Think about the situation where you are investigating the relationship of study time vs. exam grade. a. Which variable would be on the x-axis (and why)? b. Which variable would be on the y-axis (and why)? c. Would you expect the slope to be positive or negative (and Why)? 2) Contrast and compare interpolation with extrapolation. Which is “safer” to use and why? 3) Look up how “the best fit straight line” is constructed. The term “Least squares” should be in your explanation. 4) If I plot some data and end up with a r2 of (-) 0.99, is my plot useless? Explain.

28-31. Supply the missing value. n 1.55 1.65 1.70 1.80 ??? 1.62 Conc. 10% 15% 25% 35% 22% ??? 28-29.a. 1.66       c. 1.70b. 1.68       d. 1.72 30-31.a. 14.24     c. 16.24b. 15.24     d.17.24

1.give some precautionary measures in the use of microscope 2.List the part of the microscope and give its function 3.definition of patrol 4.history of traffic 5.Early mode of transportation

QUESTION 15 To improve the accuracy of our linear fit between absorbance and concentration, a. add an extra data point to your linear regression where you make the assumption that pure water has an absorbance of zero. b. make sure that you choose a "Linear Regression" curve fit. c. ensure that there are no air bubbles in the cuvette. O d. use the data points only at the lower end of the concentration range because Beer's Law is not applicable for higher concentrations. QUESTION 16 What laboratory equipment do you need to prepare a 0.250 M stock solution of NaCI? O a. buret, graduated cylinder, analytical balance b. beaker, volumetric flask O. volumetric pipet, analytical balance d. analytical balance, volumetric flask

Categorize each as a determinate or an indeterminate error and further classify determinate errors as instrumental, method or personal.d) The tip of the pipet used in the analysis is broken. e) In measuring the same peak heights of a chromatogram, two technician each report different heights.

Which of the following is true regarding calibration curve? O a. Most calibration curves show positive or negative deviations after certain value of concentration. O b. They are plots between response and concentration. O C. A and B are correct. O d. A andB are not correct.

In a particular trial, a student got a value for R of 0.083. Calculate the percent deviation of this result. Enter a number without the % sign. The percent deviation should be reported as a positive value.

3. The TLC technique can be used to: a. Check the purity of a compound. b. Determine the number of components in a mixture. c. Purify large amounts of a compound. d. Check the identity of a compound all of the above b and d a and d a and b a, b and d

You measure a sample in your spectrophotometer that has an absorbance of 1.00. What is the concentration of your sample in M.

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