Serology Portfolio

To run a spectrophotometry experiment, begin by warming up the spectrophotometer and preparing the samples. Be sure to select the correct absorbance (X), then run a measurement on the sample solution. Follow up by running measurements on sample solutions. Once data is collected, turn off the instrument, clean the area, and discard the samples. Partially correct (2 of 4 correct)

Individually weigh each of the nine nickels used in part 2b. Then calculate the average,average deviation, and standard deviation of the nine samples. The mass of a U. S. nickel,when minted, is 5.000 g. What is the percent error between your average and the U. S. Mintvalue? Pay close attention to your significant figures when doing these calculations.   Sample Mass (g)                                                         Average Mass ____________ gNo.1 _5.029 ______                         Average Deviation ____________ g2 _5.010 ______                          Standard Deviation ____________ g3 _4.983 ______                            Percent Error ____________ %4 _5.036 ______5 _4.989 ______6 _5.026 ______7 _5.028 ______8 _4.980 ______9 _4.952 ______   im having issues with average deviation and standard deviation

Normality of a solution was determined by five different titrations. The results were 9.5 mL, 8.5 mL, 9.1 mL, 9.3 mL, and 9.1 mL. Calculate the mean, median and standard deviation of this data

Which of the statements below are TRUE regarding the mean and standard deviation? I.    As the number of measurements increases, x̄ approaches μ if there is no random error.II.    The square of the standard deviation is the average deviation.III.    The mean is the center of the Gaussian distribution.IV.    The standard deviation measures the width of the Gaussian distribution.

■ True or False: in a TOF analyzer, a fragment of low mass reaches the detector first ▪ In GCMS when we know what analytes we are measuring we use not know what analytes are in the sample we use than scan. ▪ A) Scan; SIM ■ B)SIM; scan • C) SIM; SIM mode. When we do mode. SIM allows greater sensitivity

The Covid-19 pandemic has many experts commenting on the science associated with the virus - origins, vaccines, monoclonal antibodies, masks, social distancing.  It is important to consider what the experts say, but to also evaluate their statements.  We will start with the scientific method.  I want you to outline the scientific method from what you have been taught in previous classes.  You can list steps, parts, process, short descriptions, whatever.  If not taught in previous classes, then you will make your best guess about it.

Olympic athletes are tested to see whether or not they are using illegal performance-enhancing drugs. Suppose that urine samples are taken and analyzed, and the rate of false positive results is 1%. Suppose also that it is too expensive to refine the method to reduce the rate of false positive results.We certainly do not want to accuse innocent people of using illegal drugs. What can you do to reduce the rate of false accusations even though the test always has a false positive rate of 1%?

How does analytical chemistry help in forensic science?

What are the differences between systematic and random errors and how do they effect accuracy and precision?   In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample?   A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus   The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation:   y = 44.72x + 4.06   what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?

• Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·

Suppose a normally distributed set of data with 8900 observations has a mean of 123 and a standard deviation of 16. Use the 68-95-99.7 Rule to determine the number of observations in the data set expected to be above a value of 107. Round your answer to the nearest whole value. Hint: This problem is asking for how many observations not the percent. Answer Tip: Don't round any probabilities or percentages in your calculations. Keep all decimal places and round at the END of the problem.

* The data in the table below were obtained during a photometric determination of glucose in blood serum. A serum sample gave a transmittance of 0.45. Find the glucose concentration in the blood serum. * Glucose 0.0 2.0 4.0 6.0 8.0 10.0 concentration, mM Absorbance 0.002 0.15 0.294 0.434 0.5704 0.704

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

0 / 5,000                         What is your question?   photo 0 / 2 Images Ask an Expert Submit your question Answers in as fast as 30 minutes* Questions are typically answered in as fast as 30 minutes* Like you, we deeply value honesty and integrity. Learn about our honor code. *Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. Get 24/7Homework Help! Ask a homework question in 30 subjects...and growing! Subject matter experts are on standby 24/7. Get a detailed solution in as fast as 30 minutes.* Recently asked questions     About FAQ Honor Code Code of Conduct Sitemap Careers Become an Ambassador Refer a Friend Contact Bartleby Contact Research (Essays) High School Textbooks Literature Guides Concept Explainers by Subject Essay Help

MRI machines primarily work using ____.a. The nuclei of carbons in fatty acid chainsb. The nuclei of oxygen atoms from water molecules in the bodyc. The nuclei of hydrogen atoms from water molecules in the bodyd. The nuclei of radioactive isotopes injected into the body

Consider the following data set: Sample 1 2 3 4 5 Diluted Unknown (25% dilution) Diluted Unknown (50% dilution) Undiluted Unknown Absorbance at 470 nm 0.032 0.058 0.090 0.114 0.140 0.072 0.138 0.210 Concentration 1.00 x 10-³ M 2.00 x 10-³ M 3.00 x 10-³ M 4.00 x 10-³ M 5.00 x 10-³ M 1. Using MS Excel, plot a calibration curve for samples 1 to 5 (Attach a printed copy of the graph). Determine the molar absorptivity. 2. Calculate the concentration of the diluted and undiluted unknown using the linear regression equation produced from #1. 3. Back-calculate the concentration of the undiluted unknown using the calculated concentration of the 25% and 50% diluted unknown from #2. 4. Explain any significant difference that you see between the concentration of the undiluted unknown that is back-calculated from the absorbance of the 25% and 50% diluted unknown, and the concentration that is directly calculated from the absorbance of the undiluted unknown. 77

2 W S Type your answer to the following: Consider the steps the student took in the following scenario. Then describe anything the student did wrong and how it would have affected the student results (too high, low, or unchanged) and why. X A student forgot to weigh the filter paper prior to filtering the salt from the sand. To make up for this, the student weighed a different filter paper from the box and used that mass in the calculations. Edit View Insert Format Tools Table 12pt Paragraph # 3 80 F3 E D $ 4 C 888 R LL F BI U % 5 V F5 T G MacBook Air 6 F6 Y B T² & 7 H F7 A U N * 00 8 J 1 ( 9 M K O F10 L X P

Explain your rationale for using the summative assessment (below) from the lesson plan on mixing substances in a 5th-grade classroom based on the below standard and learning objective, including how it aligns with the learning objective.  Summative Assessment  Summative: Components of the Lab Report Purpose: The student should clearly state the purpose of the experiment, which is to determine whether the mixing of two or more substances results in new substances. Procedure: The student should describe the steps they took to conduct the experiment. This includes the substances they chose to mix and the safety equipment they used. Observations: The student should record any observable changes that occurred when the substances were mixed. This could include a color change, the formation of a precipitate, or a change in temperature. Conclusion: The student should state whether a new substance was formed based on their observations. They should also reflect on their accuracy in…

Provided are spectra for a compound with molecular formula CgH100 Part A) Give the degrees of unsaturation Part B) Identify the peaks that are associated with specific bonds of the structure and list the corresponding functional groups that the specific bonds belong to. Re- create the example table below that organizes this information. Use the wavenumbers that are already labeled on the spectra. Example table: wavenumber (cm-1) Corresponding Bond Type Corresponding Functional Group C(sp3)-H N-H 2978 3300 Part C) Draw the structure and clearly indicate which hydrogens correspond to which signals in the HNMR spectrum ONLY. The signals are already labeled A-D on the HNMR spectrum. Match the hydrogen labeling (HA, HB, etc.) on your drawn structure to the signal labeling provided. 4300 3320-2872 2951 3006 3003 2001 alkyl amine 1613 1510 1000

Can someone answer nos. 5 to 10? Thank you very much! If it's not too much, provide an explanation for each number. Thanks!

Explain the use of plans and their importance in assessing the quality of pharmaceutical products. Provide a step-by-step design of a sampling plan based on a normal inspection for a 75,000 tablets with an AQL of 0.12% using the attached table (at the end of exam paper).

Methods of Analysis Test #1: Polarity, or Effect of a charged rod on a stream of liquid: This test was used to determine the relative polarity of the unknown liquid. The liquid was allowed to run out of a buret and a charged rod was brought up next to the stream. The observations were reported as to whether or not the stream of liquid responded to the charged rod and to what degree. Try this at home with water and a plastic spoon. Rub the plastic spoon against a sweater and move it close to a small stream of water running out of your faucet! Test #2: Volatility, or Rate of Evaporation: A thermometer probe was wrapped with a strip of filter paper. This assembly was soaked in one of the liquids for one minute. The probe was removed, and the temperature change was monitored as the liquid evaporated. The results are given in Graph 1 below. (See Graph)   Graph 1: The curves generated of the change in temperature over time for the substances acetone, hydrogen monoxide, ethylene glycol,…

a. What instrument was used to discover the structure of DNA? b. What shape was expected from the instruments output? VWhy? c. Who were the four main scientists involved in discovering the structure of DNA? d. What did you notice about the process of science represented in the video? Name at least three things that you noticed. Edit View Insert Format Tools Table 12pt v Paragraph v BI Address DELL F4 F5 F6 F7 F8 F9 F10 F11 II 88888: $ & 4. 6. 7

Which analytical separation method is best for recovering river bodies that are polluted by heavy metals and particulate matter. Explain your analytical process of choice.

2. What measurements might you record regarding water samples to assist with the quantification process? How might these measurements have error introduced? 3. Create a table of your observations made during the experiment. For example: Sample 2 Sample 1 Initial After shaking Write a brief summary of any conclusion that were reached. 4. With your group, write a sentence statement of the objective of the experiment and the method that will be used.

8) Two different analytical methods are compared for determining Ca. The following are two sets of data. Set 1 Set 2 155.779 155.784 155.787 155.787 155.813 155.765 155.781 155.793 i. i. Determine the mean and the standard deviation in Set 1. Calculate the 95% confidence limit for data in Set 1. Identify a possible outlier in Set 2. Use the Q-test to determine whether it can be retained or rejected at 95% confidence level. ii.

The spectroscopic data in the table is generated with five solutions of known concentration. Concentration (M) 0.0133 m= 0.0266 0.0532 0.106 0.213 Absorbance 0.1271 What is the intercept of the linear regression line? 0.08531 0.5388 1.069 Use a spreadsheet program, such as Microsoft Excel, to graph the data points and determine the equation of the best-fit line. 1.954 What is the slope of the linear regression line formed by these points? M-1

Please confirm if my answer is correct or not. Due to the need for this to be correct I would like you to provide me with a confidence score in you answer on a scale from 1 to 10 how confident are you in your answer. Please be sure to double check your answer

Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment.    Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.

Simplify. Write each answer in scie 17) (5.4x 10")는 (7X/0") 19) (6 x 10°(4 x 10-1) 21) (7.68 x 10:)는 (9x/0°)