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Anonymous users2024-01-24A. In the process of salt agglomeration, no new substances are generated, which is a physical change, so the choice is wrong;
B. There is no new substance formed in the process of boiling water, which is a physical change, so the option is wrong;
C. In the process of gas combustion, new substances carbon dioxide and water are generated, which belong to chemical changes, so they are prepared as options;
D. There is no new substance generated in the process of breaking the porcelain bowl, which is a physical change, so the choice is wrong, so choose C
A. In the process of boiling water, only the state changes, and no new substances are generated, which is a physical change B. Only the shape is changed during the breaking of the porcelain bowl, and no new substances are generated, which is a physical change C. There are new substances such as carbon dioxide in the process of gas combustion, which is a chemical change D. There is no new substance generation in the process of salt agglomeration, which is a physical change, so choose C
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
Answer C filtered soybean milk, juice extraction, activated carbon adsorption refrigerator odor did not generate new substances, which belongs to physical changes, and bread deterioration is a slow oxidation of bread, which is a chemical change, so choose C
A. There are new substances such as carbon dioxide generated during the combustion process of liquefied gas, which belongs to chemical changes B. There are no new substances generated in the process of squeezing juice, which belongs to physical changes C. There are new substances generated in the process of bread mold, which belongs to chemical changes D. There are new substances in the process of kitchen knife rust generation, which belongs to chemical changes so choose B
B.Boiling water boils, this is just the water temperature reaches 100 degrees and continues to absorb heat so it boils, of course, 100 degrees water does not boil without heating. Although water changes from liquid to gaseous, its chemical structure remains unchanged. >>>More