1.推断题- (共1题)
据此，请回答下列问题：
(1)物质H的化学式为_____
(2)写出下列化学方程式：B+Na2CO3→C+D_______________________________。
(3)D+E→F+G的基本反应类型_________________。
2.科学探究题- (共1题)
小张同学认为，白色粉末中一定含有硫酸钡；
小李同学认为，小张同学的结论不准确，其理由可用化学方程式表示为______________。
针对上述两名同学的观点，小刘同学进一步设计如下实验方案进行探究：
(1)步骤③中，滴入酚酞溶液后，若滤液E为红色，则滤液E中除酚酞外还一定含有的溶质是_______(填化学式，下同)，由此得出原白色粉末成分组成的结论是______________。
(2)小王同学认为，只需要取少量滤渣B，加入过量的稀盐酸，若看到的现象是白色不溶物部分溶解，且有气泡产生，就足以说明原白色粉末的成分是__________________。
3.计算题- (共2题)
⑴稀盐酸中溶质的质量为___________g。
⑵原混合物中NaCl的质量分数为________________(结果保留一位小数)。
4.单选题- (共10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．石墨有金属光泽，可用来做干电池的电极 |
| B．活性炭具有吸附性，可用于吸附装修产生的有害气体 |
| C．氢氧化钠能与油脂反应，在生活中可用来除油污 |
| D．熟石灰具有碱性，可用于改良酸性土壤 |
| 序号 | 实验操作 | 现象 | 结论 |
| A | 向久置空气中的NaOH固体滴加稀盐酸 | 产生气泡 | NaOH已部分变质 |
| B | 向某无色溶液滴入紫色石蕊试液 | 溶液变蓝 | 该溶液一定是碱溶液 |
| C | 将燃着的木条伸入盛满某气体的集气瓶中 | 木条熄灭 | 该气体是CO2 |
| D | 向某溶液中加入AgNO3溶液和稀HNO3 | 产生白色沉淀 | 该溶液中含有Cl- |
| A．A | B．B | C．C | D．D |
A.
加热KClO3和MnO2固体混合物B.
向Ca(OH)2溶液中通入CO2至过量C.
向一定浓度的NaOH溶液中加水稀释D.
将等质量的Mg和Al分别与过量等浓度的盐酸反应，则a为Mg，b为Al5.选择题- (共2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?
6.填空题- (共5题)
请回答：
(1)从微观角度看，图中四种物质是由__________构成的。
(2)C为尿素[CO(NH2)2]，农业上常用作______(填“氮”、“磷”或“钾”)肥。
(3)该反应的化学方程式是__________________________________。
(l)焊锡是锡铅合金，把铅加入锡中制成合金的主要目的是________。
(2)铝制品表面易形成致密氧化铝薄膜，从而阻止铝进一步被空气氧化，但氧化铝能溶于酸。写出氧化铝与稀硫酸反应的化学方程式______________________________。
(3)在氯化铜和氯化亚铁的混合溶液中加入一定量的锌粉，充分反应后过滤，向滤出的固体中滴加稀盐酸，没有气泡产生。下列判断正确的是（______）
| A．滤出的固体中一定含有铜，可能含有铁和锌 |
| B．滤出的固体一定含有铜和锌，一定不含铁 |
| C．滤液中一定含有氯化锌和氯化亚铁，可能含有氯化铜 |
| D．滤液中一定含有氯化锌、氯化亚铁、氯化铜 |
(1)t1℃时，A、B、C三种物质的溶解度由大到小的顺序是________________。
(2)t2℃时，向50 g水中加入20gA物质，充分溶解后，所得溶液是________ (填“饱和”或“不饱和”)溶液。
(3)将t3℃时等质量A、B的饱和溶液分别降温至t2℃，对所得溶液的叙述正确的是_______(填序号)。
①溶质质量：A>B ②溶剂质量：A<B ③溶质质量分数：A=B
(l)日常用品尼龙手套、铝壶、不锈钢刀、纯棉桌布中，主要用有机合成材料制成的是_____。
(2)为了减小燃烧化石燃料对环境的影响，人们一方面开发利用清洁高效的新能源，另一方而提倡“低碳生活”。下列符合“低碳生活”的做法是___________(填数字序号)。
①人走灯灭 ②少用一次性筷子 ③多使用空调调节温度
7.实验题- (共1题)
-
【1】题量占比
推断题:(1道)
科学探究题:(1道)
计算题:(2道)
单选题:(10道)
选择题:(2道)
填空题:(5道)
实验题:(1道)
-
【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：3
5星难题：0
6星难题：8
7星难题：0
8星难题：6
9星难题：3