Chemistry 2210A/B Lecture 14: Energy Use

• School: Western University
• Department: Chemistry
• Course: Chemistry 2210A/B
• Professor: Keith Griffiths

Document Summary

Fossil fuels, co2, emissions and global climate change. Coal: abundant in many parts of world, ese(cid:396)(cid:448)es to last a(cid:374)othe(cid:396) (cid:858)200 (cid:455)ea(cid:396)s(cid:859, approximately, coal is graphite, graded according to amount of carbon present, dirty fuel; forms no and so2 when burned, mainly used for electricity production. Natural gas: mostly methane, ch4, but may contain small amounts of other hydrocarbon gases, used for home heating, gas appliances, boiling point is 164 oc; can be liquefied for transport (high pressure necessary). Small amounts h2s are removed, but other thiols are added so that you can smell the gas. Large quantities held in methyl hydrates (or clathrates) in ocean sediments and permafrost (no technology to extract them yet). Global warming may release this gas into the air. Lpg can be used in vehicles; not as much energy produced as with gasoline: also used fo(cid:396) ho(cid:373)e heati(cid:374)g, (cid:272)ooki(cid:374)g, (cid:449)ate(cid:396) heati(cid:374)g . e(cid:448)e(cid:374) ge(cid:374)e(cid:396)ato(cid:396)s, more easily liquified than natural gas (why?) so much more easily stored.