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48 Experiment 3. Proof of sucrose hydrolysis. Take the two test tubes. Place 2 drops of sucrose solutionin the first tube, add 2 drops of HCl and 10 drops of water. Gently heat for 1 minute. The tube should be kept slanted and shaking the solution so that it does not throw out the liquid when boiling. Pour half of the solution into a second test tube and add 10 drops of NaOH, 5 drops of water and 1 drop of CuSO 4. Heat the top. What do you observe? Explain these phenomena. Make a Selivanov test in the first test tube. Add a grain of resorcinol, 2 drops of conc. HCl into this test tube and heat to boiling. What are you observing? Write the equation for the hydrolysis of sucrose and the equations underlying the Trommer test and the Selivanov test. Experiment 4. A qualitative reaction to starch. Place 5 drops of 0.5% starch paste and 1 drop of iodine solutionin a test tube. What happens to the solution? Add about 2 ml of water and heat the solution. What are you watching? Then refrigerate under the tap. Describe your observations. LESSON 22. FINAL CONTROL № 3 The final control 3 includes the following sections: 1. Classification and properties of biologically active low-molecular organic substances. 2. Properties of oxygen-containing organic compounds. 3. Chemistry of biologically active heterofunctional and heterocyclic low- molecular organic substances. 4. Simple lipids. 5. Complex lipids. 6. Monosaccharides. 7. Oligosaccharides and polysaccharides. LESSON 23. CHEMISTRY OF AMINO ACIDS Required basic level of knowledge. Structure and properties of carboxylic acids. The structure and properties of amines. Amphotericity. Acidic properties, basic properties. Questions for the preparation for the lesson. 1. Amino acids. Definition. The general formula of α-amino acids.