Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Which is correct?
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Random errors affect accuracy and systematic errors affect precision. |
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An accurate result shows agreement with the true or accepted value. |
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Precise results can contain significant random error, but little systematic error. |
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The standard deviation is a good measure of accuracy. |
Polydimethylsiloxane (PDMS) stationary phases have low polarities. Which of the following statements is TRUE about gas chromatography using PDMS stationary phases?
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The gas chromatography column is typically packed with silica microparticles. |
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An oven is used to control the column temperature because a constant temperature is always needed in gas chromatography |
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Octane (C8H18, boiling point: 126 ºC) is eluted later than dodecane (C12H26, boiling point: 216 ºC) |
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3-Pentanone ((C2H5)2CO, boiling point: 102 ºC) is eluted later than propanol (CH3CH2CH2OH, boiling point: 97 ºC) |
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- Preparing a Thin Layer Chromatography experiment there are some common mistakes. Explain what happens in this situation: Sample spots too bigarrow_forwardCorrects the ones that are marked wrong(6a, 6e, and 7) completely and SHOW ALL CALCULATIONS:arrow_forwardChromatography is a separation technique. What is the physical or chemical basis for separation of compounds during thin layer chromatography?arrow_forward
- 1a) Hexane, CH3(CH2)4CH3, is found to have a long retention time when separated from a mixture. A column with a C18 (18-carbon chain) stationary phase and a methanol-water modal phase is used for the separation. Explain why hexane has a long retention time. 1b)You wish to chromatographically seperate a mixtureof the follwing compunds. Which of the two compounds will be most difficult to seperatate from one another? Why?arrow_forwardYou have obtained a gas chromatogram of a two component mixture of compounds A and B. The height of peak A is 3.84 cm. and the width at half height is 1 cm. The height of peak B is 3.49 cm. and the width at half height is 1.36 cm. The percentage of a component in the mixture is proportional to peak area. Estimate peak areas by multiplying height by width at half height. What was the percentage of compound B in the mixture? (Enter your answer as a number without any percent symbol or the word percent.)arrow_forwardFor what type of separation would you use ion exchange chromatography (IC)?arrow_forward
- The following data was obtained for an experiment on the gas chromatographic determination of toluene in an unknown sample using the internal standard method. Concentration (mass %) Toluene Peak Area Ethylbenzene Peak Area 0.50 0.539 1.970 1.00 1.150 2.051 2.00 2.174 2.018 3.00 3.308 2.009 unknown 1.382 2.015 a) Plot the calibration curve for this analysis and calculate the slope, y-intercept, and Pearson correlation coefficient. b) Find the % of toluene in the unknown.arrow_forwardThe following statements are true for any chromatographic analysis except: The analyte component interacting most strongly with the stationary phase elute faster than those with weaker interactions. On the other hand, those with least interaction with the mobile phase elute the slowest. Interactions between mobile phase-analyte - stationary phase can be both chemical and physical in nature. Chromatography is a separation technique. Electromagnetic radiation source for XPS. Gamma ray X-ray UV-Visible Infra red Radiowave The part of SEM that is responsible for the production of electrons. * Electron guns Condenser lens Secondary detector Electron beamarrow_forwardQUESTION 5 In a chromatographic separation using a polar stationary phase and a mobile phase composed of 60% hexane and 40% ethyl acetate, two compounds, benzene (peak A) and toluene (peak B), are eluted. The width of peak A at its base is 1.2 min, the width of peak B at its base is 1.3 min, and the retention time of peak A is 5.2 min and peak B is 3.5 min. What is the resolution (Rs) between these two peaks and is it acceptable? R = 1.36. It is not an acceptable resolution. R = 0.74. It is an acceptable resolution. R = 1.36. It is an acceptable resolution. R = 0.74. It is not an acceptable resolution.arrow_forward
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