The following changes that occur in the kitchen are physical changes: 1 Guess rust 2 Food rot

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. 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

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