GMontenaro M2 Lab 1 - Measurement and Uncertainty

For a certain analysis, the concentration of the analyte was determined using the model equation: Sample - Sblank CA= k where CA is the analyte concentration, Seample is the signal given by the sample, Sblank is the signal given by the blank (sample with no analyte) and k is a proportionality constant. Which of the following formulas best describes the calculation for the combined uncertainty in CA? 2 usplank + ussample + (1) Splank CA Ssample CA = (2) 4sample) + (usmlank)´+ (ux)² CA 2 (uSsampte) +(uShlanz) + (+)° (3) CA Ssample-Spiank 2 uk (4) + (Usplane) + Ussample %3D blank CA

1. A graduated cylinder with a least count of ± 0.5 ml is used in a density experiment. The initial water level, before inserting the irregular shaped solid, is 30.0 ml. After inserting the solid, the water level is 34.5 ml. What is the probable error in the volume of the solid? What is the probable percent error in the volume of the solid?

I still keep getting this question wrong. I put 4.2 E -2 as my answer, and it says I'm correct. So then, I tried 4.16 E -2, then 4.1 E-2, but it still didn't work. I am incredibly lost in this assignment. What am I doing wrong?

Use the formulas below and the data in the table to fill in the empty spaces in the table. (Apply the uncertainty Rule) To Calculate the area for each piece of foil. Area = L (cm) x W (cm).   2. To Calculate the volume for each piece of foil. Volume = Mass/Density.   3. To Calculate the thickness (t)of each piece of foil. Thickness (t) = Volume/Area.   foil Length (cm) Width (cm) Area (cm2 ) Mass (g) Density (g/cm3 ) Volume (cm3 ) Thickness(t) (cm) #1 4.0 3.2     0.80 2.69     #2 4.2 2.8     0.75 2.72

A solid object has a true mass of 91.4132 pounds. A student measured the mass of the object in a lab, and their measured value is too high, with a percent error of 15.61%. What was the measured mass of the object? Must show work for full credit. Put your final calculated answer in a readable background color.

2.A student is trying to determine the volume of a flask and compare it to the known volume. After performing the measurements 10 times, the student calculates an RSD of 2 ppt, with a percent error of 24%. Which of the following statements about the results are correct?   A. The line fits the points on the calibration curve well.   B. The results are precise and accurate.   C. The results are accurate, but not precise.   D. The results are precise, but not accurate.   E The results are neither accurate nor precise.

For each of the following equilibria, write the equilibrium constant expression for Ke Y Part A 2N₂Os (9) 4NO₂(g) + O₂(g) O Ke = O K₂= O K. OK- Submit Part B [NO₂[0₂] N₂O₁ Ke = [NO₂¹0₂] N₂0₂ N₂O₁] NO₂0₁ N₂O, NO₂] O₂ Request Answer 3F2(g) + Cl₂ (9) 2CIFs (9) (CIF₂ CI, P ICE, P Pearson

Record the information about the lines you have generated.  Calculate the number of moles:     (n = intercept / RT) for each set of data.

Hawaii Carbon Dioxide Time-Series 425 CO2 Time Series in the North Pacific 8.30 Mauna Loa Atmospheric CO2 (ppm) ALOHA seawater PCO2 insitu (uatm) ALOHA seawater pH (insitu) 400- 160°W 158°W 156°W 8.25 23°N Station ALOHA 22 375- - 8.20 21° 20° Station Mauna Loa 8 350- 190 -8.15 325 8.10 300- 8.05 275- 8.00 2021 1958 1967 1976 1985 1994 Year" Data Mauna Loa (php.ondi noan ovproductsrendaeeee n mlo iN) ALOHA phahana soest hawaieduttdogstexionhl) ALOHA pi &C0, e calulated a insitu tempere fhom DIC A TA (measured from samples collected on Hawai Ocean Times-series IOT) enuisen) ing coys (Pelletier, v2so) wih constants Lueker et al. 2000, KSO Dickson, Total boron Lee et al. 2010, & KF secarb 2003 2012 What problem in the oceans does the data collected from 1985 to 2021 show?

49) Calculate the length of a copper wire having a diameter of 0.200 cm and a mass of 15.620 g. The density of copper is 8.92 g/cm3. (Given: volume = 7 d2 L/4, where p = 3.14, d = diameter, and L = length) A) 1.80 x 10-4 cm B) 4.00 x 10-4 cm C) 1.75 cm %3D %3D %3D D) 5.50 × 10-2 cm E) 55.8 cm

A researcher would like to determine whether there is any relationship between students’ grades and where they choose to sit in the classroom. Specifically, the researcher suspects that the better students choose to sit in the front of the room. To test this hypothesis, the researcher asks her colleagues to help identify a sample of n = 100 students who all sit in the front row in at least one class. At the end of the semester, the grades are obtained for these students and the average grade point average is M = 3.25. For the same semester, the average grade point average for the entire college is μ = 2.95 with σ = 1.10. Use a two-tailed test with α = .01 to determine whether students who sit in the front of the classroom have significantly different grade point averages than other students.NOTICE that you are asked to use α = .01! A) sig., p<.01 B) N.S. ("not significant"), p>.01 C) sig., p>.01 D) N.S., p<.01

There are 48 pairs of students in the following table. Each pair has quantitatively determined the mass of caffeine in a 355 mL can of the popular energy drink marketed as “GRIME” using Liquid Chromatography-Mass Spectrometry (LC-MS). The class results are presented below. Summarise and report these results including an indication of measurement uncertainty. * Mass of Caffeine (mg) Mass of Caffeine (mg) (Table continued) 208.28 207.54 207.12 206.70 208.54 208.00 208.23 208.49 207.99 206.85 208.74 207.73 206.93 207.27 206.77 208.88 207.55 206.97 208.42 208.65 208.68 208.81 207.59 208.41 207.89 208.42 208.11 206.75 206.49 208.13 207.97 206.79 200.79 208.08 207.69 207.79 207.92 207.85 206.57 208.12 206.89 208.38 207.27 208.15 207.89 206.62 207.71 207.83

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.

1. A student wanted to find the density of an object of unknown composition with a volume of 5.50 0.05 cm³. The mass of the object was 19.255 0.005 g. What is the density of the object, including the absolute uncertainty? a. 3.500 ± 0.3 g cm³ b. 3.500 ± 0.03 g cm? c. 4.259 ± 0,6 g cm¹ d. 4,259 ± 0,06 g cm³

The points on the bullseye are measurements whose exact value is the center of the bullseye. Indicate the correct statement: (A). The points of target 3 have clearly less standard deviation than that of target 2. (B). Target 2 points have the worst repeatability of all. (C). The points of target 3 are a set of measurements that lead to a fairly accurate value of the variable, but the instrument cannot be considered very precise. (D). Target 4 points only have systematic errors.

Dashboard My Home OWLV2 | Online teaching and learning resource from Cengag [References) A student gently drops an object weighing 15.7 g into an open vessel that is full of ethanol, so that a volume of ethanol spills out equal to the volume of the object. The experimenter now finds that the vessel and its contents weigh 10.6 g more than the vessel full of ethanol only. The density of ethanol is 0.789 g/cm°. What is the density of the object? Density = g/cm³ Submit Answer Try Another Version 10 item attempts remaining

Chemistry Describe the difference between accuracy and precision. How do we determine accuracy and precision?       What type of graph would be best for representing the following types of data? The magnitude of two or more discrete, or separate, categories of a variable.         A measurable characteristic of a sample which depends on the concentration of the sample.         How would you indicate variability or dispersion in a data set on a graph

Perform the calculations and determine the absolute and percent relative uncertainty. Express each answer with the correct number of significant figures. To avoid rounding errors, do not round your answers until the very end of your calculations. 7.8 (+0.3) – 2.03 (±0.02) = absolute uncertainty: percent relative uncertainty: 8.24 (+0.04) × 0.012 (±0.001) = absolute uncertainty: percent relative uncertainty: %