1.单选题- (共22题)
2H2O表示的意义，说法错误的是A. 氢气和氧气在点燃的条件下生成水
B. 在点燃条件下，2份质量的氢气和1份质量的氧气反应生成2份质量的水
C. 在点燃条件下，每4份质量的氢气和32份质量的氧气反应生成36份质量的水
D. 每2个氢气分子和1个氧气分子反应生成2个水分子
A. +2 B. +3 C. +4 D. +6
A．mA＜mB B．mA＞mB C．mA=mB D．mA≥mB
| A．降温到10℃有A晶体析出 |
| B．蒸发掉10克水，有A晶体析出 |
| C．加热到30℃时，再加A物质能继续溶解 |
| D．20℃时，向上述溶液中加入少量A晶体，溶液质量不变 |
2.选择题- (共2题)
B
In your life, there are a lot of people around you. They are your relatives, neighbors, friends or classmates. Sometimes you get along well with them, but sometimes don't. What can you do when someone hurts you? Most people may be angry or even fight with him. But it's not a good idea. You'd better forget all this and forgive (宽恕) him.
Maybe it's not easy for you to do that, but it's possible. Please remember: Keep a good mood, and you will keep healthy. Staying angry with others, in fact, means letting others' mistakes treat yourself unfairly.
How can you forgive others?
First, think of something pleasant and try to get yourself happy.
Second, don't wait others to say sorry to you. If anyone hurts you, he won't say sorry to you. He may just want to hurt you or just don't see things the same way.
Third, try to see things in others' shoes. You can understand their minds better and make yourself a little happier.
At last, try to know yourself very well. Whose mistakes caused that, yours or others'? If it's your fault (错误), try to say sorry to them. If it isn't, smile at the thing.
B
In your life, there are a lot of people around you. They are your relatives, neighbors, friends or classmates. Sometimes you get along well with them, but sometimes don't. What can you do when someone hurts you? Most people may be angry or even fight with him. But it's not a good idea. You'd better forget all this and forgive (宽恕) him.
Maybe it's not easy for you to do that, but it's possible. Please remember: Keep a good mood, and you will keep healthy. Staying angry with others, in fact, means letting others' mistakes treat yourself unfairly.
How can you forgive others?
First, think of something pleasant and try to get yourself happy.
Second, don't wait others to say sorry to you. If anyone hurts you, he won't say sorry to you. He may just want to hurt you or just don't see things the same way.
Third, try to see things in others' shoes. You can understand their minds better and make yourself a little happier.
At last, try to know yourself very well. Whose mistakes caused that, yours or others'? If it's your fault (错误), try to say sorry to them. If it isn't, smile at the thing.
3.填空题- (共5题)
（1）从图中你可得到：同一元素的化合价在反应前后的变化规律是 ．
（2）已知浓硫酸与铜在加热条件下可发生化学反应．甲、乙两同学对该反应的生成物有不同观点．甲同学认为生成物为CuSO4和H2O，乙同学认为生成物为CuSO4、SO2和H2O．请结合信息书写出你认为正确的反应方程式 ，被还原的物质是 ．
Mg原子在化学反应中容易 （填“得到”或“失去”）2个电子．
（1）1869年，科学家 发现了元素周期律和元素周期表．
（2）请画出17号元素原子结构示意图 ，该元素在化学反应中比较容易 （填“得到”或“失去”）电子变成离子．
（3）上表中最活泼的金属元素与地壳中含量最多的元素组成的化合物是 （填化学式）．
（1）“SO42﹣”中数字“2”的含义是 ．
（2）该矿泉水显 性（填“酸”、“碱”或“中”）．
（3）日常生活中用 区别软水和硬水，可通过 方法降低水的硬度．
| 温度/℃ | 0 | 20 | 40 | 60 | 80 |
| 溶解度/g | 13.3 | 31.6 | 63.9 | 110 | 169 |
（2）20℃时，向100g水中加入31.6g硝酸钾，充分溶解后得到 （填“饱和”或“不饱和”）溶液．
（3）20℃时，向100g水中加入40g硝酸钾，若使硝酸钾完全溶解，可以采用的方法是 ．
（4）某标签上标有“16%的硝酸钾溶液”，由该标签可获得的信息是 、 ．
（5）右图是同学们根据所学知识设计的一个趣味实验，请参与实验并回答问题：将分液漏斗里适量的水加入大试管中，使足够量的氢氧化钠固体完全溶解后，能观察到的现象是 ；现象的主要原因是 ．
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【1】题量占比
单选题:(22道)
选择题:(2道)
填空题:(5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：1
5星难题：0
6星难题：18
7星难题：0
8星难题：7
9星难题：1