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2010年11月15日，上海静安区高层住宅发生大火，短时间内急速蔓延烧透整栋建筑物，元凶极有可能是施工队所使用的保温材料聚氨酯(PU)发泡塑料等易燃材料。回答下列问题： ⑴聚氨酯发泡塑料属于__________（填“天然有机高分子”或“合成有机高分子”）材料。根据这次火灾，可推测出聚氨酯发泡塑料所具有的一条化学性质是__________。 ⑵工人施工时溅落的电火花引发了这场特大火灾，电火花所起的作用是_________（填序号）。 A．提供氧气      B．使可燃物的温度达到着火点     C．提供可燃物 ⑶氢氧化镁是一种新型的阻燃剂。当温度达到380℃时，氢氧化镁开始分解生成水，同时生成耐高温的氧化镁固体。氢氧化镁受热分解的化学方程式为__________，反应物中Mg元素的化合价为_________。
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