5 Questions
What is the purpose of wearing safety goggles when carrying out chemical tests for carbohydrates, proteins, and lipids?
To prevent eye injury from the hazardous chemicals used in the tests
Which color change indicates the presence of starch when testing for carbohydrates using iodine solution?
Blue-black
What is the purpose of using Benedict solution when testing for sugars like glucose?
To create a color change that indicates the presence and amount of sugars
What is the purpose of the Biuret test when testing for proteins?
To create a color change that indicates the presence of proteins
What is the purpose of adding ethanol to a food solution when testing for lipids?
To create a white cloudy emulsion that indicates the presence of lipids
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.
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.
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