7. (2 Points) What is the ability for a liquid to flow in a narrow channel or na

Question

7. (2 Points) What is the ability for a liquid to flow in a narrow channel or narrow tube often against gravity, without the assistance of external forces. A) Viscosity B) capillary action C) deliquescence D) spectroscopy E) Tyndall effect 8. (2 points) Snape grows tired of these conceptual questions and thinks it's time for a problem. What is the retention factor if the distance traveled by the solvent front is 2.00 cm, and the distance traveled by the ion is 0.40 cm? 9. (2 points) Harry wants to know if there are any applications of chromatography. Gel elec trophoresis is such an example. Gel electrophoresis is an example of which type of chromatography? A) Column chromatography B) G chromatography as C) Paper chromatography D) Thin-layer chromatography 10. (2 points) Safety Review: Can you have food or drink in the lab A) Yes, you can have food and drink in the lab. (this is not the correct answer, don't choose it) B) No, you can never bring food or drink into the lab. Furthermore, all food waste, included empty water bottles must be disposed of before entering the lab. If the ministry of heath stops by they will look in the trash cans, searching for water bottles. If they find any, Prof. Vitarelli will be sent to Azkaban. He will be replaced by Professor Umbridge. 11. (2 points) Review of Significant Figures: How many significant figures does the result of the following calculation have: 24.78*(37.3-31.72)? A) One significant figure B) Two significant figures C) Three significant figures D) Four significant figures 12. (22 points) Lastly, Snape thinks we should try one more calculation. What is the retention factor if the distance traveled by the solvent front is 2.0 cm, and the distance the ion is from the solvent front is 0.20 cm? Hint: Be careful with how Snape worded this question.

Explanation / Answer

7) It is a Capillary action (Option: B)

8) Rf = 0.4 cm / 2.0 cm = 0.2

9) Thin layer chromatography (Option D)

10) Option B)

11) It will have three significant figures.

12) It is given ion is there away by 0.20 cm, it means that 2.0 - 0.20 cm = 1.80 cm is the distance of the spot.

Hence, 1.80 cm/2.0 cm = 0.9 is the Rf value.

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