题目

We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons most of them move to find food more easily, but others move to get away from places that are too crowded. When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration（迁移）is probably the migration of the fish, which is called “salmon”. This fish is born in fresh water but it travels many miles to salt water. There it 酸过多是常见的胃瘸．下面是甲、乙两种常见胃药的说明摘要甲：（1）白色结晶状粉末，可缓缓分解；（2）能溶于水，水溶液里弱碱性；（3）遇酸及酸性药物则产生二氧化碳；（4）胃酸过多患者服用多见露胀气，甚至有引起胃溃疡穿孔的危险．乙：（1）与胃酸是中和作用缓慢而持久，可维持3～4小时．（2）凝胶本身覆盖子溃疡面上，具有保护作用．（3）可溶于稀酸或氢氧化钠溶液中．（1）请你推测，甲中含有的主要化学成份是______（填化学式）；乙中含有的主要化学成份是______．（填化学式）；（2）试写出甲中含有的主要化学成份引起胃胀气反应的离子方程式：______．（3）试写出乙中含有的主要化学成份与氢氧化钠溶液反应的离子方程式：______．