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CHE 152 Week 3 Notes

by: Tiffany Matyja

CHE 152 Week 3 Notes CHE 152

Marketplace > University of Tampa > CHE > CHE 152 > CHE 152 Week 3 Notes
Tiffany Matyja
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These are the notes from this week's lecture
General Chemistry 1
Thomas Jackman
Class Notes
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This 3 page Class Notes was uploaded by Tiffany Matyja on Sunday September 18, 2016. The Class Notes belongs to CHE 152 at University of Tampa taught by Thomas Jackman in Fall 2016. Since its upload, it has received 24 views. For similar materials see General Chemistry 1 in CHE at University of Tampa.


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Date Created: 09/18/16
Friday, September 16, 2016 Week 3 Notes CHE 152 - Ions and the periodic table for main group elements: • - metals lose electrons (until they have the same number of electrons as the nearest noble gas) and become cations - nonmetals tend to gain electrons (until they have the same number of electrons as the nearest noble gas) and become anions • an atomic mass unit (amu) is exactly 1/12 the mass of a carbon-12 isotope • isotopic mass: the mass of a given isotope - the mass number =/= the mass on the periodic table (atomic mass) this is because the atomic mass is the weighted average of the isotopes of a • given element. found by taking the sum of isotopic masses multiplies by their abundance fraction • molar mass: the atomic mass expressed in grams - Avogadro’s number and the mole • Avogadro’s number is 6.022 x 10 23 • the mole is a unit for expressing the number of expressing the number of atoms, ions, molecules, etc. in a “common-size” unit • a mole is the amount of anything that contains Avogadro’s number of units - mole = (number of things) / (6.022 x 10 )23 • the relationship between mass and moles - mole = (mass of the substance) / (molar mass) • compounds have different properties than reactants - there are 119 million known compounds • there are microscale and macroscale equations 1 Friday, September 16, 2016 - microscale equations: work with small quantitates of chemical substances - macroscale equations: used to demonstrate large-scale processes - Forming and Naming Compounds • cations - cations have the same name followed by “ion” (sodium ion, magnesium ion) - some metals, like copper and lead, have multiple charges. They can be differentiated by the suffixes -ous and -ic (ferrous (Fe ) and ferric (Fe )) 3+ • These would be written out Iron (II) and Iron (III), respectively - polyatomic cations formed from nonmetals end in -ium (NH is ammoni4m) • anions - monoatomic anions have names ending in -ide (bromide, chloride) - polyatomic anions containing a metal or nonmetal bonded to one or more oxygen atoms end in -ate or -ite • -ate is used for the most common oxyanion (SO 42-is sulfate, PO 43- is phosphate) • -ite is used for the oxyanion with one fewer oxygen atom than the most common oxyanion (SO 32-is sulfite, PO 33-is phosphite) • per…ate is used for one more oxygen than the most common oxyanion (ClO 4- is perchlorate) • hypo…ite is used for one less oxygen than the -ite oxyanion , ClO is - hypochlorite) anions derived by adding one hydrogen ion to an oxyanion are added either by • adding hydrogen before the name or adding the prefix bi- to the name (HCO 3- can be called either hydrogen carbonate or bicarbonate) acids • - all acids begin with H - acids based on anions that in -ide are formed by adding the prefix hydro- and the suffix -ic acid (HF is hydrofluoric acid) 2 Friday, September 16, 2016 - acids based on polyatomic anions that end in -ate are formed by changing -ate to -ic acid (H2SO i4 sulfuric acid) *think “-ate” something “-ic”ky* - acids based on polyatomic anions that end in -ite are formed by changing -ite to -ous acid (H 2O is3sulfurous acid) • binary molecular compounds - names are comprised of the element located farthest to the left on the periodic table, then the second element will end in -ide • if the elements are in the same group (column), the element located the lowest on the periodic table is written first greek prefixes are used to indicate how many of each element is present • - 1: mono (only used for the second element: i.e. CO is carbon monooxide) - 2: di - 3: tri - 4: tetra - 5: penta - 6: hexa - 7: hepta - 8: octa - 9: nona - 10: deca 3


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