(江西专用)2019中考化学总复习第二部分专题综合强化专题四物质的检验、鉴别、分离、除杂与共存类型3物质的共存课件.ppt

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专题综合强化,第二部分,专题四 物质的检验、鉴别、分离、除杂与共存,类型三 物质的共存,中考专题 精讲,C,2,B,3,4,5,2隐含条件为“酸性” 题中叙述常为酸性溶液,或pH2(pH7)的溶液,或能使紫色石蕊变红色的溶液等,溶液中含有大量的H,能与酸反应物质,或能与H结合生成水或气体的离子不能大量共存。 3隐含条件为“碱性” 题中叙述常为碱性溶液,或pH10(pH7)的溶液,或能使酚酞溶液变红色的溶液等,溶液中含有大量的OH,能与碱反应的物质,或能与OH结合生成水或沉淀、气体的离子不能大量共存。 4其他条件 对一些给出物质的微观构成的离子共存试题,不仅要考虑离子共存的条件,还需考虑溶液中阳离子与阴离子所带电荷数量相等。,6,

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