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(a) In testing for a certain food substance in a sample, the following steps are required:

I. Pour a little of the sample into a test tube.
II. Pour a little Benedict's solution into the test tube.
III. Heat the test tube until its contents boil.
IV. Brick-red precipitation appears.

(i) Which food substance could be tested for using the above steps?
(ii) Which alternative reagent could be used in place of Benedict's solution?

(b) A student placed a few drops of iodine solution on a piece of bread.

(i) What observation is he likely to make?
(ii) What conclusion could be drawn from the observation?

Sagot :

GinnyAnswer

Final answer:

Glucose and starch can be detected using specific solutions in the provided steps.


Explanation:

Glucose could be tested for using the steps provided. Benedict's solution is used, which changes color to brick-red when a reducing sugar like glucose is present.

Another reagent that could be used in place of Benedict's solution is Fehling's solution.

Observation: The student is likely to observe a color change to blue-black when iodine solution is added to the bread.

Conclusion: The blue-black color indicates the presence of starch in the bread.


Learn more about Lab testing for nutrients here:

https://brainly.com/question/37735395


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