皮皮学,免费搜题
登录
搜题
【简答题】
唯一使孩子们觉得重要的是,他们多久才能到他们的叔父的场去。
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】N A 表示阿伏加德罗常数,下列说法错误的是
A.
质量为a g的R分子,其相对分子质量为a N A
B.
12g石墨含有 N A 个碳原子
C.
31g白磷分子(P 4 )中含有6 N A 个共用电子对
D.
30g葡萄糖含有 N A 个碳原子
【单选题】下列叙述中正确的是
A.
摩尔是物质的质量的单位
B.
碳的摩尔质量为12g
C.
阿伏加德罗常数约为6.02×10 23 mol -1
D.
一个碳原子的质量为12g
【简答题】算一算,比一比,你发现了什么? (1)9+(   )=13 13-9=(   ) (2)9+(   )=17 17-9=(   ) (3)9+(   )=12 12-9=(   ) (4)9+(   )=16 16-9=(   )
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A. meet
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A.
【简答题】17,10,9,6,1,2,( )。
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A. meet
【简答题】1,3,5,9,17,31,57,( )
【单选题】下列说法错误的是(  )
A.
6.02×10 23 是阿伏加德罗常数的近似值
B.
阿伏加德常数个微粒的物质的量是1mol
C.
1mol碳-12原子的质量为12g
D.
硫酸的摩尔质量是98克
【简答题】Translate the following sentences into Chinese. 1.Owing to our mutual efforts, we are able to bridge the gap and put the deal through. 2.We appreciate your Order No. 486 for 1000 tons Dongbei rice, an...
相关题目: