1. (2024六下·长兴期末) 厨房中的这些变化属于物理变化还是化学变化，请用线连起来。

 饭菜变质                                                                                             生米煮成熟饭

 煤气燃烧                                    化学变化                                            食盐放入热菜中消失不见

 用厨余垃圾堆肥                                                                                   铁锅生锈

 虾放入热水中变色                     物理变化                                            打开可乐瓶冒出泡泡

 水烧开了                                                                                             用刀切开青菜