(a) Brownian motion describes the movement of...circle your answer Single molecu

Question

(a) Brownian motion describes the movement of...circle your answer Single molecules or A group of molecules enclosed area within a particular area (b) Diffusion describes the movement of...circle your answer Single molecules or A group of molecules enclosed within a particular area (a) Consider the following molecules: Glucose (C_6H_12O_6) Water (H_2O) stanch Potassium iodide (I_2KI) Write a number "1" above the smallest molecule. Write a number "4" above the largest molecule. Write "2" and "3" accordingly over the remaining two molecules. (b) The picture below represents a piece of dialysis tubing. Note how it contains several pores. Which of the molecules from part a is the most likely to be able to move through the dialysis tubing? Explain your answer. (c) Which of the molecules from part b would be least likely to be able to move through the dialysis tubing? Explain your answer. Suppose that someone gives you an unknown solution, and you wish to find out whether this solution contains glucose. To do this, you perform a Benedict's test. a) Performing this test requires adding something called _____solution to the solution of interest. b) Consider the solution you named in the previous question. After adding this to your solution of interest, what do you have to do next? c) If you perform a Benedict's test on a solution that does contain glucose, then it would produce what color(s)? d) If you perform a Benedict's test on a solution that does not contain glucose, then what would you expect to see?

Explanation / Answer

Ans-3a-A group of molecules enclosed within aparticular area

Ans-3b-A group of molecules enclosed within aparticular area

Ans- 4a

                1 2 3 4

Water (MW-18.0)            Potassium iodide(MW-166.0) Glucose(MW-180.15)     Starch (MW-342.3)

Ans-4b   

All the foor molecules are present inside the dialysis tube which means their is higher concentration of solute inside the tube so water cannot move outside because solvent always move from lower concentration to higher concebtrated solution. Iodine can freely move from semipermeable membrane, glucose is readily permeable and starch cannot move. So iodine is the first mol. which move through the dialysis membrane.

Ans-4c

Starch is least movable molecule through semipermeable membrane because of its larger molecular size. Water will also move as iodine or glucose move outside the dialysis tube which will increase the concentration of solute outside the tube.

Ans-5a

Benedict's solution

5b- Heat the sulution in boiling water bath for 2-3 min.

5c-Blue or purple colour

5d- If colour change is there than other reducing sugars should be there or if no colour change than sucrose should be there (non-reducing sugar0

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