题目

Fallingwater is a house built over a waterfall in Southwestern Pennsylvania. Frank Lloyd Wright, America’s most famous architect, designed the house in 1935. It instantly became famous, and today it is a National Historic Landmark.In-Depth TourThe tour is best if you desire a greater understanding of what Wright was seeking to create with his masterwork. The number of visitors on each tour is limited and photography is permitted for personal use only. Children nine years and older may be accompanied by adults on this tour.$65.00 per person (Available by advance ticket purchase only)Daily fro不同类别的物质间存在着一定的关系，如图1、2所示．（“-”表示相连的两种物质能发生反应，“→”表示某种物质可转化为另一种物质．）（1）碳酸钠溶液、氢氧化钠溶液和稀盐酸之间的变化关系如图1所示，回答下列问题：①乙物质是______，它的一种用途是______．②写出“乙→丙”的化学方程式______．（2）图2能体现某些物质间变化关系的是______．（填标号）