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1、2023届衡水金卷先享题调研卷英语
2、2023衡水金卷先享题调研卷答案辽宁化学
3、衡水金卷2023调研卷文数甲卷B三
将适量的下列物质,分别投入等质量、等溶质质量分数的稀盐酸中,恰好完全反应后,产生的气体全部逸出,所得溶液中的MgCl2的质量分数最大的是( )
A. Mg
B. MgO
C. Mg(OH)2
D. MgCO3最新问答:
解法一:由于四者与等量的盐酸反应,所以反应后生成的氯化镁质量相等,而反应后溶液的溶剂中所含的水有一部分来源于盐酸中的水,且这部分水相等,依据四者与盐酸的反应方程式Mg+2HCl═MgCl2+H2↑;MgCO3+2HCl=MgCl2+H2O+CO2↑;Mg(OH)2+2HCl=MgCl2+2H2O;MgO+2HCl=MgCl2+H2O,可以看出反应时只有镁与盐酸反应时无水生成,其它均有水生成,也就是镁与盐酸反应后所得的溶液中的溶剂只有盐酸中的水,而其它均还含有生成的水,所以反应后溶质质量分数最大的是镁;
解法二:根据反应的化学方程式,可判断与等质量的盐酸恰好完全反应后溶液质量的增加值为:
Mg+2HCl═MgCl2+H2↑ 溶液质量增加
2473 95 2 24-2=22
MgCO3+2HCl=MgCl2+H2O+CO2↑溶液质量增加
84 73 95 1844 84-44=40
Mg(OH)2+2HCl=MgCl2+2H2O 溶液质量增加
58 73 95 36 58
MgO+2HCl=MgCl2+H2O 溶液质量增加
40 73 95 18 40
根据反应后溶液质量的变化可知,与镁反应时溶液增加量最小,即与镁恰好完全反应时所得溶液的质量最小,而反应后所得溶质氯化镁的质量相同,因此,与镁反应后所得溶液的溶质质量分数最大;同理分析可得与氢氧化镁反应后所得溶液的溶质质量分数最小;氧化镁和碳酸镁分别与等质量的盐酸恰好完全反应后溶液的溶质质量分数相等.
故选A.
点评:
本题考点: 酸的化学性质;根据化学反应方程式的计算.
考点点评: 本题的解决技巧在于利用化学变化前后元素质量不变,判断出反应后所得溶液中溶质质量相等,然后计算反应后溶液的质量,这样处理使得本题的解答简便很多.
初二英语 阅读短文,根据短文内容和首字母提示完成单词,使短文意思完整、通顺
When you think of American culture, what first comes to your mind? McDonald’s? Coca-Cola? Disneyland? Michael Jordan? Many people think American (1)c_________ is a collection of popular symbols like these. In fact, these symbols are only one small (2)p_________ of American culture — pop culture.
What is pop culture? Well, pop is (3)s_________ for popular. The origin(起源) of pop culture (4)b_________ with popular movies, television shows, music stars and famous athletes. Pop culture is also improved (5)b_________ business and advertising. The most common examples of American pop culture appear among high school and college students. The fashion set by famous people (6)q_________ becomes part of young people’s lifestyles.
American pop culture has (7)i_________ the whole world. One main reason for its popularity is that English is an international (8)l_________. Since language and culture go together, (9)_________ English means becoming realized of English-speaking countries’ cultures. Also, America is a world leader in movies, music and magazines. (10)F_________, pop culture is easy to package and export (包装和输出). For that reason, it is easy to “sell” to the world.最新问答:
2.part
3.standing
4.begins
5.between
6.quickly
7.influced
8.language
9.spoken
10.Finally
2.part
3.short
4.begins
5.by
6.quickly
7.influenced
8.language
9.(首字母呢?)knowing? handling? or else
10.Furthermore
2.part
3.standing
4.begins
5.between
6.quickly
7.influced
8.language
9.spoken
10.Finally
2.part
3.short
4.begins
5.by
6.quickly
7.influenced
8.language
9.learning
10.Finally