1. (2023六上·乳源期中) 将右边的现象与其相应的变化用线条连接起来。

                                                 盐溶解于水

         物理变化（没新物质产生）                烟花绽放

                                                 火柴燃烧

                                                 铁水变钢锭

         化学变化（有新物质产生）                水的三态变化

                                                 小苏打遇到酸冒气泡