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# Review Sheet for CHEM 1301 with Professor Bott at UH chemical equation

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Date Created: 02/06/15

CHEM 1301 THIRD TEST REVIEW Chemical Equations Express reactions as equations These a b must contain the symbolsformulas for substances involved in the reaction things on left are reactants things on right are products must be balanced 7 same number of each type of atoms on each side Balance by placing COEFFICIENTS in front of formulas 7 don t add molecules or change formulas Also don t use fractions for coefficients 1 A A A A A A A When the equation C2H4 02 gt C0 H20 is balanced what is the coefficient of Oz 1 B 2 C 3 D 4 E 5 When the following equation is balanced what is the coefficient of Oz C3H8 02 gt C0 H20 1 B 2 C 3 D 5 E 7 Balance the following equation B203s HF1 gt BF3g HzOl What is the coefficient of water 3 B 1 C 4 D 2 E 5 Balance the following equation UOzs HF1 gt coefficient of water UF4s HzOl What is the 1 B 2 C 3 D 4 E 5 Balance the following equation C5H5l Ozg gt the coef cient of water H20g C02g What is 2 B 4 C 6 D 8 E 10 Balance the following equation C8H18031 Ozg gt HzOg COzg What is the coef cient of water 4 B 9 C 5 D 3 E 10 Balance the following equation Ca3PO42s SiOzs Cs gt CaSiO3s C0 P4 What is the coefficient of C 2 B 6 C 8 D 10 E 12 8 Balance the following equation B5H9l Ozg gt B203s HzOg What is the coefficient of water A 10 B 9 C 6 D 8 E 14 Moles and Molar Mass A mole is 602 X 1023 1 mole of something has the relative mass of that thing in grams When calculating moles from grams or grams from moles use DIMENSIONAL ANALYSIS or equation n g MM 9 Calcium uoride Can used to uoridate drinking water Calculate its molar mass in gmol A 11815 B 9915 C 7807 D 5908 10 Calculate the molar mass in gmol of tetraphosphorus decaoxide P4010 A 46973 B 28389 C 19097 D 9497 11 Calculate the molar mass in gmol of rubidium carbonate szC03 A 34043 B 25500 C 23094 D 11348 12 Calculate the molar mass in gmol of NH43AsO4 A 41780 B 19303 C 16502 D 15696 13 Aluminum sulfate A12SO43 is used in tanning leather purifying water and manufacture of antiperspirants Calculate its molar mass in gmol A 45006 B 34215 C 31515 D 27802 14 Calculate the mass in grams of 235 mol of sodium chloride or common table salt A 221 g B 137 g C 939 g D 584 g 15 Magnesium uoride is used in the ceramics and glass industry What is the mass of 172 mol of magnesium uoride A 107 g B 745 g C 623 g D 433 g 16 Sodium bromate NaBr03 is used in a mixture which dissolves gold from its ores Calculate the mass in grams of 468 mol of sodium bromate A 706g B 482g C 322g D 00310g 17 What is the mass in grams of 0250 mol of the common antacid calcium carbonate A 400 X102g B 250 g C 400 gtlt10392g D 250 gtlt10393g 18 Calculate the number of moles in 178 g of the antacid magnesium hydroxide MgOHz A 328 mol B 232 mol C 0431 mol D 0305 mol 19 Calculate the number of moles in 387 g of PC15 A 538 mol B 355 mol C 0282 mol D 0186 mol 20 Aluminum oxide A1203 is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators Calculate the number of moles in 4751 g of A1203 A 2377 mol B 2146 mol C 04660 mol D 04207 mol To go between moles of something and molecules of the thing N 602 x1023 x n or use dimensional analysis NOTE atoms and molecules are NOT the same thing 21 How many molecules are present in 245 moles of water A 246 x 1023 B 147 x 1024 C 0136 D 735 E 441 22 The number of hydrogen atoms in 0050 mol of C3H803 is think about it A 30 X 1022 B 12 X 1023 C 24 X 1023 D 48 X 1023 Can use the coefficients in balanced equations to relate MOLES of one thing to MOLES of another nBbanA 23 A 24 A a and b are the coefficients of A and B in the equation Sulfur dioxide reacts with chlorine to produce thionyl chloride and dichlorine oxide SOzg 2C12g gt SOClzg Cleg If 0400 mol of C12 reacts with 80 how many moles of C120 are formed 0800mol B 0400m01 C 0200mol D 0100m01 Aluminum will react with bromine to form aluminum bromide used as an acid catalyst in organic synthesis Als Br2l gt AlzBr5s How many moles of A1 are needed to form 243 mol of AlzBr5 243 mol D 162 mol 729 mol B 486 mol C 25 Ammonia will react with uorine to produce dinitrogen tetra uoride and hydrogen uoride used in production of aluminum in uranium processing and in frosting of light bulbs 2NH1g 5mg a N2F4g 6HFg How many moles of NH3 are needed to react completely with 136 mol of F2 A 34011101 B 680mol C 54411101 D 22711101 26 TitaniumIV oxide extensively used as a white pigment reacts with bromine tri uoride to form titaniumIV uoride bromine and oxygen 3TiOz 4BrF3 gt 3TiF4 2Brz 302 How many moles of bromine tri uoride are needed to react completely with 968 mol of titaniumIV oxide A 12911101 B 968mol C 72611101 D 32311101 We can put them together to do more complex calculations Two approaches to doing these Dimensional analysis or the Roadmap grams of A grams of B g g ngMM Pal tiCIeS Moles of A Moles of B Particles NA lt 23gt nA lt gt 11B lt 23 NB N602x 10 n nBbanA N602x 10 n 27 Ammonia an important source of xed nitrogen that can be metabolized by plants is produced using the Haber process Nzg 3Hzg gt 2NH3g How many grams of nitrogen are needed to produce 325 grams of ammonia A 1070g B 535g C 267g D 178g 28 How many grams of sodium uoride used in water uoridation and manufacture of insecticides are needed to form 485 g of sulfur tetra uoride 3SC121 4NaFs gt SF4g SzC12l 4NaCls A l510g B 754g C 205g D 513g 29 How many grams of oxygen are needed to react completely with 2000 g of ammonia NH3 4NH3g 502g gt 4NOg 6H20g A 4697g B 3006g C 3406g D 2180g 25 Ammonia will react with uorine to produce dinitrogen tetra uoride and hydrogen uoride used in production of aluminum in uranium processing and in frosting of light bulbs 2NH1g 5mg a N2F4g 6HFg How many moles of NH3 are needed to react completely with 136 mol of F2 A 34011101 B 680mol C 54411101 D 22711101 26 TitaniumIV oxide extensively used as a white pigment reacts with bromine tri uoride to form titaniumIV uoride bromine and oxygen 3TiOz 4BrF3 gt 3TiF4 2Brz 302 How many moles of bromine tri uoride are needed to react completely with 968 mol of titaniumIV oxide A 12911101 B 968mol C 72611101 D 32311101 We can put them together to do more complex calculations Two approaches to doing these Dimensional analysis or the Roadmap grams of A grams of B g g ngMM Pal tiCIeS Moles of A Moles of B Particles NA lt 23gt nA lt gt 11B lt 23 NB N602x 10 n nBbanA N602x 10 n 27 Ammonia an important source of xed nitrogen that can be metabolized by plants is produced using the Haber process Nzg 3Hzg gt 2NH3g How many grams of nitrogen are needed to produce 325 grams of ammonia A 1070g B 535g C 267g D 178g 28 How many grams of sodium uoride used in water uoridation and manufacture of insecticides are needed to form 485 g of sulfur tetra uoride 3SC121 4NaFs gt SF4g SzC12l 4NaCls A l510g B 754g C 205g D 513g 29 How many grams of oxygen are needed to react completely with 2000 g of ammonia NH3 4NH3g 502g gt 4NOg 6H20g A 4697g B 3006g C 3406g D 2180g 30 A 31 A 32 A 33 A 34 A 35 A 36 A 37 A 38 A How many grams of IO2F are needed to react completely with 1500 g of BrF3 3 IO2Fs 4BrF3l gt 3IF51 2Br21 3O2g 2600 g B 1462 g C 1218 g D 6498 g Phosphine an extremely poisonous and highly reactive gas will react with oxygen to form tetraphosphorus decaoxide and water PH3g O2g gt P4010s H2Og Calculate the mass of P4010s formed when 225 g of PH3 reacts with oxygen 1880 g B 940 g C 470 g D 563 g Calculate the mass of chromiumIH chloride formed when 125 g of chlorine gas used as bleach and as a disinfectant for water supplies reacts with chromium Crs Cl2g gt CrC13s 419 g B 186 g C 135 g D 599 g Potassium chlorate used in reworks ares and safety matches forms oxygen and potassium chloride when heated KC103s gt KCls O2g How many grams of oxygen are formed when 264 g of potassium chlorate is heated 223g B 991g C 103g D 460 g Aluminum metal Al reacts with chlorine gas Cl2 to form solid aluminum trichloride AlCl3 What mass of chlorine gas is needed to react completely with 163 g of aluminum 643g B 321g C 245g D 214g Barium hydroxide used in corrosion inhibitors and lubricants reacts with chloric acid HC103 to form barium chlorate BaC1032 and water What mass of water is formed when 138 g of barium hydroxide reacts with chloric acid 325g B 290g C 162g D 731g LeadH sul de PbS was once used in glazing earthenware It will also react with hydrogen peroxide H202 to form leadII sulfate and water How many grams of hydrogen peroxide are needed to react completely with 265 g of leadII sulfide 151g B 123g C 377g D 941g Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain Calculate the mass in grams of365 X 1020 molecules of 303 606 X 10394 g B 485 X 10392 g C 206 g D 1650 g Calculate the mass in grams of 835 X 1022 molecules of CBr4 460 g B 721 g C 0139 g D 00217 g Some really nasty ones are as follows The trick with these is to recognize what N stands for and what the formula involves 39 A C 40 A C Calculate the number of oxygen atoms in 2934 g of sodium sulfate NazSO4 B D Potassium dichromate KzCrzO7 is used in tanning leather decorating porcelain and water proo ng fabrics Calculate the number of chromium atoms in 7882 g of KzCrzO7 B D 4976 X 1023 0 atoms 1166 X 1025 0 atoms 1244 X 1023 0 atoms 2915 X 1024 0 atoms 1124 X 1024 Cr atoms 1613 X 1023 Cr atoms 2248 X 1024 Cr atoms 3227 X 1023 Cr atoms Moles and Molarity Sometimes one doesn t do a reaction with PURE substances but one uses a solution chapter 10 If we use a solution we can measure volume and work out how many moles are in it if we know the MOLARITY of the solution Molarity moles liters of solution We can include molarity in the Roadmap as well Particles NA 41 A grams of A grams of B 8 g n g MM Moles ofA Moles ofB Particles N602X 102311 HA nB N602X1023n NB gt 113 banA M n L Volume of Volume of Solution L Solution L Hydrochloric acid is widely used as a laboratory reagent in re ning ore for the production of tin and tantalum and as a catalyst in organic reactions Calculate the number of moles of HCl in 006285 L of 0453 M hydrochloric acid l04mol B 0139mo1 C 00285mol D 000721mol 42 A 43 A 44 A 45 A 46 A 47 A 48 A 49 A 50 Sodium hydroxide also known as caustic soda is used to neutralize acids and to treat cellulose in making of cellophane Calculate the number of moles of solute in 1875 mL of 1356 M NaOH solution 2543 mol B 03932 mol 1383 mol C 07232m61 D A 0150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood Calculate the mass of solute needed to prepare 2750 mL of a physiological saline solution 319g B 161g C 877g D 241g Sodium chlorate is used as an oxidizer in the manufacture of dyes explosives and matches Calculate the mass of solute needed to prepare 1575 L of 000250 M NaC103 419 g B 169 g C 0419 g D 0169 g Lithium hydroxide is used in alkaline batteries Calculate the molarity of a solution prepared by dissolving 358 g of LiOH in enough water to give a nal volume of 7500 mL 199 M B 0502 M 150M C 112M D Calculate the molarity of 125 L of a solution which contains 2387 g of CoClz 230 M B 147 M C 0435 M D 0680 M Calculate the molarity of a 2355mL solution which contains 2824 mg of sodium sulfate used in dyeing and printing textiles 1199M B 08339M C 02031M D 0008445M When 261 g of solid NazC03 is dissolved in sufficient water to make 250 mL of solution the concentration of NazC03 is 00246M B 104M C 0205M D 00985M What mass in g of solid CuSO4 is needed to make up 250 mL ofa 0300 M solution ofthis salt 836 B 120 C 750 399 D 479 E How many milliliters of 158 M HCl are needed to react completely with 232 g of NaHC03 HClaq NaHC03s gt NaCls H201 COzg A 638 mL B 572 mL C 536 mL D 175 mL 51 How many g of Mg are required to react with 250 mL of a 0250 M solution of HCl MgS t HClaQ gt MgClzaQ H2 A 00625 B 0759 C 152 D 304 E 625 52 Aqueous solutions of H2SO4 and sodium hydroxide react to produce sodium sulfate and water How many mL of 0350 M NaOH will react with 500 mL of 025 M H2SO4 A 00357 B 125 C 179 D 357 E 714 Reaction Types Different types of reactions Combination or Synthesis Decomposition Single displacement Double displacement metathesis Combustion A B gt C A sometimes heat gt B C A BC gt AC B AB CD gt AD CB Reaction with oxygen usually with generation of heat make OXIDES of the elements in the original compound Describe the following reactions as A Combination synthesis B Decomposition C Single displacement D Double displacement E Combustion 53 H2 C12 gt 2 HCl 54 CaCl22 H2O heat gt CaCl2 H20 55 H2C03 gt H2O CO2 56 2 Na H2O gt 2 NaOH H2 57 Zn FeCl2 gt ZnC12 Fe 58 BaCl2 K2SO4 gt BaSO4 2 KCl 59 H2SO4 2 KOH gt H2O K2SO4 60 CH4 2 02 gt CO2 2 H2O ANSWERS 1 30 CDABClBDBCBlCBBBAlABDDClBCCBClACBABl 3160 CBCABlABABClCADCAlBDDBDlBEABBlCCDDE

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