CHEM 001 Lecture Notes - Lecture 3: Antibiotics, Hatmaking, Boiling Point

• School: College of The Sequoias
• Department: Chemistry (CHEM)
• Course: CHEM 001
• Professor: Rodriguez

Document Summary

Metals have many effects on the human body. Silver: antibiotic effect in the colloidal state. Many metals mix together in various proportions when melted to form alloys. Stainless steel: 74% iron, 18% chromium, 8% nickel. Properties of alloys: intermediate between those of their component metals, however there are exceptions, such as hardness. The ages of history are named after the principal materials that were used. An alloy of 89% copper and 11% tin. Harder than copper and melts at a lower temperature. More difficult to utilize due to its high melting point. Steel, a much harder alloy, was subsequently discovered when charcoal. Gold: valuable and versatile element (carbon) was added to the iron. One of the first elements to be discovered. Gold jewelry as old as 3500 bc has been discovered. The natural metal is an alloy containing some other metals. Too soft to be used in jewelry so it is usually alloyed with silver and copper or other metals.