用化学知识解释某做法······························
问题描述：
用化学知识解释某做法······························
1.冬天建筑施工时往砂浆掺氯化钙以防冻.
why?
2.切过咸菜铁质菜刀更容易生锈.
why?
答
1:冻是为什么?是因为里面含有水份,而氯化钙是吸水剂,在砂浆中掺入氯化钙,可将水份吸收,而防冻.
2：咸菜上有许多种离子,吸附在菜刀上会发生更快的电解反应,加快菜刀的生锈.