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Chemistry Exam #3 Study Guide and Equations

Get prepared for your Chemistry Exam #3 with detailed study guides, essential equations, and practice problems. Make sure to bring all required materials for the exam.

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Chemistry Exam #3 Study Guide and Equations

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  1. Exam #3: Monday May 14th Scantron will be provided, also, a calculator if needed. Cell phones not allowed. Study Guide/ Exam aides:3 pages, 2-sided, handwritten notes (Exam 1&2 + 1),plus Periodic Table handout Keep all materials for final exam

  2. Exam #3 Pick up a Scantron at the front of class, also, a calculator if needed. Cell phones not allowed. Take out study aides, if you have any; 3 pages, 2-sided, handwritten notes,plus Periodic Table handout allowed in exam; Keep all materials for final exam DO NOT Turn Exam over until told to do so.

  3. Heat @ constant Pressure (Enthalpy) Hs l  g 100.g H2O (g) @ 100 oC Hvaporization = + 40.7 kJ/mol 100.g H2O (l) @ 100 oC q= Cp liq x mass x T Energy (q) H = 5.22 kJ Hfusion = 16.69 kJ 100.g H2 O (l) @ 25 oC H = Cp ice x mass x T H = 2.54 kJ Process Path H = Hice +Hfusion +Hliq If 50.0 g of ice @ -25 oC warms to 25 oC what is H of the process? H = ? H2 O (l) @ 0 oC H = 24.45 kJ H2 O (s) @ 0 oC

  4. The kidneys of an average size adult female filter 110 mL of blood per minute. If Deirdre has 5.5 liters of blood, how many minutes will it take to filter all of her blood in one cycle? Clearly show your answer and calculation by completing the following dimensional outline. Avogadro's Number C7H6O3MW = 138.12 grams (Salicylic Acid) Atoms grams (Aspirin) Molecules Weight SA) Stoichiometry g (fat) oz (peanuts) ? kJ oz (peanuts) "Gatekeeper" grams (WO3) (Molecular (Molecular mol SA grams (SA) 1 mol (SA) Weight A) 1 mol (WO3) C9H8O4 MW = 180.15 ? mol A

  5. WO3(s) + 3 H2(g) → W(s) + 3 H2O(g) An experiment reacted 25.0 grams of WO3 (molar mass = 232 g/mol) with 0.35 moles of hydrogen and produced 18.0 grams of tungsten, what is the theoretical yield and the percent yield? grams (Aspirin) grams (Salicylic Acid) Avogadro's Number Atoms C7H6O3MW = 138.12 Molecules Stoichiometry grams (SA) (Molecular 25.0 grams (WO3) 1 mol (WO3) mol SA Weight SA) ? (SA) ? mol A grams (WO3) 1 mol (SA) "Gatekeeper" (Molecular Weight A) C9H8O4 MW = 180.15

  6. WO3(s) + 3 H2(g) → W(s) + 3 H2O(g) grams (Aspirin) grams (Salicylic Acid) Avogadro's Number Atoms C7H6O3MW = 138.12 Molecules Stoichiometry grams (SA) (Molecular 25.0 grams (WO3) 1 mol (WO3) mol SA Weight SA) ? (SA) ? mol A grams (WO3) 1 mol (SA) "Gatekeeper" (Molecular Weight A) C9H8O4 MW = 180.15

  7. WO3(s) + 3 H2(g) → W(s) + 3 H2O(g) An experiment reacted 25.0 grams of WO3 (molar mass = 232 g/mol) with 0.35 moles of hydrogen and produced 18.0 grams of tungsten, what is the theoretical yield and the percent yield? Avogadro's Number grams (Salicylic Acid) Atoms grams (Aspirin) Molecules C7H6O3MW = 138.12 Stoichiometry grams (SA) (Molecular 25.0 grams (WO3) 1 mol (WO3) mol SA Weight SA) ? (SA) ? mol A grams (WO3) 1 mol (SA) "Gatekeeper" (Molecular Weight A) C9H8O4 MW = 180.15

  8. Dimensional Analysis Conversion/Unit Factor Calculations • Qualitative Description: Are you tall, short, average? vs. Quantitative?.....The height on your driver’s license. • Calculate your height in centimeters/ “scale factor” UNITS ___ ft___in ? cm • (1 ft = 12 in; 2.54 cm = 1 in) ? ? 12 2.54 __________________ + __________ = in ? ft ? in cm cm 2.54 ? cm 1 1 ft in in 1

  9. Dimensional Analysis Conversion/Unit Factor Calculations • Qualitative Description: Are you tall, short, average? vs. Quantitative?.....The height on your driver’s license. • Calculate your height in centimeters/ “scale factor” UNITS ___ ft___in ? cm • (1 ft = 12 in; 2.54 cm = 1 in) ? ? _____________________ + __________ = ? ? cm ft 12 in 2.54 cm ? cm 1 ft 1 in

  10. Dimensional Analysis Conversion/Unit Factor Calculations • Qualitative Description: Are you tall, short, average? vs. Quantitative?.....The height on your driver’s license. • Calculate your height in centimeters/ “scale factor” UNITS ___ ft___in ? cm • (1 ft = 12 in; 2.54 cm = 1 in) ? ? _____________________ + __________ = ? ? in ft 12 in 2.54 cm 2.54 cm ? cm 1 ft 1 in 1 in

  11. Dimensional Analysis Conversion/Unit Factor Calculations _____________________ + ____________ = cm ? ? _____________________ + __________ = ? ? in ft 12 in 2.54 cm 2.54 cm 7.5 x 102 g ? cm 5.9 x 10-4 cm3 1 ft 1 in 1 in

  12. Dimensional Analysis Conversion/Unit Factor Calculations ________________________________________ = ______ mL ? ? 16 0.0283 17.9% 1.0 mLoil kg 0.0283 2.0 mgCBD ? lbs ? oz ? kg 1 1 1.0 kgbody oz 0.787 gCBD 100% 1

  13. Dimensional Analysis Conversion/Unit Factor Calculations • Qualitative Description: Are you heavy, slim, average? vs. Quantitative?.....The weight on your driver’s license? birth certificate? • Calculate your weight in kilograms. Scale FactorUNITS: 1 kg = 2.2 lb; 1 lb = 16 ounces (oz); 1 ounce (oz) = 0.0283495 kg ___ lbs __ ounces ? kg ? ? 16 0.0283 oz kg kg 0.0283 ________________ + __________ = ______ ? lbs ? oz ? kg 1 1 oz oz lbs 1

  14. 16 31 15 16 16 15 31 16 a. b. c. d. Ga S P S

  15. Dimensional Analysis Conversion/Unit Factor Calculations ____________________________ ____________ 7.7 x 109 people 1 mol = 1.3 x 10 -14 mol 6.02 x 1023 people cm ? ? _____________________ + __________ = ? ? in ft 12 in 2.54 cm 2.54 cm 7.5 x 102 g ? cm 1 ft 1 in 1 in 5.9 x 10-4 cm3

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