1.计算题- (共1题)
（1）C7H5O2Na的相对分子质量是__________；
（2）C7H5O2Na中碳、氧两种元素的质量比是__________；
（3）14.4g苯甲酸钠中含有钠元素多少克? （写出计算过程）_______。
2.单选题- (共3题)
| A．柠檬酸属于氧化物 |
| B．柠檬酸是由6个碳原子、8个氢原子和7个氧原子组成的 |
| C．柠檬酸中氧元素的质量分数最大 |
| D．柠檬酸中碳、氢、氧三种元素的质量比为6：8：7 |
| A．因为水有自净能力，生活污水可以不经处理直接排放 |
| B．地球上的水资源丰富，但可供利用的淡水资源有限 |
| C．为了人类的生存和发展，人人都应爱惜淡水资源 |
| D．水体污染，破坏了水体生态系统，还会危害人体健康 |
B. 闻药品味道
D. 滴加液体
3.选择题- (共4题)
A. show me the building, B. was rising , C. make a living, D. could hardly sleep E. took my taxi F. pay you |
Twenty years ago, I drove a taxi for a living. One time in the middle of the night, an old lady in her 80s {#blank#}1{#/blank#} . She gave me an address, and then asked, “Could you {#blank#}2{#/blank#}?”
“It's not the shortest way,” I answered quietly .
“Oh, I don't mind,” she said. “I'm in no hurry. I'm on my way to a hospice(临终医院). I {#blank#}3{#/blank#} The doctor says I don't have very long.”
I quickly reached over and shut off the meter(计价器). For the next two hours, we drove through the city. She{#blank#}4{#/blank#}where she had once worked, the neighborhood where she had lived, the place where she danced as a girl. As sun {#blank#}5{#/blank#}, we got to the hospice.
“How much should I {#blank#}6{#/blank#}?” she asked, reaching into her purse.
“Nothing ” I said.
“You have to{#blank#}7{#/blank#} ” she answered.
“Oh, there are other passengers,” I answered.
“You gave an old woman some moment of happiness”. She said: “Thank you.”
I drove into the fine morning light. Behind me, a door shut. It was the sound of closing of a life. I drove aimlessly, lost in thought. For the rest of the day, I {#blank#}8{#/blank#}. What if that woman had got an unfriendly drive, or one who was impatient to his shift? What if I had refused to take the run?
A. show me the building, B. was rising , C. make a living, D. could hardly sleep E. took my taxi F. pay you |
Twenty years ago, I drove a taxi for a living. One time in the middle of the night, an old lady in her 80s {#blank#}1{#/blank#} . She gave me an address, and then asked, “Could you {#blank#}2{#/blank#}?”
“It's not the shortest way,” I answered quietly .
“Oh, I don't mind,” she said. “I'm in no hurry. I'm on my way to a hospice(临终医院). I {#blank#}3{#/blank#} The doctor says I don't have very long.”
I quickly reached over and shut off the meter(计价器). For the next two hours, we drove through the city. She{#blank#}4{#/blank#}where she had once worked, the neighborhood where she had lived, the place where she danced as a girl. As sun {#blank#}5{#/blank#}, we got to the hospice.
“How much should I {#blank#}6{#/blank#}?” she asked, reaching into her purse.
“Nothing ” I said.
“You have to{#blank#}7{#/blank#} ” she answered.
“Oh, there are other passengers,” I answered.
“You gave an old woman some moment of happiness”. She said: “Thank you.”
I drove into the fine morning light. Behind me, a door shut. It was the sound of closing of a life. I drove aimlessly, lost in thought. For the rest of the day, I {#blank#}8{#/blank#}. What if that woman had got an unfriendly drive, or one who was impatient to his shift? What if I had refused to take the run?
4.填空题- (共4题)
（1）氧元素属于 元素（填“金属”或“非金属”）；铝元素的质子数是 。
（2）C粒子属于 （填“原子”、“阴离子”或“阳离子”）；若D为原子，则ⅹ= 。
（3）A、B、C、D中属于同种元素的是 （填序号）。
（4）A粒子的化学性质与B、C、D中哪一种粒子的化学性质相似 （填序号）。
（1）请用化学用语填空：
①地壳中含量最多的元素__________；②两个氢原子__________；
③三个二氧化硫分子__________；④四个氢氧根离子__________；
⑤空气中含量最多的气体__________；⑥人体中含量最多的物质__________。
（2）在符号“H2O”中H正上方的“＋1”表示___________________，H右下角的“2”表示_________________。
（1）自然界中的水都不是纯水，利用沉淀、 26 、吸附和蒸馏等方法可以净化水。
（2）有些村庄打深井取用地下水，可用 27 区分地下水是软水还是硬水，常用 28 的方法来降低水的硬度。
（3）小明同学为了探究水的组成，邀请你一起参加水的电解实验，发现两极上都有气泡冒出，其中正极与负极上的气体体积之比约为1:2，经检验，正极上产生的气体是 29 ，负极上产生的气体是 30 。得出水是由 31 两种元素组成的结论。
（4）“节约用水，从我做起。”请你任举一例生活中节约用水的措施： 32 。
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【1】题量占比
计算题:(1道)
单选题:(3道)
选择题:(4道)
填空题:(4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：6
7星难题：0
8星难题：1
9星难题：1