1.计算题- (共1题)
(1)恰好完全中和20.0 g A溶液,需加入B溶液多少克?
(2)在盛有20.0 mL A溶液的锥形瓶中滴加2滴酚酞溶液,再向瓶中缓缓倒入10.0 mL B溶液,边倒边振荡,充分混合后溶液呈无色。若取该无色混合液3.00 mL于一支试管内,再向试管内滴加1滴A溶液,试通过计算说明此时试管内溶液呈现的颜色。
2.单选题- (共3题)

A.酚酞使氢氧化钠溶液变红色 |
B.溶液中所有物质均以离子形式存在 |
C.烧杯内显示无色,说明溶液中一定存在大量H+ |
D.烧杯内显示无色,说明溶液中溶质一定有氯化钠,可能有氯化氢 |
3.选择题- (共1题)
It {#blank#}1{#/blank#}(get) dark. Paul looked out of the window and signed (叹气). Dad said he could come home by 5:30, but it was almost 7:00. Even if Dad came back, it wouldn't be much fun playing baseball in the dark. Paul walked into his room and{#blank#}2{#/blank#}(throw) his baseball into the corner. He tried to do some homework, but couldn't.
Paul couldn't understand why Dad was so busy. He threw himself into the sofa and soon fell asleep. His book{#blank#}3{#/blank#}(open) to the first page.
The next day at school, Paul didn't hand in his homework and failed a test. Mrs. Green, his teacher, asked him to stay after school. “This isn't like you. What's wrong?”
Paul just sat there quietly. “Paul, if you don't want to talk, I will. I know that something wrong with you, but you have to get it out. You need to tell someone.”
As Paul walked home, he thought of what Mrs. Green said. When Paul got home, he called his dad. But there was no answer. Then it went to voicemail (语音信箱). Paul began talking: “Dad, I can't play with you next weekend. I {#blank#}4{#/blank#}(get) lots of problems with my homework. Also, I really don't want to spend another day looking out of the window and waiting. Whenever you break our plans, Dad, it {#blank#}5{#/blank#}(hurt) me. It's not too late to rebuild our relationship, but we have to start small. I call you to ask you to help me with my homework sometime. Dad, I love you.”
As Paul ended the call, he felt much relaxed. He didn't know whether his dad{#blank#}6{#/blank#}(be) different, but it didn't matter. He himself changed. He expressed his feelings to the right person. He had a clear head as he did his homework that evening.
4.填空题- (共3题)

请将上图中所述物质的化学式填在相应的空格处:氧化物___________、酸___________、碱___________、盐___________。

老师揭秘:“空”杯子底部事先涂抹了某种无色液体,无色的“水”是事先用两种无色溶液混合而成。请回答下列问题:
(1)“空”杯内涂抹的物质可能是 溶液。
(2)此过程中发生反应的化学方程式可能是 。
(3)最终溶液为无色,能否说明该溶液一定呈中性? _(选填“能”或“不能”),理由是 __。
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【1】题量占比
计算题:(1道)
单选题:(3道)
选择题:(1道)
填空题:(3道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:4
7星难题:0
8星难题:2
9星难题:0