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Chemical Tests for Carbohydrates, Proteins, and Lipids in Science Labs

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Chemical Tests for Carbohydrates, Proteins, and Lipids in Science Labs

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Questions and Answers

What is the purpose of wearing safety goggles when carrying out chemical tests for carbohydrates, proteins, and lipids?

To comply with school safety regulations, regardless of the chemicals used

To avoid getting chemical solutions on the face during the experiments

To look more professional in the lab environment

To prevent eye injury from the hazardous chemicals used in the tests (correct)

Which color change indicates the presence of starch when testing for carbohydrates using iodine solution?

Green

Yellow

Red

Blue-black (correct)

What is the purpose of using Benedict solution when testing for sugars like glucose?

To create a color change that indicates the presence of proteins

To create a color change that indicates the presence of lipids

To create a color change that indicates the presence and amount of sugars (correct)

To create a color change that indicates the presence of starch

What is the purpose of the Biuret test when testing for proteins?

<p>To create a color change that indicates the presence of proteins</p> Signup and view all the answers

What is the purpose of adding ethanol to a food solution when testing for lipids?

<p>To create a white cloudy emulsion that indicates the presence of lipids</p> Signup and view all the answers

Study Notes

Chemical tests for carbohydrates, proteins, and lipids are part of a required practical in science labs.
Safety goggles must be worn when carrying out these tests due to the hazardous nature of the chemicals involved.
Carbohydrates can be tested for starch using iodine solution, where a color change to blue-black indicates the presence of starch.
Testing for sugars like glucose involves using Benedict solution, with colors like green, yellow, and brick red indicating different sugar amounts.
Proteins can be tested using Biuret solution, where a color change from blue to purple or lilac indicates the presence of proteins.
Lipids can be tested by creating a white cloudy emulsion when adding ethanol to the food solution, without the need for filtration.

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Description

Learn about the required practical in science labs involving tests for carbohydrates (starch and sugars), proteins, and lipids with specific chemical reagents. Understand the safety precautions, color changes indicating the presence of different macromolecules, and the procedures for conducting these tests.