Prelab - CHM 112 Ten test tube mystery

In the conductivity test, _____________________ is going to result to a brightly lit light bulb. a. 70% v/v ethanol b. 1.0 M citric acid c. Mixture of 10.0 mL 1.0 M Mg(OH)2 and 10.0 mL 1.0 M HNO3 d. Glacial acetic acid

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 42. Primary Standard reagent used in standardization of 0.1N sodium hydroxide a. Sulfamic acid C. sodium carbonate KHP b. sodium bicarbonate d. 43.An analyst who determines the strength, potency and percentage purity of a drug or pharmaceutical product is performing: a. Special method C. d. Pharmaceutical assaying Identification test b. Pharmacopoeial test 44.Chemical analysis which determines the amount or percentage content of a certain component in a sample: a. Qualitative C. d. Proximate Ultimate Quantitative ܩ b.

Answer if true or false , if false, put the correct answer 1. Good primary standard needs to have side reactions 2. Buret is used to contain analyte 3. What are the 5 types of trytimetry

LabQuest 17 DATA TABLE Trial 1 2 3 4 5 6 Concentration (mol/L) 0.080 0.16 0.24 0.32 0.40 Unknown number Absorbance (no units) 0.2711 0.437 1.480 1.932 2.171 0.3 DATA ANALYSIS 1. Describe an alternate method for determining the molar concentration of your unknown sample of copper (II) sulfate solution, using the standard data.

help me please

1. Bromothymol blue indicator is color yellow in an acid solution and ______ in a basic solution. A. Clear B. Blue C. Red D. Violet How much time was taken for the disappearance of blue-black color to test tube 2 with 20 degrees Celsius temperatue? A. 6mins B. 4mins C. 2 mins D. The color did not disappear

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 30. Indicator used in the assay of diluted Phosphoric acid. a. thymolphthalein d. methylene blue methyl orange b. phenolphthalein e. C. methyl red 31. Materials to be sampled include the following, except: a. Records C. Final products Raw materials b. Intermediate products d. 32.Color of methyl orange in acidic medium a. Yellow C. Blue b. Colorless d. Pink 4

PLS HELP ASAP ON ALL ASKED QUESTIONS AND SHOW ALL WORK

15 16 17 18 19 20 21 22 23 24 25 26 27 An aqueous solution at 25 °C has a OH concentration of 1. x 10 "M. Calculate the H,O' concentration. Be sure your answer has 1 significant digits. -10 M dh Submit Assignment Continue MacBook Air F12 F9 F10 888 O00 FB 30 F7 F5 F6 esc F4 F2 F3 F1 & @ # $ %3D 4 5 7 8 9 2 3

1. _________________is used in the process of paper chromatography.  A. Filter Paper B. Whatman Paper 2. In the dilution formula, N1V1=N2V2, N2 is ________.  A. normality the concentrated solution B. normality of the desired solution 3. The reactivity of the alkaline earth metals in the decreasing order of __________.  A. Be, Mg, Ca, Sr, B. Sr, Ca, Mg, Be 4. The chemical reaction of Br H20 + n-hexane produced __________.  A. two layers of colorless solution B. orange and yellow layered solution C. violet and reddish brown layered solution 5. The _________ is used to transfer solid substances from container to another.  A. Spatula B. Pippete C. Stirring rod

7. We have 85 mL of 25% EDTA solution and need to use all this solution to make a 0.25% solution. The molecular weight of EDTA is 292.44. Indicate how much of the solution we can make. Show your work. a) What is the stock concentration? b) What is the final concentration? c) What is the starting volume? d) What is the final volume?

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Can you test ZnO with litmus paper even though it is insoluble in water? If not then does this apply to all chemicals that are insoluble in water or can you dip litmus paper into the vial containing the chemical covered with water?      Please type answer note write by hend

Calculate the total concentration of ions( Na+ and Cl-) in a solution prepared by diluting 10mL of 0.05M NaCl to a total volume of 10mL with deionized (DI) water.   Enter your answer using 2 decimal places.       Answer:   ___________ M

Select one for each box

I need help on questions 2-8?

Which of the following ionization techniques are combine with TOF analyzers? I. MALDI II. ESI III. EI a. I and II b. Only I c. I, II and III d. II and III e. I and III

X Untitled Noteb... X Chem_30_Uni... X 1 ★ Chem_30_Uni... X Chem_30_Uni... a. Use a chemical reaction to explain how aqueous ammonia can create a basic solution. Kb for ammonia 1.8x10-5 Answer: X Chem_3C

1. Select a product from the stock shelf and transfer the liquid to a test tube. 2. Select a paper pH test strip. Record the color of the test strip in the data chart. Transfer it to the same test tube. 3. Note any color change of the paper and record in the data chart. 4. Drag the test tube containing the test strip over to the color chart to determine the pH range indicated by the paper. Record your results. 5. Record your conclusion about whether the substance is an acid, a base, or a neutral substance. 6. Repeat for all substances.

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 72. The experimental way of determining when equivalent amounts of reactants have reacted together is: a. Titration C. Standardization Equivalence point b. Stoichiometric point d. 73. Quality control department where new assay method is being develop for in-house use a. Material Inspection Section d. Quality Coordinating office b. Specification & Analyrtical Development e. Analytical Laboratory section C. Biological Testing Laboratory 74.Sulfuric acid is a a. Diprotic acid C. Tetraprotic acid Monoprotic acid b. Triprotic acid d.