CHEMISTRY FINAL

CHEMISTRY FINAL - Chemistry Final Chapter 1 SI units ...

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Unformatted text preview: Chemistry Final Chapter 1 » SI units » know conversion table: giga G 10 9 mega M 10 6 kilo k 10 3 deci d 10-1 centi c 10-2 milli m 10-3 micro µ 10-6 nano n 10-9 Å 10-10 pico p 10-12 femto f 10-15 example problem: The radius of the rubidium (Rb) atom is about 2.1Å. a.) express this distance in nanometers (nm) answer: .21 b.) express this distance in picometers (pm) answer: 210 c.) how many rubidium (Rb) atoms would have to be lined up to span 1.0 mm? answer: 2.30e8 Chapter 2 » atomic structure: nucleons – protons and neutrons in the nucleus protons – positive charge; the atomic number equals the number of protons neutrons – neutral; no charge - all atoms have neutrons except hydrogen mass number= the number of protons + the number of neutrons; defines the isotope electrons – negative charge; found outside the nucleus » molecular and ionic formulas ionic formulas: 1. sodium sulfide = NaS 2. Na  Na + 3. S  S 2- 4. Na + S 2- - there needs to be a charged balance 5. you cross multiply to get the number of atoms 6. Na 2 S – correct formula formula’s from names: 1. iron(II) phosphate – Fe 2+ -and- PO 4 3- 2. Fe 3 (PO 4 ) 2 names from formula’s: 1. MnSO 3 2. Mn ? 3. SO 3 2- = sulfite 4. (Mn x ) (SO 3 2- ) - must balance 5. Mn 2+ = manganese(II) 6. manganese(II) sulfite molecular formula: exact numbers of atoms in the molecule empirical formula: lowest whole number ratio of atoms ionic formula: lowest whole number ratio example problem: name the following ionic compounds a.) LiNO3 answer: lithium nitrate b.) Sc2O3 answer: scandium(III) oxide c.) (NH4)2SO4 answer: ammonium sulfate d.) Mg(HCO3)2 answer: magnesium hydrogen carbonate e.) Cr(OH)3 answer: chromium(III) hydroxide » MEMORIZE common ions: Main Group Polyatomic Ions (CA = Central Atom; Ch = Ionic Charge) CA Polyatomic Ion Formu la Ch Add One H + Add Two H + As Arsenate AsO 4 3--3 Hydrogen arsenate HAsO 4 2--2 Dihydrogen arsenate H 2 AsO 4--1 C Acetate C 2 H 3 O 2--1 C Cyanide CN--1 C Carbonate CO 3 2--2 Hydrogen carbonate HCO 3--1 C Cyanate OCN--1 C Thiocyanate SCN--1 Br Perbromate BrO 4--1 Br Bromate BrO 3--1 Br Bromite BrO 2--1 Br Hypobromite BrO--1 Cl Perchlorate ClO 4--1 Cl Chlorate ClO 3--1 Cl Chlorite ClO 2--1 Cl Hypochlorite ClO--1 I Periodate IO 4--1 I Iodate IO 3--1 I Iodite IO 2--1 I Hypoiodite IO--1 N Ammonium NH 4 + +1 N Nitrate NO 3--1 N Nitrite NO 2--1 O Hydronium...
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This note was uploaded on 04/25/2008 for the course V 011 taught by Professor Staff during the Fall '06 term at NYU.

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CHEMISTRY FINAL - Chemistry Final Chapter 1 SI units ...

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