can someone please help me with the right answer for the following questions. ca

Question

can someone please help me with the right answer for the following questions. can you please answer all of them or dont attempt to answer. thank you.

9. What was the precision of the measurement based on a single standard deviation A. 21 ugmL. B. 0.0116 ugmL 1 C. 0.9956 ugmL D. None of the above (1 mark) 10. Which ONE statement about Thin Layer Chromatography (TLC) is correct? A. The BA value of a substance is an indication of the boiling point of the substance B. A gaseous mobile phase can be used in a TLC separation C. A high & value is indicative of a substance that adsorbs strongly onto the stationary phase. D. A low Re value is indicative of a substance that adsorbs strongly onto the stationary phase. (1 mark) 11 TLC can be used to distinguish between different am o acids. If a particular amino acid has a high solubility in the mobile phase used, then it will show or have which ONE of the following characteristics? A. A low BA value. B. Spend more time dissolved in mobile phase than on stationary phase. C. Move at a speed close to that of the mobile phase D. A high molecular mass. (1 mark) 12 In TLC components migrate at different rates due to differences in which ONE of the following? A. Solubility, B. Adsorption, C. Charge D. All of the above (1 mark) 13. Which ONE of the following reasons explains why chemical derivatisation is normally used for high molecular weight carboxylic acids? A. Chemical derivatisation disrupts the polar hydrogen bonding B. Chemical derivatisation will allow polar bonding to form between hydrogen atoms C. Chemical derivatisation will make it easier to allow the column to heat up D. Chemical derivatisation will allow the splitless injection mode to be used in a separation (1 mark)

Explanation / Answer

Since only 1 question can be answered per post , i would have attempted 9th question , but the information is missing for that.

Let me answer 10 for you

Ans 10 B. A gaseous mobile phase can be used in TLC seperation.

In thin layer chromatography , the seperation of materials is based on the competition if solute and mobile phase for binding on the stationary phase.

The stationary phase is a solid media , and the mobile phase could be liquid or gas.

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