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Anonymous users2024-01-24AA, the porcelain bowl is broken, no new substances are generated, it is a chemical change, so the choice is correct;
B. Rust is a new substance and belongs to chemical changes, so the choice is wrong;
C. Vegetable decay produces harmful substances, which is a chemical change, so the choice is wrong;
D. The combustion of natural gas produces carbon dioxide and water, which is a chemical change; Therefore, the option is incorrect; So 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
A. The porcelain bowl is broken, and no new substances are generated, which is a chemical change, so the choice is correct; >>>More
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
There is no new substance generation in the juice squeezed by B, so it is a physical change, and there is a new substance generation in apple rotting and kitchen knife rusting, which is a chemical change, so B. is chosen