Exam 2 Study Guide
Exam 2 Study Guide CHMY 141N - 00
Popular in College Chemistry I
Popular in Chemistry
This 15 page Study Guide was uploaded by Corymarie Notetaker on Sunday October 11, 2015. The Study Guide belongs to CHMY 141N - 00 at University of Montana taught by Mark Cracolice (P) in Fall 2015. Since its upload, it has received 71 views. For similar materials see College Chemistry I in Chemistry at University of Montana.
Reviews for Exam 2 Study Guide
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 10/11/15
CHMY 141 Study Guide Midterm 2 Key Concepts to Know for the Exam quot Ac39ds Avogadro39s number 602x1023 constant for 1 mole molecules carbonic acid H2003 nitric acid HNOs phosphoric acid H3PO4 sulfuric acid H2304 of oxygens relative to PrefixSuffix Example Formula Example Name the ic acid chloric acid HC03 one more per ic HCIO4 Perchloric Acid same memorized ic acid ic HCIO3 Chloric Acid one fewer ous HCIO2 Chlorous Acid two fewer hypo ous HCIO Hypochlorous Acid No Oxygen hydro ous HCI Hydrochlorous Acid Molar mass of compound Empirical Formula units In 1 Molecule molar mass of empirical formula Organization Chart for solving for Empirical Formula Element Grams Moles Mole Ratio Formula Empirical 3993 of 3 Ratio Formula elements divided by the smallest mole calculated Reactants Reaction Type Equation Type Products Any combination of elements and compounds Combination A X AX one compound that form one product Doublereplacement AX BY AY BX two new compounds which may be a solid water acid or an aqueous ionic compound Solution of two ionic compounds each with a positive and negative ion A little cheat to Ionic Compounds and Balancing Formulas for Chemical Equations charge of Al ion always comes 1st 7 Charge of 804 ion always comes 2nd Aluminum sulfate 23 3A 4A 5A 6A 7A 8A H2 9 He 9 N2 9 02 9 F2 g Ne 9 P4 s Se 9 0392 g Ar 9 gm 0 Kr 9 I2 3 Xe g Hg I Rn g Ar of Al needed V 804 of SO4 needed Practice Exam 1 Given a name write the formula given a formula write the name I Perchlorate ion II Barium Carbonate III NH 4I IV Hydrogen sulfate ion V Potassium nitrate VI so3 VII Hs VIII Beer2 IX Aluminum Nitrate X Oxygen difluoride XI Hypochlorous acid XII Chromium bromide XIII KHCO3 XIV Calcium dihydrogen phosphate XV NH4IO3 XVI Tetraphosphorus heptasulfide 2 Hydroxylapatite Ca5PO43OH is a mineral in bones and teeth Determine the number of phosphate ions in a sample of hydroxylapatite that contains 10X10394 grams of Oxygen 3 ls the mole a number Explain 4 CoaSbOC X H20 is the general formula of a certain type of hydrateWhen 430 grams of the compound is heated to drive off water 261 grams of anhydrous compound is left Further analysis shows that the percentage composition of the anhydrate is 424 Co 230 S and 346 0 Find the empirical formula of the anhydrous compound and the hydrate 5 Acid rain is rainfall that contains sulfuric acid originating from organic fuels that contain sulfur The process occurs in three major steps The sulfur is first burned forming sulfur dioxide ln sunlight the sulfur dioxide reacts With oxygen in the air to produce sulfur trioxide When rainwater falls through the sulfur trioxide the reaction produces sulfuric acid Write the equation for each step in the process and tell What kind of reaction it is 6 When sodium hydroxide and magnesium nitrate solutions are combined the expected products result How many grams of magnesium nitrate must be used to precipitate as magnesium hydroxide all of the hydroxide ion in 500 milliliters of 170 sodium hydroxide solution the density of Which is 119gmL 7 Carbon monoxide reacts With oxygen to form carbon dioxide 1000 kilograms of carbon monoxide and 1000 kilograms of oxygen are placed in a reaction vessel and the reaction is initiated It goes to completion and no other reactions occur Determine the weight in pounds of each substance in the vessel after the reaction 8 A phosphate rock quarry yields rock that is 794 calcium phosphate the raw material used in preparing CaH2P0427 a fertilizer known as superphosphate The rock is made to react with the sulfuric acid according to the equation Ca3 P042 2 H2SO4 CaH2P042 2 CaSO4 What is the smallest number of kilograms of rock that must be processed to yield 0500 ton of fertilizer Practice Exam Answers 1 Given names give formula Given formula give names 1 310439 ii BaCO3 iii ammonium iodide iv H803quot v KNO 3 vi sulfur triOXide vii hydrogen sulfate ion viii beryllium bromide lX AlN033 X OF2 Xi HClO Xii CrBr2 Xiii potassium hydrogen carbonate Xiv CaH2PO42 XV ammonium iodate Xvi P 4S7 2 1051104 P4 X 1mol P4 X 602111023 P4 molecules X 4 P atoms 2 165511024 P atoms 12388 g P4 1 mol P P4 molecules 4 3 By definition the mole is the amount of any substance that contains the same number of units as the number of atoms in exactly 12 grams of carbon 12 The definition doesn t say What that number is Through experiment we have found that to three significant figures there are 602X1023 atoms in 12 grams of carbon 12 Element Grams Moles Mole Ratio Formula Ratio Empirical Formula Co 424 0719 100 1 S 230 0717 100 1 O 346 216 301 3 C0803 C0803 261 0188 100 1 H20 169 0938 499 5 CoSO3 5H20 5 i S8 8 02 gt 8 S02 Combination ii 2 S02 02 gt 2 S03 Combination iii SO3 H20 Igt H2SO4 Combination 6 2 NaOH MgltNO32 gt 2 NaNO3 MgltOH2 500 mL X 119 g soln X 170 g NaOH X 1 mol NaOH X 1mol MgN032 X 14833g MgltN03 mL 80111 2 H101 H101 C 2 188g MgN032 72coo2 2co2 1000 kg 00 X 1 krnol 002801 kg 00 X 2 krnol 0022 krnol 00 X 1000g 0021 kg CO2 X 11b 00245359g CO2 3464110 CO2 1000 kg 02 X 1 km01023200g 02 X 2 krnol 0022 krnol 00 X 1000g 0021 kg 002 X 11b 00245359g CO2 6064110 CO2 3464 1b 002 Will be present after the reaction is complete 00 is the limiting reactant so there will be no 00 in the vessel 1000 kg 00 X 1 krnol 002801 kg 00 X 1 km01022 krnol 00 X 3200g kg 021 krnol CO 5712 kg 02 consumed 1000 kg 02 5712 kg 02 429 kg 02 remains 429 kg 02 X 1000g1 kg X 1 lb 45359g 946 lb 02 Will be present after the reaction 8 500 ton 334H2P042 X 20001b1 ton X 1 kg2201b X 1 kmol CaH2P042 23405kg 034H2P042 X 1 km010a3P0421 11110103LH2P042 X 31018kg Ca3P042 kmol 33131 042 X 100kg rock 794kg 33131 042 759 kg rock
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'