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我国晋代炼丹家、医学家葛洪所著《抱朴子》一书中记载有:“丹砂烧之成水银.积变又还成丹砂.”这句话的意思是:①红色的硫化汞晶体(丹砂)在空气中灼烧有汞和硫蒸气生成;②汞和硫在一起研磨生成黑色硫化汞;③黑色硫化汞隔绝空气加热变成红色的硫化汞品体.
(1)硫化汞晶体是______色的,这是它的______性质.
(2)③中所发生的是物理变化还是化学变化?______.为什么?______.
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