Praktikum Kimia|| Makromolekul uji[karbohidrat, protein,dan lemak]

Summary

This chemistry practical focuses on testing for carbohydrates, proteins, and fats. The carbohydrate test involves using iodine to identify substances like potatoes, rice, and flour that change color upon exposure. The protein test uses lime juice, where substances like soy sauce and milk form clumps, while oil remains unaffected. The fat test is conducted by rubbing substances such as candlenut, carrot, celery, and oil on paper, with oils and candlenuts leaving transparent marks, indicating the presence of fat. The video concludes with a summary of the experiment and encourages viewers to try the tests themselves.

Takeaways

• 😀 The experiment tests for the presence of carbohydrates, proteins, and fats in various substances.
• 😀 Iodine solution is used to test for carbohydrates in substances like potato, rice, wheat flour, and sugar.
• 😀 The iodine test turns black for wheat flour and potatoes, purple for rice, indicating they contain carbohydrates.
• 😀 Sugar does not react with iodine, showing that it doesn't contain carbohydrates.
• 😀 Protein presence is tested using lime juice (which contains acid) on substances like milk, soy sauce, and oil.
• 😀 When lime juice is applied, milk and soy sauce form clumps, indicating the presence of proteins, while oil does not.
• 😀 The fat test involves rubbing substances like candlenut, carrot, celery, and oil onto paper.
• 😀 Fat-containing substances, like candlenut and oil, leave a transparent stain on the paper when exposed to light.
• 😀 Carrot and celery do not leave a transparent stain, indicating they do not contain fats.
• 😀 The experiment helps demonstrate how macromolecules can be tested using simple, common reagents and methods.
• 😀 The practical demonstration encourages viewers to replicate the tests for a better understanding of macromolecule identification.

Q & A

What is the purpose of the chemistry practical in the transcript?

The purpose of the practical is to test and identify macromolecules such as carbohydrates, proteins, and fats in various substances.

What substances are used to test for carbohydrates?

The substances used to test for carbohydrates are potato, flour, rice, and sugar.

How is the carbohydrate test conducted?

The carbohydrate test is conducted by adding two drops of iodine solution to each substance. The presence of carbohydrates is indicated by a color change in the iodine solution.

What does the iodine color change indicate in the carbohydrate test?

If the iodine turns dark or purple, it indicates the presence of carbohydrates. If there is no color change, it indicates the absence of carbohydrates.

Which substances tested contain carbohydrates, according to the script?

According to the script, potato, rice, and flour contain carbohydrates, as indicated by the iodine color change. Sugar does not contain carbohydrates, as the iodine solution remains unchanged.

What materials are used to test for proteins?

The materials used to test for proteins are oil, milk, and soy sauce.

How is the protein test conducted?

The protein test is conducted by adding two drops of lime juice to each substance. Proteins will coagulate into small clumps, indicating their presence.

Which substances tested contain protein, according to the script?

According to the script, soy sauce and milk contain proteins, as indicated by the formation of small clumps. Oil does not contain protein, as it does not form clumps.

What substances are used to test for fats?

The substances used to test for fats are candlenut, carrot, celery, and oil.

How is the fat test conducted?

The fat test is conducted by rubbing each substance onto a piece of paper and observing the result under light. Fats leave a transparent stain on the paper.

Which substances tested contain fats, according to the script?

According to the script, oil and candlenut contain fats, as they leave a transparent stain on the paper. Carrot and celery do not contain fats, as they leave no stain.

What does the transparent stain on the paper indicate in the fat test?

The transparent stain on the paper indicates the presence of fats in the substance being tested.

What conclusions can be drawn from the chemical tests performed in the practical?

The conclusions drawn are that carbohydrates are present in potato, rice, and flour; proteins are present in soy sauce and milk; and fats are present in oil and candlenut.