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Newest Laboratory Techniques Questions

1. Chem Tech makes paper cones used to filter liquids in lab experiments. To make the paper cones, the company starts with the net
   1. 1 answer
   2. asked by p
   3. 34 views
2. What if the thermocycler did not reach the required temperatures? What if you cross-contaminated between samples?
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   2. 19 views
3. Lily broke a cell sample into 99 batches, each weighing 9, point, 3, times, 10, to the power minus 5 9.3×10−5 grams. How much
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   2. asked by UnicornSparkles
   3. 40 views
4. What are the assumptions we make when using the gas collection apparatus in this lab? (Select all that apply)• Percent
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   2. 39 views
5. An experiment requires 13.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25° C. What volume of cyclohexane should be
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   2. 34 views
6. What happens to the volume of liquid aspirated by a micropipette if you depress the plunger to the other (incorrect) position
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   2. 49 views
7. Question 3 options:7.50 What volume of liquid would be transferred if the micropipettor is set as indicated by the window? Make
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   2. 32 views
8. what is the purpose of the volume in pipette
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   2. 31 views
9. Who do chemists tie copper wire together to hold parts of the setup
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   2. 39 views
10. Types of balance in lab
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    2. 21 views
11. Lab: Measuring pHAssignment: Lab Report
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    2. 17 views
12. Dissolve 0.1gm if dextrin in 2cc if water. To this dilute solution in a test tube, add 2 drops of molischs reagent and shake.
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    2. 89 views
13. Step 1 of preparing a standard solution is
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    2. asked by Abdulrazak umar Usman
    3. 77 views
14. Why is a control test tube of water used?
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    2. 40 views
15. Briefly explain separation funnel
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    2. asked by Oluwademilade
    3. 92 views
16. What's your Laboratory observations using a 10ml graduate cylinder measure 10.0ml of the acid solution and transfer the solution
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    2. asked by Nathaniel Benson
    3. 82 views
17. Write a laboratory report on standardization of NaHCO3 using a 10ml graduate cylinder measure 10.0 ml of the acid solution and
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    2. asked by Nathaniel Benson
    3. 81 views
18. What is serial dilution and provide an example you might use in the laboratory
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    2. asked by Kelvin
    3. 144 views
19. How do we measure solubility of substance in laboratory
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    2. asked by Kelvin
    3. 75 views
20. A student is performing a Benedict’s test on an unknown substance. The student adds the reagent (the chemical required to make
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    2. 97 views
21. You are worried that a solid substance has to evolved in a beaker of water in a lab what way could you separate the substance
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    2. 75 views
22. Describe how to prepare a pure sample of çalcium chloride in the laboratory
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    2. 185 views
23. Explain how one is supposed to smell the product(ester) in the laboratorium
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    2. asked by Lutho
    3. 124 views
24. Function of a condenser in simple distillation
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    2. asked by Romeo
    3. 139 views
25. How to find solvent volume for recrystallization?
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    2. asked by Momna
    3. 142 views
26. Propose a method for how you might accurately measure the boiling point for a material that decomposes slightly below its
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    2. asked by Mark
    3. 406 views
27. Describe how you would prepare dry sample of calcium chloride in the laboratory
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    2. asked by Andrew
    3. 1,133 views
28. An experiment in your laboratory requires exactly 500mL of 0.0200M solution of Na2CO3. You are given solid Na2CO3, distilled
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    2. asked by Blessings
    3. 1,010 views
29. One student calibrated a 50-mL burette by using the mass of water delivered. The student used an analytical balance which was
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    2. asked by el
    3. 756 views
30. Describe the preparation of 100 ml 6.00 M HCL acid from a concentrated solution that has a specific gravity of 1.18 and 37/100
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    2. asked by navoda
    3. 1,986 views
31. How would you obtain a sample of a pure iodine from a mixture of iodine and lead (ii) sulphate.
    1. 3 answers
    2. asked by Lexus cotricks
    3. 3,376 views
32. How to prepare 0.5m of HCL using 500ml standard flask
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    2. asked by victor
    3. 641 views
33. Discuss three unavoidable sources of error in Part 1(the synthesis of the crystals) of this experiment and identify the major
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    2. asked by Jake
    3. 901 views
34. Why we cool the tube in anthrone test then observe the color
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    2. asked by Zahraa
    3. 428 views
35. We used a buret today, and I don't get how to calculate volume. I have an initial reading of 49.97 and a final buret reading of
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    2. asked by Anonymous
    3. 1,590 views
36. Suppose water contained some harmful volatile substance. How could you easily remove the volatile substance in a laboratory?
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    2. asked by Z
    3. 948 views
37. Why was NaOH used in an Biuret test to run a experiment
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    2. asked by rajeana
    3. 484 views
38. Why is filter paper a poor material on which to powder a solid before introducing it into a melting tube?
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    2. asked by charlotte
    3. 1,313 views
39. 2) why should you use a minimum amount of water to rinse the conical vial while transferring the purified acetaminpophen to the
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    2. asked by reem
    3. 785 views
40. A student is instructed to standardize an approximately 2.5N KOH solution using a 0.500N H2SO4 stock solution. Describe the
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    2. asked by Candice
    3. 615 views
41. I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve
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    2. asked by Ashley
    3. 614 views
42. Describe the correct technique for reading the meniscus of a solution in the buret.
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    2. asked by Josh
    3. 1,522 views
43. What are the most common sources of error in weighing solid samples ?
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    2. asked by Neda
    3. 738 views
44. filter paper is a poor material on which to powder a solid before introducing it into a melting tube .explain why?
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    2. asked by inise
    3. 632 views
45. what are the sources of error in preparing ester lab?
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    2. asked by maggi
    3. 1,490 views
46. What type of prac do you think you need to use a filter funnel and filter paper.please help quickly
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    2. asked by raj
    3. 539 views
47. A student obtained a clean, dry glass- stoppered flask. She weighed the flask and stopper on an analytical balance and found the
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    2. asked by Alan Anderson
    3. 2,301 views
48. Determine the volume of diluted nitric acid d= 1.11g/ml, 19% hn03. That can be prepared by diluting with water 50ml of conc.
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    2. asked by Fai
    3. 1,034 views
49. When weighing liquid ethanol, why do you have to place water in the beaker prior to adding the ethanol to that same beaker?
    1. 2 answers
    2. asked by Chem
    3. 551 views
50. Why is it suggested you use weighing paper or a watch glass instead of filter paper onwhich to allow a sample to dry? Please
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    2. asked by Maria
    3. 683 views
51. How to separate and isolate the components of barium sulfate?
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    2. asked by Hope
    3. 674 views
52. Laboratory preparation of carbon dioxide?
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    2. asked by Lalan patel
    3. 428 views
53. The forward primer was provided by the manufacturer as a lyophilized powder. If the manufacturer delivers 127.4 nmoles of this
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    2. asked by JEQPCR
    3. 1,647 views
54. 30g of the palm shell were mixed with 15ml H3PO4 and 100ml of distilled water in a 250ml conical flask.The concentration of
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    2. asked by Merlina_Lyn
    3. 578 views
55. do you know how much drops of dcpip is required to make .9 , .6 , 1.1 and .8 cm squaredmy partner and i frogot to write down the
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    2. asked by Anonymous
    3. 426 views
56. describe basic steps to take re-crystalizing synthesized aspirin. using two solvents to perform this task (ethanol and
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    2. asked by morgan
    3. 839 views
57. why is it important to add 1M HCl dropwise to the crucible?
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    2. asked by SA
    3. 998 views
58. I'am unable to identify which is upper meniscus and lower meniscus while taking a solution in burette.please tell me how to
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    2. asked by J.Nandhini
    3. 638 views
59. An Erlenmeyer flask containing a hot solution is not tightly stoppered to prevent solvent loss during cooling. give reasons.
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    2. asked by david
    3. 1,565 views
60. Carborundum (silicon carbide) boiling chips are better than calcium carbonate chips in the recrystallization of an unknown,why ?
    1. 2 answers
    2. asked by david
    3. 1,627 views
61. Please can anyone help me with the following:Filter paper is a poor material on which to powder a solid before introducing it
    1. 4 answers
    2. asked by Ahana
    3. 1,564 views
62. Please can anyone help me with the following:Filter paper is a poor material on which to powder a solid before introducing it
    1. 1 answer
    2. asked by Ahana
    3. 455 views
63. During an experiment involving separation, you forget to label your beakers and you are unsure of which beaker contains the
    1. 2 answers
    2. asked by Rachel
    3. 869 views
64. How would you obtain a sample of the salt potassium chloride?
    1. 1 answer
    2. asked by Muhammad tanvir hussain
    3. 710 views
65. what is the purpose of using deinonized water to adjust the Spec 20 to 0 absorbance?
    1. 6 answers
    2. asked by sibi
    3. 1,528 views
66. Why is unnecessary to measure precisely 25 ml of unknown acid into the beaker?
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    2. asked by Veronica
    3. 466 views
67. How can a mixture of ammonium chloride,KCl,lead(2)chloride could be separated in the laboratory
    1. 4 answers
    2. asked by Michael
    3. 600 views
68. I need help with a lab report on extraction of iodine by dichloromethane, please help!
    1. 2 answers
    2. asked by Delia
    3. 798 views
69. For Extraction using a separatory funnel, what is poured into the funnel first the solution that is to be extracted or the
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    2. asked by Jasmin
    3. 924 views
70. why must not the condensed water drip into the flask?
    1. 2 answers
    2. asked by felaa
    3. 1,478 views
71. lab question: explain why different masses of precipitate were obtained for test tube IV and V?
    1. 6 answers
    2. asked by ekauwen
    3. 1,251 views
72. how is bumping avoided in the preparation of a hot water bath
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    2. asked by Anonymous
    3. 804 views
73. We did a lab separating out the components of a mixture. One of the lab questions is "The weight of naphthalene was obtained by
    1. 2 answers
    2. asked by Martha
    3. 1,257 views
74. I did a lab about melting point. It is asking me for the purity of the compounds?How do I find it? Do I use melting points or
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    2. asked by Yoo
    3. 979 views
75. what test will you perform to determine when you have added sufficient NaOH solution to the reaction mixture in reaction 2
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    2. asked by erlicia
    3. 645 views
76. extraction lab:suppose that aqueous and organic (diethyl ether) layers were not mixed thouroughly predict the effect that this
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    2. asked by jay
    3. 594 views
77. What is the purpose of removing all the precipitate from inside a beaker?
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    2. asked by Emma
    3. 1,280 views
78. What is the purpose of removing all the precipitate from inside a beaker?
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    2. asked by Emma
    3. 707 views
79. In a laboratory setting, how would you determine if a compound was a hydrate?
    1. 2 answers
    2. asked by Astrid
    3. 1,630 views
80. Assume that during an extraction experiment you have lost track of which layer is the aqueous layer. How could you determine
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    2. asked by Carrie
    3. 1,865 views
81. What chemical sometimes used to make the specimen visible
    1. 2 answers
    2. asked by Anna
    3. 1,000 views
82. Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.
    1. 1 answer
    2. asked by kim
    3. 698 views
83. What is a disadvantage of using pH indicators?
    1. 3 answers
    2. asked by *Sara*
    3. 807 views
84. What is EDTA exactly and why do we use it in lab setting? I researched but having a little hard time understanding the concept.
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    2. asked by Matt
    3. 732 views
85. I did a lab where I had to decompose the compund patassium cholorate (KClO3)by heating,I had to weight the test tube then the
    1. 2 answers
    2. asked by Sheryl
    3. 1,332 views
86. What approach do you suggest using to prevent your water sample from cooling off before you start your measurements?
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    2. asked by Lilit***
    3. 734 views
87. I performed a TLC of plant pigments in my lab class with a solvent of petroleum ether/ acetone (7:3) and used a silica gel
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    2. asked by Veronica
    3. 790 views
88. <b>The only reason I asked about the balance is that most analytical balances in use in schools weigh to the nearest 0.1 mg
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    2. asked by ~christina~
    3. 590 views
89. You have a green solution and you are trying to read the absorbance. However, when you use the spectrophotometer at 680mm, you
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    2. asked by Anonymous
    3. 463 views
90. Why is it wise to clean the aluminum?Why is the reaction done in the hood? Why must suspended solids be removed from the basic
    1. 1 answer
    2. asked by Josh
    3. 539 views
91. Why do you need to remove the chromatogram before the solvent reaches the upper edge?
    1. 1 answer
    2. asked by Anonymous
    3. 1,106 views
92. help with the chem lab. the molecular of a volatile liquid.
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    2. asked by Bmt
    3. 561 views
93. I used a filter paper that was too large for the Hirsch funnel and had tofold it up around the edges. Why is it bad to fold the
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    2. asked by Cecilia
    3. 822 views