CHEM152L final conceptual practice review

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152L

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Chemistry

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Feb 20, 2024

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Part 1 - Empirical Formulas & Chemical Reactions (7 points) ‘Try to work through this and then see the answer key to check your answers. 1. Which is the proper empirical formula for magnesium oxide? a Mg, bMgO cMgO, dMgO e none of these 2. Which is the proper empirical formula for copper(II) chloride? a CuCl b.CuCl ¢ CuCly CuxCly e. none of these Use the following choices to classify the chemical reactions in # 1-5, below. a. Combination/Synthesis b. Decomposition . Single Displacement d. Double Displacement (Precipitation) e. Double Displacement (Neutralization) 1. 2Mg(s) + Ox(g) > 2 MgO(s) 2. 2 NaHCOs(s) + heat - Na:xCOx(s) + H:0(1) + COx(g) 3. Zn(s)+2 HCl(aq) > Hu(g) + ZnCl(aq) 4. HCl(ag) + NaOH(aq) > H:0(1) + NaCl(aq) 5. AgNO(aq) + Kl(ag) > Agl(s) + KNOs(aq)

Part 2 - Synthesis, Theoretical Yield, and Percent Yield (5 points) Use the data & chemical equation, below, to answer the questions. Salicylic Acid + Acetic Anyhydride > Aspirin + Acetic Acid _(all mole ratios are 1:1) Molar Mass of Salicylic Acid = 138.12 grams/mol Molar Mass of Aspirin = 180.15 grams/mol Try to work through this and then sce the answer key to check your answers. 1. Caleulate the theoretical yield of aspirin, in grams, if 2.150 grams of salicylic acid is reacted with excess acetic anhydride (i.e. salicylic acid is the limiting reactant). (Show calculations, round to the correct number of significant figures & record proper units.) - 3 points 2.1f the actual yield of aspirin is 2.250 grams, then calculate the % yield for aspirin in this experiment. (Show calculations, round to the correct number of significant figures & record proper units.) - 2 points

Part 3 - Ideal Gas Constant (5 points) Try to work through this and then see the answer key to check your answers. Use the data & chemical equation, below, to answer the questions. Mg(s) + 2 HCl(aq) > Ha(g) + MgCh(aq) PV =nRT Mass of Mg used = 0.080 g Molar Mass of Mg metal = 24.31 grams Volume of hydrogen gas collected: 80.00 mL | Temperature: 22.0 °C; (K = °C + 273.15) Total (atmospheric) Pressure: 756.0 mmHg | (1 atm = 760 mmHg, exactly) Vapor Pressure of water at 22.0 °C = 19.827 mmHg Assuming that the hydrogen gas is collected over water! a. Calculate the value of R for this experiment. (Show calculations, round to the correct number of significant figures & record proper units.) - 3 points b. If the true value of R is 0.08206 Leatmy/Kemol, then determine the % error for your calculated R value. (Show calculations, round to the correct number of significant figures & record proper units.) - 2 points

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Part 4 - Solutions (5 points) Use the given data to answer these questions and then see the answer key to check your answers. Mass of NaCl residue = 0351 g Molar Mass of NaCl = 58.44 grams/mol Mass of NaCl solution = 10.00 g Volume of NaCl solution = 10.00 mL Calculate the mass% & molarity (M) for the salt solution data, given above. Mass % = (mass of solute/mass of solution) x 100 ‘Molarity = (moles solute)/liters solution

Part 5 Error Analysis (3 points) 1. In Experiment #8, Synthesis of Aspirin, if the aspirin sample was weighed when it was much warmer than room temperature, this would make the calculated % yield atoohigh b.toolow c.unaffected 2. In Experiment #10, Ideal Gas Law Constant, R, if a piece of Mg metal stuck to the side of the eudiometer during the experiment, and wasn’t noticed, the would make the calculated R value atoohigh b.toolow c.unaffected 3. In Experiment #11, Solutions, if the NaCl residue was still wet when it was weighed, this would make the ‘molarity calculation . atoohigh b.toolow c.unaffected Part 6 - Your Thoughts (5 points - you may prepare this ahead of time) Write a short paragraph about the experiment that you enjoyed the most in Chem 152L. Briefly deseribe the experiment, describe what you learned from it, and state why you enjoyed it.

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