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Common Polyatomic Ions

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Common Polyatomic Ions +1 CHARGE -1 CHARGE -2 CHARGE -3 CHARGE -4 CHARGE ion name ion name ion name ion name ion name NH4+ ammonium H2PO3- dihydrogen phosphite HPO32- hydrogen phosphite PO33- phosphite P2O74- pyrophosphate H3O+ hydronium H2PO4- dihydrogen phosphate HPO42- hydrogen phosphate PO43- phosphate Hg22+ mercury(I) HCO3- hydrogen carbonate CO32- carbonate PO23- hypophosphite HSO3- hydrogen sulfite SO32- sulfite AsO33- arsenite HSO4- hydrogen sulfate SO42- sulfate AsO43- arsenate NO2- nitrite S2O32- thiosulfate NO3- nitrate SiO32- silicate OH- hydroxide C22- carbide CH3COO- acetate C2O42- oxalate CrO2- chromite

World history notes

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Chapter 14 The Last Great Nomadic Challenges: From Chinggis Khan to Timur Introduction Mongols ended/interrupted many great postclassical empires Extended world network ? foundation for interaction on global scale Forged mightiest war machine Four khanates ? sons divided Ruled for 150 years Last time nomadic peoples dominated sedentary peoples Paradox of rule ? fierce fighters vs. tolerant/peaceful leaders The Mongol Empire of Chinggis Khan Introduction difficult to organize before Chinggis Khan a. divisions/rivalries b. Khan ? astute political strategist/brilliant military commander 2. Nomadic world ? horse culture a. Lived on herds ? meat, milk, traded hides for grain/vegetables b. Tough little ponies c. Children ride from early age

Equlibrants

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Equilibrants
Vectors

Equilibrants Example 1: There is a river with a current that has a velocity of 3 m/s in a direction of east. A man is trying to get straight across the river. His boat has a velocity of 4 m/s. What angle does he need to face the boat to move directly across the river? Explanation: We have 3 vectors in this problem: 1. The boat going straight across from point A to point B, which is the resultant. 2. The boat?s vector in calm water, which is the vector pointed at North West and has a magnitude 4 m/s. 3. The river?s current, which is 3 m/s going east. An object often looks like they are directed toward an angle, but they are actually going straight

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