2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?
Q: 2.5 100- 80 60 40 20 0 4000 STRANSMITTANCE O=C-H saturated C-H 3500 3.5 3000 N-H alcohol O-H 4 4.5…
A: 3300 cm-1 is N-H stretch, 3050 cm-1 is sp2 C-H stretch, 2900 cm-1 sp3 C-H stretch, 1620 cm-1 C=C…
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A: The rate equation for the given reaction is,…
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Q: If the concentration of Cu 0.5-80 ppm What are the ranges for kg of Cu present per metric ton?
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Q: Determine the pH of a buffer that is 0.25 M NH3 and 0.15 M NH4CI. The value of pKb for NH3 is 4.75.…
A: we need to complete the given table and find pH
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A: During writing formula of compounds . First write metal symbol then ligand with their number and…
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Q: Chemistry Would both of these reactants produce the product molecule? If so, would there be a…
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Q: 10. How many grams of silver oxide are needed to react with 7.9 g of hydrochloric acid to produce…
A: Ag2O + 2HCl = 2AgCl + H2O Molar mass of ; Ag2O : 107.87×2 + 16 = 231.7 g/mol HCl : 1 + 35.45 =…
Q: 5. (a) The Mossbauer effect depends upon the recoilless emission of a y-ray. How important is it to…
A: This Question is based upon Mossbauer Spectroscopy.
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A: We have to predict the volume of acid needed.
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A: we need to calculate cell potential for the given cell
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Q: ionic compound NaCl CrF4 FeCl₂ MnS cation anion Na CI 0 0 0
A: An ionic compound AxBy dissociates as: AxBy → xAy+ + yBx- So, the cation is Ay+ and the anion is…
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Q: مهله Benzil NH₂ NH₂ NaOH/ethanol -NH NH 5,5-diphenylhydantoin (Dilantin)
A: Step 1 : Benzilic acid rearrangement but here nucleophile is NH-. Then followed by intramolecular…
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Q: A photometer with a linear response to radiation gave a reading of 690 mV with a blank in the light…
A: %Transmittance can be calculated as: %T=PP0×100=VV0×100 =169 mV690 mV×100…
Q: 1. How many acetic hydrogens are in each of the following compounds? i of 0,4-01-8-0₁, 11 III IV II.…
A: I. We have to tell the number of acetic hydrogen is present in the given molecules. Acetic hydrogen…
Q: what are advangtage and disadvantage of using an Atomic Force Microscopy and explain each
A: Atomic force microscopy is a technique by which we study the different type of surfaces like…
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A: To calculate moles of solution , we would need to calculate volume of solution. For this we would…
Q: a calorimeter containing 110. g of 5.0 °C. The final temperature of the ation is 19.3 °C. The heat…
A: From energy conservation , Heat lost by metal = heat gain by water Mass of water = 110 g c = 4.18…
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Q: 7. Arrange the following acids in the increasing order of their solubility in water: p- CIC6H4COOH,…
A: In the given question we have to arrange the following acids in the increasing order of their…
Q: Consider the following reaction and its equilibrium constant: 4 CuO(s) + CH4(g) = CO2(g) +4 Cu(s) +…
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Q: Draw the major nitrogen-containing organic product(s) of the reaction shown. O O H₂NCHCNHCHCOCH3 1.…
A: Note : ester hydrolysis is done by NaOH. Above peptide molecule is having ester group. This ester…
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Q: What set of reagents can best accomplish the following transformation? OH ? A) Cl₂, hv B) Cl₂ in H₂O…
A: The reagent that can be accomplish in the following transformation is:
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Q: 2. [A] = day of birth [B] = month of birth I was born December 8th, so for me [A] = 8 [B] = 12 Use…
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Q: Calculate Ecell at 25 °C for the following redox reaction when the concentrations are (a) [Co²+] =…
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Q: Label the components of a hydrogen‑oxygen fuel cell.
A: Hydrogen-oxygen fuel cell is an electrochemical cell that convert chemical energy ( energy produced…
Q: The heat of vaporization AH, of benzene (CH) is 44.3 kJ/mol. Calculate the change in entropy AS when…
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A: Let us discuss the question step by step.
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Q: 3. Why do we consider carboxylic acids as acids?
A: Carboxylic acid contains -COOH group.
Q: Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the…
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Q: Salt bridge T entration cell similar to the one shown is composed of two Zn electrodes and solutions…
A: As both compartment consists of same electrode. So it is concentration cell. E° = 0 Q = 0.106/0.608…
Q: What is the electron pair geometry, lewis structure, molecular geometry, and hybridization ofCO3^2-?…
A: It is intermixing of comparable atomic orbitals to produce identical hybrid orbitals .
Q: Fill in the missing words Provide IUPAC name of the following compound below: Check
A: IUPAC Nomenclature of Alkane Select the longest and continuous carbon chain (containing…
Q: What is the pH of 0.1000 M Na₂HPO4? (K₁2=6.2x10-8, K3=4.8x10-13) What is the pH of 0.1000 M Na3PO4?…
A: The solutions considered are 0.1000 M Na2HPO4 and 0.1000 M Na3PO4. The question requires to…
Q: 8 H₂0 HCI Br "Br a Proton transfer 9 E2 Elimination d Radical chain addition Electrophilic addition…
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Q: 2. Why are aldehydes and ketones relatively weaker than alcohol in the context of hydrogen bond…
A: Since you asked multiple image questions so as per Q&A guidelines of portal I solved first…
Q: 4) Fill in the appropriate starting materials, reagents or products in the following reactions. OH…
A: In this question we have to tell the product of the reaction.
Q: Q3 :- What is the hydrogen ion concentration in a solution that has a pOH = 7.5?
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- A researcher has developed a new analytical method to determine the percent by mass iron in solids. To test the new method, the researcher purchases a standard reference material sample that is 2.85% iron by mass. Analysis of the iron standard returns values of 2.75%, 2.89%, 2.77%, 2.81%, and 2.87%. Are the results of the new method significantly different from the standard reference sample? (Hint: Use Confidence Interval)(b) Potassium nitrate was synthesized in an experiment using 10 mL of nitric acid and excess potassium hydroxide. The mass data obtained from the experiment is shown in Table 1 below. Given that the percentage yield of potassium nitrate was 88.3 %, calculate the concentration (% m/v) of the nitric acid used in the experiment. Table 1: Mass data for the synthesis of potassium nitrate from nitric acid and potassium hydroxide Mass of clock glass and crystallized potassium nitrate/ 45.55 Mass of empty clock glass/ g 39.18Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?
- 7. 22 This question is about several salts. (a) A hydrated salt, compound A, is analysed and has the following percentage composition by mass: Cr, 19.51%; CI, 39.96%; H, 4.51%; O, 36.02%. Calculate the formula of compound A, showing clearly the water of crystallisation. Show your working. formula of compound A = (b) A student carries out an experiment to determine the amount of water of crystallisation in the formula of another hydrated salt. The student intends to remove the water by heating the hydrated salt. A diagram of the apparatus used by the student is shown below. crucible pipeclay triangie The student adds the hydrated salt to the crucible and weighs the crucible and contents. The student heats the crucible and contents and allows them to cool. The student weighs the crucible and residue. The student's results are shown below. 16,84 Mass of crucible + hydrated salt/g 16.26 Mass of crucible + residue after heating/gHow is accuracy and precision related to errors incurred in the chemical analysis?1. Explain both precision and accuracy as they pertain to chemical measurements. 2. Why would you use the method of standard addition to calibrate a measurement instead of a calibration curve?
- An analyst performed an analysis of a sample for its calcium ions content got the followingresults: 0.0077 %, 0.0080 %, 0.0079%, and 0.0082 %. The actual amount of the ions in thesample is 0.0095%. What conclusion can you deduce about the accuracy and precision ofthese results?"Analytical data are never more reliable than the sampling technique". Explain this statement.Richards and Williard determined the molar mass of lithium and collected the following data (a) Find the mean molar mass determined by these workers. (b) Find the median molar mass (c) Assuming that the currently accepted value for the molar mass of lithium is the true value, calculate the absolute error and the present relative error of the mean value determined by Richards and Williard. (f) What factors have led to changes in molar mass since 191? (g) How would you determine the accuracy of a molar mass? Experiment Molar mass, g/mol 1 6.9391 2 6.9407 3 6.9409 4 6.9399 5 6.9407 6 6. 9391 7 6. 9406
- 42.How many of the following should be included in a good hypothesis? (i) A prediction of the results of the experiment (ii) A step-by-step walkthrough of how to do the experiment with specific references to amounts of reactants, glassware used, and other experimental details (iii) A summation of the data collected after doing the experiment, with comments on accuracy and precision if possible. (iv) A detailed list of chemicals that will be used (v) Waste disposal procedures (vi) A brief scientific explanation of the predicted results. Said another way, the hypothesis should include a scientific explanation of why the predicted results are expected. A. 1 B. 2 C. 3 D. 4 E. 5what are the possible errors that could be encountered during the analysis?1. a. Calculate the mass of BaSO4 required to make 50.00 mL of a 0.1500 M solution. b. Calculate the absolute uncertainty in the molar mass of BaSO4. c. Calculate the absolute uncertainty in the concentration, assuming that the balance is calibrated and precise to ±0.1 mg and that the volumetric flask is calibrated and precise to 0.05 mL.