2015长沙市中考化学试题及答案
2015年长沙市初中毕业学业水平考试试卷理科综合（化学部分）一、选择题（苯大题共15小题，每小题3分，共45分．每小题只有1个选项符合题意．）1下列变化中，属于化学变化的是（）lA水结冰 B白酒挥发 C饭菜变馊 D玻璃杯打碎2下列实验基本操作正确的是（）3下列关于空气成分的说法错误的是（）A空气的成分按体积计算，氧气约占21%B稀有气体常用于医疗急救C焊接金属时常用氮气作保护气D二氧化碳是植物光合作用的重要原料4今年，我国西藏尼泊尔边界地区发生了多起地震，灾区饮用水被严重污染，为确保灾民的生活用水安全，急需对水进行净化处理口下列处理措施中，不属于净水方法的是（ ）A吸附沉淀 B过滤 C静置沉淀...
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