问题
填空题
“岩盐之都”河南叶县盛产食盐。食盐的主要成分NaCl由______(填“分子”、“原子”或“离子”)构成；除去食盐水中泥沙等不溶性杂质的方法是____________；高温电解食盐水可制烧碱：2NaCl+2H2O
2NaOH+H2↑+X↑，则X的化学式为_________。
答案
离子；过滤；Cl2
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“岩盐之都”河南叶县盛产食盐。食盐的主要成分NaCl由______(填“分子”、“原子”或“离子”)构成；除去食盐水中泥沙等不溶性杂质的方法是____________；高温电解食盐水可制烧碱：2NaCl+2H2O2NaOH+H2↑+X↑，则X的化学式为_________。
离子；过滤；Cl2
Mr. Smith is a good teacher. He is . There fifty students in class. Mr. Green and his students are friends, too. Now some of the students on the playground. Bill and Mike . Tom and John are jumping. Mary and Lucy are a kite. girls are playing . Mr. Smith is playing them.
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