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Anonymous users2024-01-24A. New substances are generated in the process of being burned and blackened, which is a chemical change error;
B. There is no new substance generated in the process of sugar agglomeration, which is a physical change.
C. Food can produce amino acids and other substances in the process of digestion in the stomach, which is a chemical change error;
D. Gas combustion can produce carbon dioxide and water, which is a chemical change Wrong, so choose B
A. There is no new substance generation in the process of squeezing juice, which belongs to physical change B. There are new substances that are harmful to the human body in the process of food deterioration, which belongs to chemical changes C. There are new substances in the process of rusting in the iron pot Rust is generated, which belongs to chemical changes D. New substances such as carbon dioxide are generated in the process of gas combustion, which belongs to chemical changes Therefore, choose A
A. Natural gas combustion produces water and carbon dioxide, which is a chemical change, so the choice is wrong; >>>More
A. Biogas combustion produces carbon dioxide and water, which is a chemical change, so the choice is wrong; >>>More
White vinegar volatilizes, and nothing new is generated.
A. During the combustion process of liquefied gas, new substances such as carbon dioxide are generated, which is a chemical change B. The water in the refrigerator only changes its state during the freezing process, and no new substances are generated, which is a physical change >>>More