小丽同学建立了微型化学实验室，她收集的物质有：①镁条 ②氧化镁 ③氢氧化钠 ④小苏打 ⑤醋酸 ⑥葡萄糖等，其中属于碱的物质是____ （填化学式），属于有机化合物的是____ （填序号），在食品工业中作为发酵粉主要成分的物质是____ （填序号）．不同类别物质间存在一定关系．镁、氧化镁和醋酸之间的变化关系如图所示（“﹣”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）．回答下列问题：

（1）甲物质是____（填完整名称）；

（2）写出“乙→丙”反应的化学方程式____ ．

文中共有10处语言错误，每句中最多有两处。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注: 1）每处错误及其修改均仅限一词；

2）只修改10处，多者（从第11处起）不计分。

    It was 6 pm when we arrived Belfast, so we went straight to the hotel that we booked online to check in after we got on the plane. On our way to the downtown, the taxi driver brief introduced the city, which had been in chaos for almost 30 years until the end of next century. After dropped our bags, we wandered around in the streets. The city was peacefully and people seemed to be enjoying their life very much. The place that we had our dinner was called “The Crown”, a pub dated back to 1826, when the first train ran from Belfast to Lisburn. We met two European girls having Chow Mein, fried noodles, when we were having a rest in the hall of the hotel later. They told us they have bought the noodles in a Chinese restaurant named Eastern Land. We decided not to go there the next evening so that we could taste it.