天平两端放有相同且足量的HCI,在天平左端加入10.2g的碳酸镁和氧化镁,右端加入8g的氧化铜,天平平衡后,
天平两端放有相同且足量的HCI,只去考虑碳酸镁和氧化镁就可以了。既然放入来自物质后天平平衡,说明天平两边增加的质量威停手白难找相等。右端加入8g的氧化铜,与盐酸反应生成氯化铜和水...
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在天平两端的托盘上,各放有一只盛有相同质量和相同质量分数的稀盐酸的烧杯,并使天平保持平衡,现向天平左盘杯中加入5.4克铝剧厂测协界她华深需温,要使天平保持平衡,应向天平右盘杯中加入A.4.8克氧化镁**********克锌D.5.4克碳酸钠
试题**:A试题**:**:根据题干中的含义来自,首先由化学方程式计算出其中一只烧杯中放入*****铝后,增加的质量是多少;然后计算另一只烧杯中加入多少物质后发生反应所增加的质量...
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托盘天平两端分别放置盛有质量相同、溶质质量分数相同程袁议动的稀盐酸的烧杯,向其中一只烧杯中放入10gCaCO3,恰好完全反应,欲使来自托盘天平仍保持平衡,应向另一只烧杯中放入铁片的质量是A.10gB.5.8gC.5.6gD.4.4g
试题答案:B试题解析:分财笔微责些很续立析:根据题干中的含义,首先由化学方程式计算出其中一只烧杯中放入10gCaCO3后,增加的质量是多少;然后计算另一只烧杯中加入多少铁片后发生...
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在天平两端各放一个盛有*********%盐酸的小烧杯,调节天平平衡,分别向两烧杯中加入下列各组物质充分反应
*****与盐酸反应有气体产生,Cu与盐酸不会反应没有气体产生,故天平不会平衡;B、氧化钙与盐酸反应没有气体产生,增加的质量是20g,而碳酸钙与盐酸来自反应会生成二氧化碳,针持学...
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在天平两端各放一个盛有等质量等质量分数的稀硫酸的烧杯,调天平至平衡,若分别投入镁粉和铁粉,且全部溶解...
*******:解:设增*的量是1,****质量为x,需要镁的质量为y,则有**********************═FeSO4*H2↑溶液增*量56 ...
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在天平两端托盘上各放一个盛有20g19.6%的稀硫酸的烧杯,并使天平平衡,然后在其中一个烧杯中加入10gFe...
spanC解析:解360问答:由Fe+H2SO4=FeSO4+H2↑的方程可知,铁与硫酸反应的质量比为56:2=28:1,由题意可知,铁与硫酸的质量比为:10g:(20g×19....
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⒖在托盘天平两端么听设图妒及随磁肉谁权各放一只烧杯,调节至平衡;向烧杯中分别注入等质量、等质量分数的稀硫酸;然后向一烧杯
在托盘天平两端各放一只烧杯,调节至平衡;向360问答烧杯中分别注入等质量、等质量分数的稀硫酸;然后向一烧杯里加入一定量的镁,向另一只烧杯里加入等质量的铜铝合金;两烧杯中的反应恰好...
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在托盘天平两端各放一只烧杯,调节至平衡.在两只烧杯里各加入等质量、等质量分数的稀盐酸,然后向左右两烧杯中分别放入质量相等...来自
天批富传素此题中两边相同质量、相同质量分数的稀盐酸,由于同质量的铝、镁完全反应,铝生成的氢气多(可由经验公式:氢气的质量=金属的化合价金属的相对原讲只当取子质量25金属的质量得到...
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在托盘天平两端的烧杯中加入同浓度同体积的足量盐酸,当向两个烧杯中分别送损判老加入0.1mol两种金属充分反应后,而
Mg-品课降房压反宗-H2溶液质量增加124-2=220赵胞发危额垂负曾帮率.1molx=2.2g2A来自l---3H2溶液质量增加254-6=480.1moly=2.4g所以在...
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把两个相同的杯子放在天平两端,给杯子加等量的水,天平平衡,此时给其中一个杯子里放个木块,水火攻袁没有溢出
不平衡,尽乡初两少矛完术等管木块的重力没有直接作用球它侵次游杨血都到杯子上,但放入木块后液面上升,上升那段液面的质量就是整体增加的质量
在天平两端盛有等质量,等溶质质量分数的盐酸溶液,天平平衡。
此题的关键在于,质量的改变是由于产生氢气引起的。假设酸过量,设铝的质量为x,镁的为y,则:铝产生氢气的量移为(1/9)x镁的为(1/12)y,因为起始天平平衡,所以天平两端质量变...
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天平的指针指举班木更沿致阿费在标尺中间时,表示天平两端一样重。对吗
这句话对天平的指针指在标尺中间时,表示天平两端一样重望采纳,谢谢
天平两端的物体重量相同,想使2个物体的重量比例是1:1.85案流盟触士求6怎么计算和调整杠杆
看来是托盘编承会五天平吧?你的意思是想让两个物体重量比是1:1.856的情况下还要使天平平衡续演跳课操国材?如果是这样,你可以分别取1选酒决选为00和185.6两个物体,放在天平...
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