[CHEM 1A03] - Final Exam Guide - Everything you need to know! (24 pages long)

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David Brock

Document Summary

Composition of sea water: 3. 5% dissolved salts (mostly sodium chloride) Composition of air: 78% nitrogen, 21% oxygen, 1% other gases. Methods of physical separation: evaporation, distillation, crystallization, filtration. Fractional distillation of air: obtain nitrogen and oxygen from air: melting point of oxygen: -183 c, melting point of nitrogen: -196 c, procedure: 2. cool air to -200 c such that both oxygen and nitrogen are liqui0ed. 3. remove solidi0ed carbon dioxide and water vapor with 0lter. Test for oxygen: put a glowing splint into a test tube of the gas. The glowing splint relights if it is oxygen. Flame test: test for metal ion compounds by the colour they produce when burned. 1. clean the end of a nichrome wire by dipping it into concentrated hcl acid. 2. heat nichrome wire in bunsen 8ame until 8ame is no longer coloured. 5. put the end of the nichrome wire in the bunsen 8ame again. 3. add a few drops of silver nitrate solution.