Chem142_Calib_Report_Gradescope_021819_PC

1. Sketch and label the main parts of the mass spectrometer. 2. Give detail description about how it works.

After heating 2.000 g of MgSO4.7H2O to constant mass, the remaining residue in the crucible weighs 0.978  g. Using the data above , calculate the mass of water lost. After heating 2.000 g of MgSO4.7H2O to constant mass, the remaining residue in the crucible weighs 0.978  g. Using the data above , calculate the mass percent of water in the hydrate. 16 AND 17 PLEASE

Referring to the posted calibration curve ...A 2.345 g sample of a ruthenium ore was dissolved and diluted to 100.00 mL. 4.000 mL of this sample was removed, treated appropriately, and diluted to 50.00 mL. This solution has an absorbance of 0.320. Calculate how many grams of ruthenium (MW = 101.07 g/mol) were in the sample.Select one:1.6 1.3 51 52 1.2

The average experimental mass percent of oxygen in potassium chlorate is higher than the theoretical value. This is because some of the potassium chloride product splattered out of the crucible during the heating process.  Explain this statement using an analysis of the image. TV = 39.165% EV = 40.767%

Describe the role played by the electron gun and the electric field in the mass spectrometer.  State Hess's Law & Raoult's Law

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?

Copper on the left and zinc on the right. Write a description of the macroscopic observations you may expect when testing this experimental design.

A3 Briefly, but informatively discuss the importance of sample preparation in a modern day laboratory. Using your understanding of separation science how has sample preparation taken advantage of the theory of separation.

Patterson discovered that lead was getting into the environment by

The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μLμL of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μLμL). The absorbance value of the diluted solution corresponded to a concentration of 7.71×10−6  M M . What was the concentration of the original solution? Express the concentration to three significant figures with the appropriate units.

The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL�L of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μL�L). The absorbance value of the diluted solution corresponded to a concentration of 6.22×10−6  M � . What was the concentration of the original solution?

Referring to the posted calibration curve (image attached) ...A 2.345 g sample of a ruthenium ore was dissolved and diluted to 100.00 mL. 4.000 mL of this sample was removed, treated appropriately, and diluted to 50.00 mL. This solution has an absorbance of 0.320. Calculate how many grams of ruthenium (MW = 101.07 g/mol) were in the sample.Select one:1.6 1.3 51 52 1.2

The 9th element for this tierlist is hydrogen. The simulated experiments only confused me.

#13 for the column, change in composition -- you must choose from the drop down menu "go up, go down, not change"   Thanks!

21. What materials contain a precisely known concentration of a substance typically used in quantitative analysis?   A. ACS grade MaterialsB. Chemical Standard MaterialsC. IUPAC Standard MaterialsD. PIPAC Standard Materials

1. Determine the percentage of hydrogen peroxide in the solution sample.  2. naturally occurring manganese consists of only the Mn55 isotope. determine the moles of the manganese sulphate in the product solution, then calculate the totally number of neutrons present in all the manganese ions in the final solution.

Scenario In an investigation, lab groups combine two compounds, as shown below. Based on the data collected from all lab groups, you realize that one group’s data was not possible.     Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)   External Data   Group Number Mass of Mg (g) Mass of HCl (g) Mass of MgCl2 (g) 1 5  15                                     20 2 5 15 17 3 5 15 21 4 5 15                                     20 5 5 15                                    19   Prompt  Make a claim about which group’s data is not possible. Use evidence and scientific reasoning to support your claim. Include a rebuttal in your answer.   Claim (1 sentence): ______________________________________________________________.   Evidence 1 (2-3 sentences):…

Since ore can contain copper and other minerals, what imaging technique can you use that can determine the elemental composition of elements and how the elements in the ore are being distributed? Explain how this imaging technique works.

Explain if it is possible to combine different types of mass analyzer.

explain in short terms the following vocab: exact mass, elemental analysis, mass spectrometry and their applications

The pencil's "lead" main element is:  a. C b. Sn c. Ld d. Pb I need explanation in a research way. Please don't base the answer to any articles that can be seen in google instead base it with a research paper or any studies with authors. Book-supported is also okay.

use ion exchange method in analytical separation to separate mercury and nickel from polluted water using analytical steps and protocols.

Hi, I found the data in the attached table.  The question I am struggling with is attached as well.  Particuarly, the last sub-question, part C, which is about what happens to the hydrate formula if the copper sample (or crucible) is "wet" rather than "dry."  I think that the hydrate formula would increase from 2 to 3, but could you confirm and explain what steps I would take to know this for sure?  Thank you

Explain the advantages and disadvantages of mass spectrometry?

Please help me fill in the correct blanks

you are designing a rocket engine th uses a mixture of hydrazine and water as a propellant. this engine will be mounted to an unmanned drone bound for hydrazine for the return launch. how much will this hydrazine weigh on the surface on venus express this quanitity in Newtons. the molecular formula of hydrazine is N2H4, you may assume the molecular weights of nitrogen and hydrogen are 14 and 1 g/mol, respectivly. Gravitational acceleration on Venus is 8.87m/s^2.

A student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)

Mm.22. Subject:- Chemistry   Explain...

Chemistry Common Isotopes and Mass spectrum of element Mo are given below Most common isotopes: Mo-98; Mo-96 Mo-95; Mo-92; Mo-97 ; Mo-100; Mo-94   Calculate the average atomic mass of Mo How the MS determined the relative intensity (Scale of 100) and Isotope abundance (%)? Why absolute intensity was not used? Can detector sensitivity, ICPMS temperature influence the relative intensity? Explain

Chemistry How to balance centrifuge with odd number of vials with no balancing vials. Given 24 slots, with 7, 9, 11, 13, 15, 17, 19 vials.

Please don't provide handwriting solution   The spay used to develop the chromatogram is a solution of Group of answer choices a.) Ferrocyanide, ammonia, and iodide b.) Ammonia c.) Potassium permanganate d.) Potassium ferrocyanide