成都 地理信息:钙及其化合物间的互相转化

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请你根据已有知识,在图中用箭头表示物质间可能发生的转化,写出相应的化学方程式,并找出转化过程中元素化合价发生改变的反应。
CaCO3
CaO Ca(OH)2

Ca CaCl2
`````````````````````````````CaCO3``````````````````````````CaO ````````````````````````````````````Ca(OH)2 `````````````````````````````````````````````````````````````Ca```````````````````````````````````````CaCl2