CH 304K 1st Edition Lecture 2 Outline of Last Lecture I. Chemistry and how it affects our world Outline of Current Lecture II. Chemicals are everywhereIII. Composition of AirIV. Concentration MeasurementsCurrent LectureChemistry- Study of changes that matter undergoesChemicals- EVERYTHING is made of chemicals- There is no such thing as chemical-free food, water, or air- Things can be contaminated with chemical compounds which can give them the potential to be harmfulAir- Gas we are most familiar with- It is a mixture; the air we breathe is NOT pure oxygen!- Components: Nitrogen (78%), Oxygen (21%), Argon (0.9%), Carbon dioxide (0.04%), and water vapor (amount varies)- The minimum oxygen levels humans need in the air is 19.5%Concentration Measurements- Some things are too small to be measured in percent- Percent= parts per hundred or part/100These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Ppm= parts per million or part/106- Ppb= parts per billion or
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