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chem 135 umd

chem 135 umd

Description

School: University of Maryland
Department: Chemistry
Course: General Chemistry for Engineers
Professor: Elizabeth griffith
Term: Fall 2016
Tags: General Chemistry
Cost: 25
Name: Chem135 Week 8 class notes
Description: Covers chapters 8 and beginning of 9 in the textbook (chemical reactions and solubility)
Uploaded: 10/25/2016
7 Pages 226 Views 3 Unlocks
Reviews



to produce 750 mL of Solution - what is molarity?




reaction, how much BioHit and Oxygen (kg)?




0 kg, what is % yield?



CHEMICAL REACTIONS & QUANTITIES) Study Soup Physical changes vs. Chemical changes laters alter composition state or appearance of matter Chemical reactions Reactants - Products include: O molecular/ionic formulas © States of reactants/products (s,9,6,99) ® relative # of moie wies Stoichiometry - Stuay of numeri cal relationships between chemicaWe also discuss several other topics like mth 140
We also discuss several other topics like kin 351 class notes
Don't forget about the age old question of matlab quadratic fit
Don't forget about the age old question of drexel animation
We also discuss several other topics like would a substance that decreases membrane permeability
Don't forget about the age old question of mcphs intranet
l quantities in a chemical reaction StudySoup Study SOUT v Soup Balancing Chemicau keachons ex:) combustion of gaseous ethane w/ gaseous oxygen to form gaseous carbon dioxide & gaseous water o write unbalanced equation Cz Hiq (g) + O2(g) CO2 (g) + H2O(g) ☺ balance atoms in more complex molecules first » ALWAYS balance compounds before pure elements © balance pure elements C2 Hi8 + 02 → 2 CO2 + 3 H2O C-2 C-1 2 H-6 H- 26 0-2 → 7 0-3 5 7 get rid of fractions Ca Hi8 + 202 2002 + 3H20 x2 2C2 H18 (9) +702 (9) 4CO2(g) + 6H2O19) 6 check! SEASO Study Soup t containing poiyatomic lons (balance as a unit) ex:) aqueous lead Initrate and aqueous potassium Chloride to form solid lead Ichioride & aqueous Potassium nitrate, O Pb(NO3)2 (99) + KC (aq) → PbCl2 (5) + KNO3(aq) 2 Pb(NO3)2 + 2 kol PbCl2 + Z KNOZ Pb P bH KA I 2 . K -1 -2 I NO3-2 S ONINO3 -12 Mona C1 - 12a - 2 1Pb(NO3)2 (aq) +2KC1(99) Pb C12 (5) + 2 KNO3 (99) 2x Stoichiometry magnesium hydroxide neutralizes Hoi according to: Mg(OH)2 (99)+ 2HCl (99) → Z H2O(1) + MgCl2 199) - what mass of HCI (grams) is ineutralized by 3.269 Mg(OH)? conceptual plan: g Mg(OH)2 -> Moi Mg(OH)2 mol HC) ► 9 HCL Stoichiometry mw *coefficients in rxn specify relative amounts in moles of each thing in vxn* i moi Mg(OH)2 : 2 mol HCL $3269 mg (OH), Imol Mg(OH)2 2 mol HCL 36.49 HC) _ 4.089 158.31979 Mg(OH2) Imol Mg(OH)2 Ilmoita HOLT Limiting Reagents -reactions wi multiple reactants, one usually completely used before the other limiting reactant - limits rxn, completely consumed excess reactants - occurs in a quantity > than required to completely react with limiting veactant -amount of product that can be made from limiting reactant - theoretical yield MW. ( стат титулата Sud Sody Soup Shady Sou 4 82L: Moreticos x 10o -neorentol - o82 2519 Ti how muon Ticiu needed a 82% yielel T + 2MgCl2 Title + 2Mg ano Бzhuz actual л 250kg xoo.gs.б. А Poly 4 percent yield = theoretical x 100% → actual yield i wnat was actually produced b. actual amount produced was 25.0 kg, what is % yield? Study S anos EHN by to b дали Skzzzi) ht 24 Әјдшар Бооој Яну 10 і | o il TEANGIEOLIEHN TOM E62.9221 H bu vəл ила Био) - 01 ә16 Lmax amount of NH3 that can be mache = theoretical * L there will be some Nz left unreactool > in excess Hz is limiting produces leas+ NH3) NH3 ImolNz 28.01349N2 N2 TIK Stua soup has 877 Нм 10 ш 7 2N 10 м | |No0o1m bgaa za - EHN ZHIOM & Zubbs102 H 67111 (ам ELZ ZL FEHN там I TH 10м | 46 0001 H 6 27s Xн - figure out which reactant is limiting ;ZN GAGIE BUD ZH 671229 may sis ntuhs uogom рин (67) Отидишь 90 mləlb ou Элай 5) римо (6) HNL - (6) EN (6) ZHg UXA ha poti sautuhs dinom (Xə combustion Lo reaction of Substance compound Oz to produce oxygen containing (200 Dub O2H & Shonib naguba anbhu to nousnamas - Ortonoid o o təU Əon paid) ONUNAUTOXI - Studysol ex:) total of 120X106 kg of fuels alloween for biggest reaction, how much BioHit and Oxygen (kg)? Bio Hi4 tl O2 B2O3 + H2O sobra Study Soup al- & - H h Ol Z-a & MONOHTZ- H 0 - 22 22: 21 2.22+352 352 12 2.22 o-222 Bio H14 122.229 122.22-1352 (0.2577 TO, 352 0 2 2 2 22 352 0.7423 (1.20x106) (0.2577): 309240 kg Biotit M (120X106) (0.7423) - 890760 kg Oz 16 | D Study Soup cze O NECT WITTE TO OTTO TESTE TOP SOLUTIONS () StudySoup Studysouc mois Solve - homogeneous mixtures soup > Solute = minor componer (usually changes state) → Solvent : mayor component (usually stays some state) concentration > dilute Solutions - sman amount of solute > concentrated solutions - large amount of solute - Molarity (m) - iiters souvent ex) Solution preparece by clissolving 45 g Waal in enough water to produce 750 mL of Solution - what is molarity? Mnacio = 45. 01 Veot = 750m2 1000 = 0.750 L M- ? mol 45.0g Na cool imol -0.6045 mol Nacio 174.4399 M = 0.6045 mol Nacio-10.80 6 M 0.75 OLL ex:) Na CIO (aq) + 2NH3 (99) ► Nz Hz (aq) + NaCl (99) + H20 (4) if 750.0 mL of 0.806M Naci mixed w/ excess amonia, how many moles of Nz Hy can be formed? 750 mL soin IL som 1.806 mol Nacio Imol Naty -.6045 most T 1000 me son) soin Imol Naco Nz H4 if final ro wine is 1.25L - What is Molarity of Natu? M Ne Hy = 0.6045 mol = 10.484M 1.25L Dilution Ly amount of solute doesn't change, Volumne does M.V. - M2 V2 Study Soup Same Units ex) from #1 - Calculated molarity - to what volume should you dilute 0.100 c of this soluton to obtain a 0.300 M Naclo solution M. - 0.8061 M2=0.300M (0.806 M) (0.1002) - V2 (0.3001) Vi=10.100LS V2 = ? [12=0. 26941 Solubility > Soluble - solid will dissolve into hydrated cons Ly not soluble - solid will not dissolve a will remain as precibitate Four * like dissolves likex ) StudySoup interaction in tonic Solution Nach - when Naci put in water, attraction of Nat and c ons to H2O molecules competes wl attrachon to each other lonic compound when dissolvedl = Salt Solution fach ion atracted to H2O molecules pulled away from crystal . when in water - Isolated from other ions. • result = solumon w/ free moving charged particles able to conduct electricity Electrolyte Lo materials that dissolve in water to form Solution that will conduct electricity Saits Vs Sugars lons no lons electrolyte non-electrolyte electrolytes: Strong us. weak Strong - completely dissociate into ions (ex: la Cl2 → Ca2+ + or) weak - partial dissociation into ions (ex: HCOOH ZH*+COO-) compounds that dissolve in water but do not form ions - non electrolytes Solubility of Tonic compounds (U L Y *not all dissolve in water Soluble if dissowes - non soluble if does not dissolve StudySoup StudySoup anos Study SOUT d. Ba Sou - insoluble soluble C. Ca (NO3)2- in soluble b. CuCl2 r a. PbCl2 - insoluble insoluble or soluble ex:) Study Soup ANOT HHN +7 TON TIM nanios) e "Od 2006 ralanias hrubis +238 +245 +23 - Hot +zotz US1120) 115 + "HNICI'M'!S KOUD HOMagn1050 ZS 'HO 19910su 29 QL puot vuon buimonis in grounodwoo @ (tz pod 16V +29d10g +245/M poumd vaum 31911051) -z "OSA (+290 +226H SVIM Ioanned vaum 2190103u! - I 1815 H (SU04d23x2 Ou) -20H2) LSON 2 (BUOLA DxƏ OWHHN T UON +17, 2190105 29 04 Joust Juobumoljim slounadmos г а рм И1 5pЛnod ило) Отид 1 10 5ənz heljan10

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