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- 3D16283.34693 16.3 mapbe -> 2. The volume of a cylinder is calculated as V= r?h where nr2 is the area of the circle. If a gallon of kerosene were spilled on a still lake and the height of the slick is, 1.386 nm, what would be the area in m? of the oil slick on the surface of the pond? 1 gal = 3.8 L; 1 nm = 1 x 10-9 m; 0.81 kg = 1 L; 1 kg = 2.206 Ibs; %3D %3D %3D %3D 1000 cm3 = 1.0 liter %3D 1.386nm |1X10-m Inm Aluminum has a density of 2.70 g/cm3. What would the volume be in in3 of a piece of alA sample is selected from a population with µ = 46, and a treatment is administered to the sample. After treatment, the sample mean is M = 48 with a sample variance of s2 = 16. Based on this information, what is the value of Cohen’s d?Q3)a) Discuss the any two applications of Beer’s law with suitable justification. (b) In an analytical laboratory a chemical compound namely Paracetamol (151.163 g/mol) is determined in a sample. A sample weighing 0.0295 g was dissolved in a solvent and diluted the solution to 1 L. The solution has λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.638 in a 2 cm cell. Calculate the percentage paracetamol in the sample. (c) Analyze any two causes of non-linearity of curve in the Beer’s law.
- What is a 99% confidence interval uncertainty of the slope when we are given a trendline with a slope of 42.211 and an R² value of 0.9991 for a set of 145 data points?Use the figure below (Figure F01-7-8) to answer this question. Temperature Anomaly (°C) 106 [OSS [ [(4 10% COD -€62 · [(14) -€0.06 Annual mean 15 year mean 1:00:3 130233 1840) Which statement is a correct interpretation of the data depicted in the plot? The mean global temperature has decreased by ~0.9 °C since 1880. O The mean global temperature has increased by ~0.9 °C since 1880. O The mean global temperature has increased by ~1.1 °C since 1880. The mean global temperature has decreased by ~1.1 °C since 1880. The mean global temperature has increased and decreased since 1880 but overall, the temperature has remained constant.2. As the director of a research laboratory you are paid to decide if there is a significant difference between the mean values of two sets of data obtained by two different scientists, a senior scientist and one recently hired. Use 95% CL. (t at df = 10 is 2.23) Data of Senior Scientist: xmoan = 24.66% with s = 0.06% for n = 5 Data of the New Kid: xmean = 24.55% with s = 0.10% for n = 7
- 9) The following results were obtained in the determination of Vitamin E mass in tablet samples. Sample 1 2 3 4 5 6 Weight of Vitamin E (mg) 249.1 249.9 251.2 250.2 244.8 251.0 i. Determine whether any data should be rejected or not at 90 % confidence level. ii. Calculate the mean and standard deviation of the data set above. ii. Express the mean weight of vitamin C at 99 % confidence interval.Icalate Hi BeHot)+6el2( +2Bels() +oHel(②) using Hess Law Bel310+3H2O→H2B/23(g) +3=-122.5K) B2H6(+6H2O(P)→2HB+6H2(火) →トニ-4734人) Male B₂ HO H2(+244145) Siven +3HP Im BelzStudent Discipline Problems The data for a random sample of 32 months for the number of discipline problems that occurred each month at a large high school are shown. Find the 99% confidence interval for the mean when σ 3. Round your answers to one decimal place. = 13 19 10 11 14 25 16 27 22 29 23 29 28 17 17 22 28 26 29 20 22 18 14 215 16 27 17 14 17 110 11 20 19 22 Send data to Excel We are 99% confident that the mean is between 15.1 and 17.8 discipline problems per month.
- 5. | The biochemistry that takes place inside cells depends on O various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through nar- row pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. Measurements with microelectrodes have shown that a 0.30-nm-diameter potassium ion (K+) channel carries a current of 1.8 pA. a. How many potassium ions pass through if the ion channel opens for 1.0 ms? b. What is the current density in the ion channel?O J. nm 1 O J. m-1 OJ-I.nm Evaluate Correct! 4) Other Linearization Choices 0/2 points When using x =1/A, the meaning of the slope is hc. There is more than one way to make this data linear, though. For example, instead of choosing x 1/A, you could also choose x = c/A. What would the slope mean in this case? Note that in reality, your choices of variables may be limited by the goals of your experiment, the data available, and the model to which you are fitting your data. Evaluate Incorrect: You're looking for an algebraic representation. If this question had asked the meaning of the slope when y = E and a = 1/A, you would have answered hc. 5) Planck's constant 16 point Other than aesthetics, why would it be useful to fit data with a straight line? Real data is noisy. Often with noisy data, the trend will be more accurate than using a single point. c auantired a crucial understanding in the dexelonment of guantum mechanics. The equation isIn the technique of high performance liquid chromatography (HPLC) the peak area response for a particular analyte is directly proportional to concentration Analgesic tablets typically consist of aspirin and caffeine as the active ingredients, the remainder made up of inert binding material. The concentrations of aspirin and caffeine may be routinely monitored using HPLC, whereby the peak areas obtained from a solution of the tablet are compared with those obtained from standard solutions of the analytes. In an analysis to determine the concentration of caffeine in such a tablet, the following data were recorded: Solutions Analysed: Tablet Sample: Mass of tablet (dissolved in 250 cm methano): 0.523 g Caffeine Standard: Mass of caffeine (diessolved in 500 cm methanol) 0.105 g HPLC results: Solution Peak Area (catfeine) 1. Tablet Sample 325 2. Caffeine Std. 865 The concentration of caffeine in the tablet (expressed as a mass (w/wl percentage) was Oa 1.89 Ob 13.4 O 3.77 Od. 267 Oe 7.54 You…