Question

You need to analyze two samples: a) from gas station tank (gas quality test) b)crop extract...

You need to analyze two samples: a) from gas station tank (gas quality test) b)crop extract for pesticide presence. Which separation method will you choose and why?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

(a) Gas chromatography is commonly used as a separation method for analyzing gas samples because this method has high resolution power. It is more accurate and has more precision.

(b) To analyze crop extract for pesticide presence the separation methods such as pressurized liquid extraction (PLE) and supercritical fluid extraction (SFE) using aqueous solvent are applied. Aqueous extraction is preferred because alomost all pesticides are soluble in water. Water as a solvent is easily available, safe to use and also less costly.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
To compare water quality from wells in two different areas, water samples were taken from 50...
To compare water quality from wells in two different areas, water samples were taken from 50 wells in the first area, tested, and 31 were found to meet standards. From the second area, 42 out of 60 wells were found to meet standards. Use the p-value method to test the claim that both areas have the same proportion of wells that meet standards at the 95% confidence level. Based on this result, does there appear to be a significant difference...
Based on a survey we collected 2 samples of SAT scores from A city and B...
Based on a survey we collected 2 samples of SAT scores from A city and B city. Based on this: A city: 418,421,421,422,425,427,431,434,437,439,446,447,448,453,454,463,465 B city: 429,430,430,431,36,437,440,441,445,446,447 Write down the null hypothesis if the goal is to test if the average score in A is not different from B? What is the alternate hypothesis? Do a statistical test to reject or not reject your null hypothesis. What test did you choose? Based on the test can reject or not reject your...
The following hypotheses are given and reflect something you want to test about two samples: You...
The following hypotheses are given and reflect something you want to test about two samples: You sample randomly from the first population a total of 18 observations and observe a standard deviation of 45. Then you sample from the second population 13 observations and calculate a standard deviation of 71. Testing at the 0.05 level of significance, make a decision about your hypotheses regarding these samples. (A) Thecriticalvalueis:______________(8) (B) The test-statistic is: ________________ (10) (C) Circle the correct response: (8)...
You need to test the following hypothesis using which statistical test? Girls who participate in an...
You need to test the following hypothesis using which statistical test? Girls who participate in an after-school character building program for 6 weeks have improved self-image (total self-image score 0 to 100) from the beginning of the program (time 1) to the end of the program (time 2). Select one: a. Paired-samples t-test b. Chi-square c. T-test d. Correlation
1. The following hypotheses are given and reflect something you want to test about two samples:...
1. The following hypotheses are given and reflect something you want to test about two samples: You sample randomly from the first population a total of 18 observations and observe a standard deviation of 45. Then you sample from the second population 13 observations and calculate a standard deviation of 71. Testing at the 0.05 level of significance, make a decision about your hypotheses regarding these samples. (A) The critical value is:______________(8) (B) The test-statistic is: ________________ (10) (C) Circle...
If a researcher is conducting a two independent samples t test, what information is needed from...
If a researcher is conducting a two independent samples t test, what information is needed from the population to calculate the t statistic? a. You must know the population mean b. You must know the population variance or standard deviation c. You must know the population mean and the variance or standard deviation d. The t statistic does not require any information about the population
Suppose that the samples of polythene bags from two manufacturers A and B are treated by...
Suppose that the samples of polythene bags from two manufacturers A and B are treated by a prospective buyer for bursting pressure with the following results; Bursting pressure (Ibs) number of bags        A                   B 5.0 - 9.9 2 9 10.0 - 14.9 9 11 15.0 - 19.9 29 18 20.0 -24.9 54 32 25.0 - 29.9 11 27 30.0 -34.9 5 13          110 110 Required Which set of bags has the highest average bursting pressure? Which has more...
You can get your electricity from two different sources: Solar (S) or Natural Gas (G). You...
You can get your electricity from two different sources: Solar (S) or Natural Gas (G). You see solar and natural gas as perfect substitutes, and are indifferent between the two sources. Right now, electricity from natural gas is $0.10 per unit and solar is $0.25 per hour. You have $50 per month to spend on electricity. 1 Intuitively, given your preferences and prices, which source would you use? 2 Based on your preferences, what is your utility function? 3 Graph...
1. You have two identical containers, one containing gas A and the other containing gas B....
1. You have two identical containers, one containing gas A and the other containing gas B. Both gases are under the same pressure and are at 5.0 ?C. The molecular masses are mA = 3.29 × 10?27 kg and mB = 6.12 × 10?26 kg. (a) (1 point) Which gas has greater translational kinetic energy per molecule? (b) (1 point) Which gas has greater rms speed? (c) (1 point) Assuming you can only change one of the containers, the temperature...
Political bias in academia and a paired-samples t test: The following is an excerpt from the...
Political bias in academia and a paired-samples t test: The following is an excerpt from the abstract (brief opening summary) from a published research study that examined a reported bias against conservatives in American academia (Fosse, Gross, & Ma, 2011). The American professoriate contains a disproportionate number of people with liberal political views. Is this because of political bias or discrimination?…We sent two emails to directors of graduate study in the leading American departments of sociology, political science, economics, history,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT