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【单选题】
下列溶液中，pH值最小的是( )。A.
O．2mol.L-1氨水中加入等体积的0．2mol.L-1HCl
B.
0．2mol.L-1氨水中加入等体积的蒸馏水
C.
0．2mol.L-1氨水中加入等体积的0．2mol.L-1H2SO4
D.
0．2mol.L-1氨水中加入等体积的0．2mol.L-1NH4CI
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【单选题】此题为课本第83-84页的Reading Comprehension.此处选项未录入文字,题目请查看课本。请选择自己认为正确的选项。请阅读Unit 5 Text B并完成下题。请使用scanning, identifying key words, making inferences等阅读技巧来完成练习。建议阅读时间:8分钟 第1题
A.
1
B.
2
C.
3
D.
4
【简答题】按初中化学课本（人教版）第84页图5-8的装置，取一定量的木炭和CuO的混合粉末进行实验，实验前经反复检查该装置各部分的气密性，验明不漏气． 在实验前后分别对两个试管里的物质进行了称量，某次实验数据如下： 反应前的质量/g 反应后的质量/g 反应前后的质量差/g 试管+固体混合物 69.8 65.8 △m 1 =______ 试管+石灰水 118.8 122.6 △m 2 =______ （1）计...
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【简答题】Complete the notes below. Choose NO MORE THAN THREE WORDS from Reading Passage 2 for each answer. Write your answers in boxes 17-19 on your answer sheet. Three ways in which the WSPU raised money: the...
【简答题】Directions: Complete the passage with the words in the box.. Each word can only be used once. Note that there is one word more than you need. A. demonstrating B. devote C. productive ...
【简答题】Complete the passage by choosing the proper words in the box. Each word can only be used once. Note that there is one word more than you need. A．political B．supported C．gossip D．set E. contemporary F....
【单选题】Wouldn’t it be __ complete success if the two sides lived in__ peace with each other?
A.
a;/
B.
the; /
C.
a; the
D.
the; the
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