Lab Final Review

Lab Final Review - CHEM 120 LAB FINAL EXAM REVIEW * *Some...

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Unformatted text preview: CHEM 120 LAB FINAL EXAM REVIEW * *Some study tipsM Work over all your pre-lab assignments, pre-lab quizzes, and lab questions from the semester. Be sure you know, in general, what you did in each of the labs and why you did it. Don’t focus on every little detail of the experiments, but be sure you have a basic understanding of the principles of each experiment. Here are some examples of the types of questions you could see on the lab final. 1. 10. 11. Draw a HOT Bunsen burner flame and label its parts. What is the color of this flame? Describe the difference between a HOT flame and a COOL flame. Draw a picture of the following: beaker, test tube, filter flask, pipet, graduated cylinder, Erlenmeyer flask, funnel, stirring rod, crucible. In what type of bottle is each of the following found in our lab? 6M sulfuric acid, conc. HCl, 6M NaOl—l, conc. Nitric acid Name the lab disposal location for each of the following: Cu(II) ion, acetone, excess conc. HCl, broken beaker, boiling chips Describe what happens (observations) when: a. Anunonium nitrate is added to sodium hydroxide b. Zinc chloride is added to silver nitrate c. Hydrochloric acid is added to sodium hydroxide d. Magnesium solid is added to nitrogen gas Write net ionic equations for the reactions in question 5. Metals A and B have a molar mass of 75 and 90, respectively. Calculate the specific heat of each metal. State the ideal gas law and give the value and units for the constant R. The mass of a beaker is 5.138g. After 2.00mL of an unknown is pipetted into the beaker, the combined mass is 9.361g. From the data, determine the density of the unknown compound. (Set up only, no calculations) What is the formula of the potassium alum prepared in the lab? In the molar mass of a volatile liquid experiment, how would the determined molar mass of the compound be effected if the outside of the flask was not dried after vaporizing the liquid? 12. 13. 14. 15. 16. 17. 13. 19. 20. 21. 22. 23. 24. 25. 26. 27. The density of a metal is 15.5 g/mL. If 30.5g of the metal is added to a graduated cylinder that contains 6.5mL of water, what will be the final volume reading of the volume in the cylinder? List 4 ways to identify the occurrence of a chemical reaction. List three types of safety equipment found in our lab. Will the alum prepared in our lab give a positive test for nitrate ion? What is the function of a centrifuge? Describe how to balance a centrifuge. Describe how to obtain about ten drops of concentrate sulfuric acid in the lab. Write the expression to soIve for the volume of a solid, given its weight and density. Name an insoluble chloride containing compound. Name four physical methods for separating the components of a mixture. A chemist determines the mass of a piece of copper to be 0.844g. The chemist proceeds with a series of reactions which dissolves the copper and then finally after another series of reactions, brings the copper back out of solution as copper metal. This time the chemist finds the mass of the copper metal is only 0.63 3g. What is the Chemist’s percent recovery? What is a supernatant? A chemist wanted to determine the empirical formula of magnesium oxide. The chemist started with an initial mass of 2.43g of solid magnesium, heated the metal until it was all ash and found the mass of the ash (magnesium oxide) to be 5.63g. What is the empirical formula of magnesium oxide based on this data? Is the dissolution of a salt usually an endothermic or exothermic process? What is the sign on AH for this dissolution? In the calorimetry lab, explain why the extrapolated temperature was used to determine the maximum temperature of the mixture, rather than the highest recorded temperature in the experiment. What is the active ingredient in aspirin? Why is it not ingested directly? Is acetylsalicylic acid more soluble in ethanol or water? If the yield of your dry aspirin in experiment 29 was greater than 100%, what could you do to obtain a mnrn tannin-Qin- {1:111:19 Chemistry 120 Lab Final Study Sheet 1. Where, in our labs, would you find: a. Graduated cylinders b. Heavy metal waste c. Wire gauze d. Safety shower e. Concentrated sulfuric acid 2. What color will blue litmus paper turn in a basic solution? .‘ 3. In the lab, do we typically use luminous or nonluminous flames? \Nhat color is it? How many cones does it have? 4. How is temperature and volume related, and what law does that correspond to? 5. Complete and balance: a. COClz(aq) + AgN03(3q) -) b. NaOH(aq) + NH4Cl(aq) —) 6. What color are cobalt solutions? 7. True or false: Copper metal reacts with zinc ions to give zinc metal and c0pper(ll) ions. 8. \Vhat are clay triangles used for in the labs? ‘9( In chromatography, when enhanced with K4[Fe(CN)6], what is the color of copper(ll) ions? 3 10. \Vhat chemical do we use in the labs to detect the present of starches? 11. \Vrite the names ofthe reactants and products in the synthesis ofaSpirin. (Note: Do not include the catalyst.) 12. Will the buming ofMg in open air (very bright flame) affect the mole ratio ofO to Mg in the analysis of magnesium oxide? If so, how? 13. For metals, what general equation did Dulong and Petit come up with for the heat capacity? 14. What centrifuging, what is a supernatant? 15. For the reaction of sodium carbonate and hydrochloric acid, write the follow: a. The molecular equation b. The ionic equation c. The net ionic equation 16. Name two other pieces of safety equipment that are there in the lab, other than safety goggles? 17. How do we check the purity ofa synthesized compound, such as aSpirin? 18. What types of ions compose an alum? 19. \Vhat was the limiting reagent in the alum experiment? 20. \Vhat is the density ofa liquid A with mass 15.0 g and volume 75.0 mL? Is the density of liquid A higher or lower than the density ofliquid B, which has a mass of 10.0 g and volume of 60.0 mL? - 21. How many significant figures would the answer ofthe previous problem have? 22. Given the ideal gas law, algebraically solve for the molar mass. 23. In °C, what is absolute zero? 24. Name 4 ways that you know a reaction happened? 25. What is the meniscus and how is it read? Draw a picture to show this. CHEMISTRY 120 LAB REVIEW: What have you learned this semester? Solubility Rules Percent Yield/Theoretical Yield pH Detection Chemical Formula of products you made in lab STP Activity Series Parts of a flame Densny Vapor Pressure Ideal Gas Law Net—ionic equations Endothermic/Exothermic Reactions Calorimetry Copper Cycle Lab Safety Location of Equipment and Waste Disposal Significant Figures Chemical Equations Aspirin Synthesis Identification of Lab Equipment Types of Waste Disposal Factors in Designing an Experiment Proper Handling of (Hazardous) Chemicals Molecules / Atoms vs. Ions Specific Heat/ Heat Capacity More Notes: o Know safety rules and emergency procedures. o Be familiar with reagents used in the labs throughout the semester, particularly those that have special purposes, safety hazards, etc. 0 Can you name/write the formula for the products you have synthesized in lab? - KNOW the Solubility Rules! Notes from me on taking the final: You have heard the stories, so I made this to encourage you to study. Please do so and ask me questions before Tuesday. While I have not seen the exam, I am here to help. DO NOT LEAVE BLANKS! Answer to the best of your ability. I cannot give you partial credit if you leave the question blank. Good Luck! C-HEMlSTRY 120 SECTION UXB FlNAL EXAM ( LE - 2) M -12 SP 2007 Name/KEL/ TA/JQ—flg—r— Student lD No. Student Signature b. A student obtained 6.400 g of alum. She calculates the percent yield and finds it to be 80 percent, Calculate the theoretical yield. SHOW ALL WORK 6.91005? —- %Y: «fixmo ' TH: Ax/oa '- /——--—-></00 e g 3” _.__ v—‘ / z 7 80 2. a. in acids, blue litmus is [2 in color. b. Write the complete chemical formula of the alum that you prepared in the lab 6 50 6 [2 H20 3. Define a. hot "mew b. percentyield I (ACfl/AL YIELD) TWEQQETfCALj/Iw I X /00 3 aCllVilY $6065 OmelalsmméL/WW CF r wuch F20!“ dc meniscus fiOflfgogsz ft/gfidCL Qf A H.914!” e. vapor pressure otwater__L/ 5 A i ‘ ’— 2 :2 "J 7674/" calculate the molar mass ol e gas. 2: D x R/l I; )x T DSV 5. a. When aqueous solutions ol barium nitrate and ct irohtll) sulfate are mixed 3 white precipitate lzrms List all the ion 5 that are not involved in this reaction. 1 " l l fl F; + W3 4. A gas, at STP, has a certain/tensity value List_ including units. what is needed it One wants to O l c: b. H a glass beaker is substituted tor the styrcloam coffee cups in the calorimetry experiment~ ‘mll the tem- ‘* perature change in the calorimeter be greater or less for an exothermic reaction ? g E 6 \ane the lormula of the coEEer product (it any) lormed in these reactions Cu (OH), (aq) o Hydrochloric acid (aq) = Qg 022 CU (NO!)2 (aq) + Sulluric acid (aq) = i 1.3. ,2 1U; Cu (5) * Hydrochloric acid (aq) = NQ 8 EA; Hg. 52 CU (OH)2 (aq) + Sodium hydroxide (ad) = 01(5) § Nitric acid laq) = W 7‘ a. Name one (1) llammable chemical used this semester. ézaflwL g A g; EMA/E) b. in our labs, the lire extinguishers are located QM :2 215' MM; 8. 3. Which one metal, metal A or metal 8. has the smaller density, 64 000 g of metal Awith volume at 10 0 cm3 or 48.000 9 of metal B with volume of 60 mt. . SHOWALL WORK. H [)8 : 51: Egg—q- : {.00 .3: “ ' r—‘é _— __ . m .000 ' D ‘V’éft7‘zé'Wg/l/ :2 b, What is the correct number of sig. rigs. in the calculated density of metal A (above) 7 VHPEE 9. Using chemical names only, write the chemical equation tor the reaction used to prepare aspirin. swim/dc ACEfi'c SVWfl/c 5 A59”. ACEfic Act/‘0 + aux/WIDE Mp arc/gm + Nb 10. a. Write the formula of the products of the reaction behaeen sodium phosphate a No.62 ; @3/RWD2, b A mixture of an acid (aq) and copperfs) produces NO2 gas. The fcri'nu/a of the acid used is g 11. in the empirical formula experiment, suppose that the Mg is not polished. Would the reportej mCiE ratio Cf Mg / 0 be too hioh. too low. or una’ ifected bv this procedure ? 1% Explain Humvee I‘m/GE Ng- ZH/w Acmeay 727/625 12. a. in making aspirin, on chemical test reaoent M t / nd CCballlll) chloride. 514’s?— e of the reacting materials is a pot ential impurity in the product, Name the that you used in the lab to check this. Jay (m) 01‘ Lora/“.05 b. Vyrite the steps for the proper procedure to ob tain four (4) drops of a concentrated acid in ocrtaLS. m FVME map, Pat/.2 A HEW 4L: Au A «09AM 3:911:59. w/nr You/2 Purn‘c 020/0251, {WW/Dfl/fld 44 02am Rm 7771:: QFFFtE/i 13. Where, in our tabs, would you find the following items 7 a. litmus paper Cl/WUKES ' . w yam! b. glass only container EQQMT 25 m d. eyewash 0U 43ng [7.96 £767“! c, 6M nitric acid 3.5 $222 S I . . . - ' e_ unwersel indicator SC'iUthH—Wfia )2 produces an insolutte Pb product, wile the the ionic, (iii) the net ionic M 52ng + PA {was :: Pee/leave 96192,; 14. The reaction between copperftl) sulfate and beth3 following equations: (i) the molecular, (ii) 16 a. How would :ne distinguish between. aqueous solutions cichlcride ' ~ ca on and ofchtorine? 3y come 40/: Soc/away : (2‘ amaze-x ., e a properly adjusted dune“ Bar/‘5 COLQQ b. Descrit \ . I b. An all~blue~\.~.ith-no-cones Bunsen burner flame has a (lower, higher) len‘peiaiure it an an K all-blue~with~cones one. 19. Name and Give the Location of each of the three (3) liquid waste bottles in our lahs, 20. Draw and label (name) five (5) different lab non-glass . ;£$"1".a "-‘fé'fl‘f'23. ,_ the; v...“ ' I? ‘ items found in your lab locker. f _ r- ...
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Lab Final Review - CHEM 120 LAB FINAL EXAM REVIEW * *Some...

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