthma *contributes to acid rain & London fog of 1952