Question

you tested milk (unknown i) with benedict solution. what final color did you see in the test tube? what is the meaning of this result? does it indicate the presence or absence of a certain substance?
tube color: select
select
white
yellow
red
purple
blue
green
black
results: p
meaning:
simple sugars
question 5
2 pts
you tested milk (unknown i) with lugol solution. what final color did you see in the test tube? what is the meaning of this result? does it indicate the presence or absence of a certain substance?
tube color: white
results: negative

Explanation:

For the Benedict's test on milk (unknown I):

Milk contains lactose, a reducing sugar (simple sugar). Benedict's solution tests for reducing sugars. When positive (presence of reducing sugars), the color changes from blue (initial) to green/yellow/orange/red depending on sugar concentration. Milk has moderate lactose, so the color is typically yellow (or greenish - yellow, but among the options, yellow is appropriate). The meaning is that the test is positive for simple sugars (lactose here), indicating the presence of simple sugars.

Lugol's solution (iodine - potassium iodide) tests for starch. Milk does not contain starch. A negative result for starch with Lugol's solution means the color remains white (or the iodine solution's color doesn't change to blue - black, and since milk is white, the final color is white). The result is negative, indicating the absence of starch.

Answer:

Tube Color: Yellow
Results: Positive
Meaning: Indicates presence of Simple Sugars

For the Lugol's test on milk (unknown I):