2010年西藏自治区中考化学真题
2010年西藏中考化学试卷一、填空题(本大题共27分,每空1分)1. 水是由________元素和________元素组成的.2. 空气的成分按体积分数计算,其中体积分数最大的是________,其次是________.3. 同一种物质的分子,其________性质相同、二氧化碳分子是由________两种原子构成的.4. 下列微粒结构示意图:其中表示原子的是________;表示离子的是________.5. 在化学反应前后,参加反应的各物质质量总和与各生成物质量总和相等的原因是:在反应前后原子的种类没有改变,________没有增减,________也没有变化.6. 在氢气、干冰和熟石灰三...
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