Two test tubes without labels contain the following substances: Option 1: ethyl alcohol and formic acid

| August 18, 2021 | education

Two test tubes without labels contain the following substances: Option 1: ethyl alcohol and formic acid; Option 2: solutions of glucose and glycerin; Option 3: formaldehyde and protein solutions; Option 4: vegetable and machine oils; Option 5: starch paste and glycerin; Option 6: solutions of glucose and ethanol; Option 7: solutions of sucrose and glucose. Suggest a way to experimentally determine the contents of each tube

Option 1: ethyl alcohol and formic acid;
Answer: The reaction of the silver mirror will take place in a test tube with formic acid.

Option 2: solutions of glucose and glycerin;
Answer: The reaction of the silver mirror will take place in a test tube with a glucose solution.

Option 3: formaldehyde and protein solutions;
Answer: The reaction of the silver mirror will take place in a test tube with formaldehyde solution.

Option 4: vegetable and machine oils;
Answer: the reaction of discoloration of a solution of KMnO4 or bromine water in a test tube with vegetable oil.

Option 5: starch paste and glycerin;
Answer: Reaction with iodine solution will give a dark blue color in a test tube with starch paste.

Option 6: glucose and ethanol solutions;
Answer: The reaction of the silver mirror will take place in a test tube with glucose solution.

Option 7: solutions of sucrose and glucose;
Answer: The reaction of the silver mirror will take place in a test tube with glucose solution.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.