1.计算题- (共2题)
（1）CO（NH2）2中共含有________（写数字）种元素。
（2）CO（NH2）2的相对分子质量是___________。
（3）若CO（NH2）2中含有3g氮元素，则该CO（NH2）2的质量为________g（计算结果精确到0.1）。
求：（1）混合物中氧元素的质量分数是多少（计算过程中保留两位小数）。
（2）如果给混合物加热使其发生反应，一段时间后，测得剩余物质含有KClO3、MnO2和KCl，其剩余物质的总质量为95克。求此剩余物质中Mn元素的质量分数？
2.单选题- (共15题)
| A．一种元素与另一种元素的原子一定不相同 |
| B．凡含有氧元素的物质就是氧化物 |
| C．某物质中只含有一种元素，该物质一定是一种单质 |
| D．含有多种元素的物质一定是混合物 |
| A．原子是微小的实心球体，可以再分 |
| B．单个SO2分子有刺激性气味 |
| C．纯净的氢气在氧气中完全燃烧后，生成的物质是由同一种粒子构成的 |
| D．离子是原子失去电子后生成的粒子 |
①2H ②2NH3 ③SO2 ④O2 ⑤Mg2+ ⑥2OH﹣ ⑦H2O．
| A．表示离子个数的是⑤ | B．表示离子所带电荷数的是④⑤ |
| C．表示分子中原子个数的是③⑦ | D．表示分子个数的是①② |
| 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．29.4g | B．27.4g | C．28g | D．32.6g |
3.选择题- (共3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)
和
分别表示两种不同元素的原子，则其中表示混合物的是______，表示纯净物的是______，表示单质的是______，表示化合物的是______，可能是氧化物的是______．
（1）标出下列化学式中划线元素的化合价______
KClO4 Fe Na2SO3 Na2MnO4
（2）如图是A、B、C、D四种粒子的结构示意图．
①B原子中，X=_________________，
②A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氩气____________；②4个二氧化硫分子____________；
③氮气____________；④7个银原子____________；
⑤3个硫酸根离子________；⑥氧化铁中铁为+3价__________．
（1）可用作净水剂的是_________。
（2）食品包装中可用作防腐气体的单质是_________。
（3）医院用作给病人消毒的是_________。
（4）抢救病人供呼吸的气体是_________。
（5）区分硬水和软水一般使用_________。
5.实验题- (共1题)
（1）写出指定仪器的名称：①___________ ② ___________
（2）下面四种途径都可以得到氧气：
①写出实验室中通过甲、乙、丙三种途径制取氧气的文字表达式：
甲_______________________________________；
乙_______________________________________；
丙_______________________________________；
以上三个反应的共同点是_______________________________________。
工业上通过丁途径制取氧气属于_____________（填：物理或化学）变化。
②化学实验的绿色化就是以绿色化学的理念和原则来指导实验工作。从实现原料和反应过程的绿色化考虑，你认为在中学化学实验室中，甲、乙、丙三种制取氧气的途径中，_________(填“甲”、“乙”或“丙”)途径更体现化学实验的绿色化追求。
（3）实验室用高锰酸钾制取氧气时，可选用的发生装置是__________(填字母代号，下同)。若既想收集到较纯的氧气，又想在实验中能观察到生成氧气的速率，应该选用的收集装置是__________。用该方法收集氧气完毕后，停止加热时的操作顺序是先____________________，然后____________________， 以防止水倒吸进入热的试管中，造成试管破裂。
（4）实验室常用石灰石（固体）和稀盐酸（液体）在常温下反应来制取二氧化碳气体，通常情况下二氧化碳的密度比空气的密度大，且能溶于水。实验室制取二氧化碳时，选择的发生装置是__________，收集装置可选用__________。
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【1】题量占比
计算题:(2道)
单选题:(15道)
选择题:(3道)
填空题:(4道)
实验题:(1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：12
7星难题：0
8星难题：7
9星难题：3