Chem 1212 Lab Final Exam Study Guide Questions Answered Correctly Latest Update 2026

CHEM 1212 LAB FINAL EXAM STUDY GUIDE QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 what must you do before coming to the lab? - Answers take the lab quiz, write the chemical alert table in the lab notebook, review the chemicals and their hazards, read the experiment, prepare the lab notebook for the experiment which of the following items of clothing are appropriate to wear in CHEM 1212 lab to protect your skin ? - Answers lab apron, t-shirt, scrub pants, jeans which of the following are appropriate to wear in CHEM 1212 Lab to protect your feet? - Answers boots, loafers, or tennis shoes/sneakers where is the eye wash station located? - Answers mounted on the wall next to the large sink chemical causes dryness, itching, or sensitivity - Answers irritant irreversibly destroys living tissue or metal upon contact - Answers corrosive may cause harm through ingestion, inhalation, or skin absorption - Answers toxic chemical proved to cause cancer - Answers carcinogen excess chemicals disposal method - Answers appropriate waste container used filter paper disposal method - Answers trash can reaction mixture disposal method - Answers appropriate waste container cracked or chipped beaker disposal method - Answers broken glass box what if a person's hair catches on fire? - Answers wrap with fire blanket and stop, drop, and roll what if a chemical spills on your leg? - Answers remove affected clothing and rinse with water for 15 minutes what if a chemical gets in your eyes? - Answers flush with eye-wash solution for 15 minutes what if a chemical spills on your hand? - Answers rinse with water for 15 minutes what should you do if you spill a chemical on your lab bench? - Answers clean it up using the spill kit in your lab. can you eat or drink in the lab? - Answers no when is it okay to remove your chemical splash proof goggles? - Answers when everyone in the lab has put away all chemicals and glassware What is the density of a solid that occupies a volume of 5.89 mL and weighs 5.14 g? - Answers density = mass/volume 5.14 g/5.89 mL = 0.873 g/mL sugar disappears when added to hot tea. what describes the relationship between sugar and tea? - Answers soluble what will result when water (density = 1.0 g/mL), liquid M (density = 0.65 g/mL, immiscible with H2O), and liquid N (density = 0.80 g/mL, immiscible with M and H2O) are poured into test tube. - Answers three layers will form in the test tube. water is the bottom layer, liquid N is middle layer, and liquid M is the top layer. the ability for a gas or solid to dissolve in a liquid - Answers solubiliy mass to volume ratio - Answers density the ability for two liquids to mix together - Answers miscibility A + B → AB represents... - Answers combination ABC → AB + C represents.... - Answers decomposition AB + C → B + AC represents.... - Answers single displacement AB + CD → AD + BC represents... - Answers double displacement A + B → A+n + B-m represents... - Answers oxidation-reduction amount of product recovered in an experiment - Answers actual yield the amount of product produced if the experiment was 100% efficient - Answers theoretical yield actual yield over theoretical yield times 100 - Answers percent yield what is the equation for percent yield? - Answers actual yield/theoretical yield x 100 Cooper, Zach and Nate did this experiment dissolving 3.65 g of Cu(C2H3O2)2·H2O and adding 8.25 g NaC7H4SO3N·H2O (assume present in excess). What is the theoretical yield of the product, Cu(C7H4SO3N)2(H2O)4·2 H2O(s)? Molar Mass of Copper(II) acetate monohydrate = 199.65 g/mol Molar Mass of Sodium saccharinate monohydrate = 223.18 g/mol Molar Mass of product = 535.59 g/mol - Answers convert the grams of each compound to grams of the product - the lowest one is the theoretical yield 9.79 g In a similar experiment, Cooper, Zach & Nate started with 4.36 g of Cu(C2H3O2)2·H2O and 9.87 g of NaC7H4SO3N·H2O and obtained 10.08 g of Cu(C7H4SO3N)2(H2O)4·2H2O. Molar Mass of Copper(II) acetate monohydrate = 199.65 g/mol Molar Mass of Sodium saccharinate monohydrate = 223.18 g/mol Molar Mass of product = 535.59 g/mol Theoretical yield and percent yield? - Answers theoretical yield - 11.70 g percent yield - 86.2% For the procedural error, indicate if the error will affect the actual yield of copper(II) saccharinate product and if it does, will it raise or lower the actual yield: [experiment 4] Scraping the filter paper so hard that small bits of filter paper are with the crystals on the watch glass - Answers raises the actual yield For the procedural error, indicate if the error will affect the actual yield of copper(II) saccharinate product and if it does, will it raise or lower the actual yield: [experiment 4] Leaving some crystals behind in the beaker - Answers lowers the actual yield the reactant that is completely consumed during the reaction - Answers limiting reagent the amount of product that could be produced using a given amount of reactant. - Answers theoretical yield a small portion of a chemical species - Answers aliquot equation for moles - Answers moles = molarity x liters equation for molarity - Answers molarity = moles of solute/liters of solution the chemical species being added in a titration - Answers titrant Cedrick & Astrid titrated a 10.00 mL aliquot of grapefruit juice with a 0.171 M NaOH solution to the end point. The initial buret reading was 1.31 mL and the final buret reading was 16.82 mL. H3C6H5O7(aq) + 3 NaOH(aq) → Na3C6H5O7(aq) + 3 H2O(l) What is the volume of NaOH titrated? What is the mass of citric acid in the juice sample? - Answers - 16.82 mL - 1.31 mL = 15.51 mL - molarity x volume titrated (15.51) = moles moles / 3 moles NaOH moles x molar mass of citric acid = 0.170 g Cedrick & Astrid titrated a 10.00 mL aliquot of grapefruit juice with a 0.171 M NaOH solution to the end point. The initial buret reading was 1.31 mL and the final buret reading was 16.82 mL. They calculated that there was 0.1698 g of citric acid present in the juice sample.What is the amount mg of citric acid present per mL of juice? - Answers - 0.1698 g / 1000 mg x 10 mL = 17.0 mg / L For the error, indicate if the error will affect the mg of citric acid present per mL of juice, and if it does, will it raise or lower the value of the mg citiric acid/ mL of juice? Adding 6 drops of phenolphthalein instead of 3 drops - Answers no effect For the error, indicate if the error will affect the mg of citric acid present per mL of juice, and if it does, will it raise or lower the value of the mg citiric acid/ mL of juice? Over-titrating the end point (adding too much titrant) - Answers raises the value of mg citric acid/mL juice Will use of a lower Molarity value of DCIP affect the calculated mg of Vitamin C? - Answers Decreases the value of mg of Vitamin C Will use of a lower Molarity value of ascorbic acid affect the calculated Molarity of DCIP? - Answers Lowers the value of Molarity of DCIP equation for the moles of analyte - Answers M(titrant) x equiv. pt. vol. titrant x (mol analyte/ mol titrant) = moles analyte predict the conductivity of NH2CH2CH2NH2, a weak base. - Answers weak electrolyte predict the conductivity of H3BO3, a weak acid - Answers weak electrolyte Is H2SO4 a strong or weak acid? - Answers strong acid/strong electrolyte Is BaSO4 a strong/weak/nonelectrolyte? - Answers nonelectrolyte pressure equation - Answers P(total) = PO2 + PH2O ideal gas law - Answers PV=nRT What is the Molarity of the Ba(OH)2 solution if a 12.50 mL aliquot of the Ba(OH)2 solution required 15.20 mL of a 0.108 M H2SO4 solution to reach the equivalence point? - Answers 15.2 mL x 0.108 M x (1/1000) = 0.00164 0.00164 x (1/15.20) x 1000 mL = 0.131 M In this experiment, you will be using and measuring various chemical species by a variety of units. Which units of measure is used for the temperature of water? - Answers Kelvin In this experiment, you will be using and measuring various chemical species by a variety of units. Which units of measure is used for the volume of O2(g)? - Answers mililiters In this experiment, you will be using the gas constant, R. Which unit is NOT found in R? - Answers Molarity dilution equation - Answers Conc(stock) x Vol(stock) = Conc(dilute) x Vol(dilute) absorbance equation - Answers slope x concentration ppm equation - Answers ppm = mg of solute/L of solution A calibration plot of absorbance vs. concentration (ppm) was obtained with standard known Red 40 dye solutions. The slope of the best-fit straight line of the plot is 0.038 ppm- 1 The absorbance of the dilute unknown sports drink was 0.64 What is the concentration of thisdilute unknown sports drink? - Answers 16.8 ppm An 10.0 mL aliquot of a 125 ppm stock Red 40 dye solution was diluted to a final volume of 25.0 mL with deionized water. What is the concentration of the dilute Red 40 dye solution (in ppm)? - Answers 50 ppm A 75.0 mg sample of Red 40 dye was dissolved and diluted to a final volume of 1.25 L with deionized water. What is the concentration of the Red 40 dye solution in ppm? parts per million (ppm) refers to 1 mg of solute in 1.0 L of solution (mg/L) - Answers 60 ppm Ozzie wanted to do another experiment with a stronger H2O2 solution to check the accuracy of the experiment by calculating the theoretical volume of O2(g) it would produce. Then he could compare his experimental volume of O2(g) to the theoretical volume of O2(g). He used 5.20 mL of 2.21 M H2O2 and the partial pressure of O2 was 0.9341 atm and the temperature was 298.35 K. What volume of O2(g) could he theoretically produce (in mL)? - Answers 150 mL An unknown compound Z dissolves completely in water, yet does not dissociates into ions. Which conductivity classification do you predict for Z? - Answers nonelecrolyte An unknown compound Y dissolves completely in water and partially dissociates into ions. Which conductivity classification do you predict for Y? - Answers weak electrolyte An unknown compound X dissolves completely in water and dissociates completely into ions. Which conductivity classification do you predict for X? - Answers strong electrolyte in experiment 3, what color/state was Cu? - Answers reddish copper/solid in experiment 3, what color/state was CuSO4? - Answers bright blue/aqueous solution in experiment 3, what color/state was Cu(OH)2? - Answers dark blue/solid in experiment 3, what color/state was Cu(O)? - Answers black(dark brown)/solid Which statement best explains what happens to the percent yield if the crystals (product) were washed with hot water? - Answers The actual yield will decrease since part of the product will dissolve and not be recovered as a solid.Since actual yield is in the numerator, the percent yield will also decrease. Nick and Kel reacted 2.80 g of NiCl2· 6 H2O with 7.00 mL of 4.00 M C2H8N2. They recovered 2.40 g of product, [Ni(C2H8N2)3] Cl2.At the end, the filtrate was a dark blue solution. The litmus test on the filtrate solution left the red litmus paper unchanged in color. NiCl2· 6 H2O + 3 C2H8N2 → [Ni(C2H8N2)3]Cl2(s) + 6 H2O Molar Mass of NiCl2· 6 H2O is 237.69 g/mol Molarity of C2H8N2 is 4.00 M Molar Mass of product, [Ni(C2H8N2)3]Cl2(s) is 309.90 g/mol Limiting reagent? Excess reagent? Actual yield? Theoretical yield? - Answers C2H8N2 NiCl2 6H2O 2.40 g 2.89 g In experiment 4, what color is expected for the filtration if NiCl2·6 H2O is the limiting reagent? If C2H8N2 is? - Answers pink - NiCl2·6 H2O dark violet - C2H8N2 For the procedural error, indicate if the error will affect the actual yield of [Ni(C2H8N2)3]Cl2 product and if it does, will it raise or lower the actual yield: Weighed the product while the product was still wet - Answers Raises the actual yield For the procedural error, indicate if the error will affect the actual yield of [Ni(C2H8N2)3]Cl2 product and if it does, will it raise or lower the actual yield: Rinsing the product with 10 mL of acetone instead of 5 mL in step 11 - Answers No effect Here is useful information for the questions below.Select your answers from the pull-down menus. C12H7O2NCl2 is abbreviated as DCIP Molar Mass of C6H8O6(s) is 176.14 g/mol C6H8O6(aq) + C12H7O2NCl2(aq) → C6H6O6(aq) + C12H9O2NCl2(aq) Ace, Corby & Astrid dissolved 0.0486 g of C6H8O6 in a 100.0 mL volumetric flask and filled it with deionized water to the mark. What is the Molarity of this standard solution of C6H8O6 ? An 8.50 mL aliquot of the standard C6H8O6 above required 17.95 mL of DCIP to reach the endpoint. What is the Molarity of the DCIP solution? A 7.00 mL aliquot of pear juice required 24.70 mL of the same DCIP solution (from above) to reach the end point. How many mg of C6H8O6 are present in the aliquot? - Answers 2.76 x 10-3 M 1.30 x 10-3 M 5.68 mg