Chemistry 1A Stoichiometry Notes
Chemistry 1A Stoichiometry Notes Chem 1A
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This 2 page Class Notes was uploaded by Renee ODonnell on Wednesday September 28, 2016. The Class Notes belongs to Chem 1A at University of California Santa Barbara taught by Price in Summer 2016. Since its upload, it has received 2 views.
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Date Created: 09/28/16
Chemistry 1A Week 2 Lecture 3 Periodic Table 3 elements recently found in June • one found in Japan (113) • one found in Russia (115) • one found in Texas (117) Facts • Nobel gases weren’t originally on the table • Periodic table changed science from observational to actually going out and looking for information and data • elements that are arranged by increasing atomic # • vertical rows are called periods, horizontal rows are all periods • groups 1, 2, 13-18 are the main group Group 1: alkali metals are very reactive in water; changes colors, dissolves, lustrous, and low melting temperature Group 2: alkali earth metals are similar to G1 but less reactive Groups 3-11: transition metals are transitional in character between the vigorously reactive metals in the s block and the less reactive metals on the left side of the p block Group 17: halogens are nonmetals, very reactive with alkali/A. E. metals Group 18: noble gases are colorless, odorless, gasses, and inert due to their full octets Metals: conducts electricity, has a luster, is malleable, and is ductile Nonmetal: does not conduct electricity and is neither malleable nor ductile Metalloid: has the appearance and some properties of metals but behaves chemically like a nonmetal Ion: atoms lose or gain electrons until they have the same number of electrons as the nearest noble gas atom Cation: a positive charged ion formed by elements on the left side of the periodic table Anion: a negatively charged ions formed by elements on the right side of the periodic table If an atom had p=30, e= 28, and n= 34, === 64 30Zn 2+ Pure substance: a substance composed of only one type of element or compound Element: a substance that can’t be broken down to simpler substances • atomic: element that exists in nature with single atoms as their base unit • molecular: elements that exists as diatomic molecules in nature DIATOMIC MOLECULES: H2, N2, O2, F2, Cl2, Br2, I2
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