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“生活即学习”、“社会即教材”，化学在衣食住行、环境能源、材料科学、医疗卫生等方面越来越大地体现自己的价值。 （1）芝麻酱具有丰富的营养。如图为某品牌芝麻酱商标的一部分。其中钙、铁、硒是指 (填序号)。 A．分子 B．原子 C．单质 D．元素 （2）为防止钢铁锈蚀，制品表面刷含铝粉的防锈漆，这是因为铝在空气中能自我保护，表面形成一层致密的氧化膜。化学方程式是 。 （3）废电池中铅、镉、汞等重金属对土壤和水源的污染非常严重，小芳从废干电池中回收有关物质并进行探究。 ①她将上图电池中各物质进行分类，其中可回收的金属材料是 。（写一例即可） ②提取二氧化锰：除去二氧化锰中的少量碳粉（少量碳粉与二氧化锰不反应），可采用的方法是 。
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