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（1）请举一例说明空气中含有氧气______． （2）请分析下列过程中，哪些属于物理变化，哪些属于化学变化． ①打开石油液化气，②点燃液化气，③将水烧开，④淘米、洗菜，⑤将鸡蛋浸泡在食醋中，⑥滤出米饭中的米汤，⑦剩饭变馊 属于物理变化的是（填序号，下同）______，属于化学变化的是______， （3）下列是家庭生活中常用的物质，请写出鉴别它们的一种方法（简述现象、结论）： （导线）铁丝与铜丝______， （调料）白糖与食盐______， （用水）自来水与纯净水______．
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