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石灰石是一种常见的矿石，石灰石在我省许多山区、丘陵地带很容易找到，应该合理利用该矿产资源。

（1）石灰石的主要成分是____________；

（2）利用石灰石比较坚硬、难溶于水的性质，可开采石灰石作为_________________；

（3）利用石灰石分解制得的生石灰作为食品的_____________；写出该分解反应的化学方程式_______________________________________。