7.下列叙述错误的是
A.1mol任何物质都含有约6.02×1023个原子
B.0.012 kg 12C中含有约6.02×1023个碳原子
C.在使用摩尔表示物质的量的单位时,应用化学式指明粒子的种类
D.物质的量是国际单位制中七个基本物理量之一
6.下列说法正确的是
A、在任何条件下,1mol的任何气体的体积都是22.4 L。
B、把1mol NaCl溶于1 L水中,所得NaCl溶液的物质的量浓度为1mol/L。
C、在标准状况下,1mol的任何气体的体积都约为22.4 L。
D、在化学反应中,参加反应的各物质的质量比等于其物质的量之比。
5.下列溶液中含Cl-物质的量浓度最大的是
A.10mL0.1mol/L的AlCl3溶液 B.20mL0.1mol/L的CaCl2溶液
C.30mL0.2mol/L的KCl溶液 D.100mL0.25mol/L的NaCl溶液
4.下列分散系中的分散质的微粒直径属于纳米级(1~100nm)的是
A、溶液 B、悬浊液 C、胶体 D、 乳浊液
3.关于钠的说法正确的是
A、钠是银白色金属,硬度大
B、将钠放在石棉网上用酒精灯加热,钠剧烈燃烧产生黄色火焰,生成过氧化钠
C、钠在空气中燃烧生成氧化钠
D、钠的熔点很高
2.氯水用于消毒是因为
A、氯水中含有氯分子 B、氯水中含有次氯酸分子
C、氯水中含有氯离子 D、氯水中含有氢离子
1. 下列各组物质,前者是混合物,后者是纯净物的是( )
A、淀粉与氯化氢 B、钢与浓硫酸
C、纯碱与汽油 D、胆矾与液氯
Dear Robert,
How time files! The happy days we shared often shines in my memory . As you know, my college entrance exam is approaching, which also announces the end of this sort of pressing study life. However, I intend to have a meaningful summer vacation. First, I will learn to drive to get a driving license, which is a new activity for a high school graduate in China. I will have a good rest, enjoying my hobbies. With the computer becoming more and more important, I will take some English communication ability I. After that, I Will pay a visit to some tourist attractions to widen my horizon.
That is the plan for my vacation. I am looking forward to being told about your arrangements of vacation. Give me your quick reply soon, OK?
Best wishes!
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76.go going 77.extreme extremely 78.every either/each 79.house houses
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