Answered: Please help answer question 8 and 9

Science

Chemistry

Please help answer question 8 and 9

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Please show steps and answer accordingly. Thanks!
If a solution has an absorbance of 2 you can be certain that the solution is highly diluted and needs to be concentrated all the statements are correct this is a reliable absorbance and downstream analysis can be done the solution is highly concentrated and needs dilution
If the pH of a solution is 2.78 with an absolute uncertainty of ±0.05, what is the [H+] and its uncertainty? O [H+] = 1.66 x 10-3 M uncertainty in the concentration O [H+] = 1.66 x 10-3 M uncertainty in the concentration O [H+] = 1.34 x 10-4 M uncertainty in the concentration 1.78 x 10-5 M O [H+] 1.33 x 10 M -4 uncertainty in the concentration= 1.91 x 10-4 M -1.25 x 10-5 M 1.65 x 10-5 M
A. What is the term for the wavelength where a solution will absorb the most light? B. What is the term for the distance through which the light travels before it reaches a detector?
3. A solution has an hydroxide concentration, [OH], of 1.02 x 10 M. Calculate it's pH and decide whether it would make the bulb glow low, medium, or high based on your data table. Explain your reasoning. Show all work to receive up to full credit.
Please do questions 2 and 3. Dont do it all, just show me how to solve one and I will do the rest.
You were tasked to separate the components of a mixture containing silica, sodium chloride and charcoal. TNāCI dissolves in water while silica and charcoal are not water-soluble. Only charcoal dissolves in carbon disulfide. a. Write a short experimental procedure to carry out the separation of the mixture. b. Given the following data, determine the percentage of charcoal, sodium chloride and silica. Mass (g) Mass of beaker 100.000 Mass of beaker + mixture 110.000 mass of evaporating dish 62.000 mass of evaporating dish + solid after evaporation of water 65.000 Mass of beaker + charcoal + silica after evaporation of excess water 117.000 mass of beaker + silica after decanting dissolved charcoal and drying 113.545
You send off a soil sample what is the soil CEC and Base Saturation Element PPM MW Al +3 Ca Y2 Mg x2 360 27 240 40 220 24 180 39 Na 170 23 15 1
After performing Part A of the experiment, a student obtained the following concentrations for sodium hydroxide. Calculate the average concentration. Report your answer with four places after the decimal. Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 0.977 1.015 0.915 0.943 1.037 0.969
Write your complete solutions on yellow paper, round your answers to the appropriate number of significant figures, and box the final answer. The deadline for submission is at the end of the class. Note: You do not need to write your solutions for the items that can be derived from your calculators. 1. Three students (Saerom, Hayoung, and Jiwon) are asked to determine the ppm Ca in a drinking water sample by titration with EDTA. Each student performed five trials for the sample. The results in ppm Ca are the following: Saerom Hayoung Jiwon a. Get the mean, SD, and % RSD of each student's results. b. If the true value is 35 ppm, calculate the relative error of each student's results. c. Comment on the precision and accuracy of each student's results. The maximum % RSD and the relative error set by the lab is 5.0%. d. Use the following table to summarize your answers. Mean SD %RSD Relative Error Comment 31, 32, 33, 33, 32 35, 34, 34, 35, 34 35, 38, 33, 35, 37 Saerom Mean SD 95% CI…
Question 4. In the course material you have been introduced to multiple charging for electrospray spectra. Each peak in the spectrum below can be used to provide a measure of the mass of this protein, you can work out the charge associated with each peak, and measures can be averaged to find the overall mass. Use simultaneous equations to find the charge associated with each peak in the spectra below, which will allow you to calculate the average mass of each species. Include an estimate of the error associated with this measure. 659.8 714.7 779.5 857,4 952.6 1071.5 BMW Sp
1. A company illegally dumped their wastewater on a river bank. You are part of an environmental NGO that are tasked to determine what kind toxins that may have contaminated the waters. What kind of analysis would you do? a. Characterization analysis b. Qualitative analysis c. Fundamental analysis d. Quantitative analysis 2. Four groups weighed ten rock samples each, and tested the possibility of outliers using Q-test. At 95.0% confidence (a = 0.05), which of the following is considered to be an outlier? a. 0.024 b. 0.413 c. 0.453 d. 0.674 3. An unknown solution containing oxalic acid, which is a diprotic acid, is titrated against sodium hydroxide. How many mole/s of titrant is needed to react with one mole of analyte? a. ½ b. ¼ c. 2 d. 4