1.计算题- (共1题)
| 第一次 | 第二次 | 第三次 |
连续加入盐酸的体积/mL | 10 | 10 | 10 |
生成氢气的质量/g | 0.08 | X | 0.04 |
(1)X=____________;
(2)从上表数据分析,小华用10 g合金粉末总共收集到氢气_______g;
(3)求该合金中铜的质量分数。
2.推断题- (共1题)

回答下列问题:
⑴写出工业制取的两种物质的化学式:B__________,G_________;
⑵写出反应③的化学方程式:____________________。
3.单选题- (共9题)
A.CaCO3粉末 | B.MgCl2溶液 | C.KNO3溶液 | D.石蕊试液 |

A.用等质量、等质量分数的过氧化氢溶液在有无催化剂条件下制氧气 |
B.一定质量的红磷在密闭容器中燃烧 |
C.向等质量、等质量分数的稀硫酸中分别逐渐加入锌粉和铁粉 |
D.向一定质量的氯化铜和稀盐酸的混合溶液中逐滴加入氢氧化钡溶液 |
A.向滤渣中加入稀盐酸,一定有气泡产生 |
B.向滤液中加入稀盐酸,一定有沉淀产生 |
C.滤渣中一定含有Ag,可能含有铜 |
D.滤液中一定含有Cu( NO3)2,一定不含AgNO3,不一定含有Al(NO3)3 |
A.酸性溶液能使紫色石蕊试液变红,所以能使紫色石蕊试液变红的溶液呈酸性 |
B.溶液具有均一、稳定的特征,所以均一、稳定的液体一定是溶液 |
C.单质是由同种元素组成的,同种元素组成的物质都是单质 |
D.复分解反应中有沉淀、气体或水生成,所以有上述物质生成的反应就是复分解反应 |
A.食品往往因为受潮而加速变质,为延长保质期,用熟石灰作食品的干燥剂 |
B.为保持肉制品鲜美,在制作香肠时应多加亚硝酸钠(NaNO2)等防腐剂 |
C.吃松花蛋时,为消除蛋中所含碱性物质的涩味,可加入少量食醋 |
D.冬天室内用煤炉取暖,为防止热量散失,要紧闭门窗 |
A.隔绝了氧气 | B.可以燃烧 |
C.改变了楼板的着火点 | D.清除了可燃物 |
4.选择题- (共2题)
根据短文理解,选择正确答案。
Andy never wanted to go to bed on time. His parents had explained to him how important it was to go to bed early and get a good rest. But Andy paid no attention to them, and they didn't know what to do until one weekend when they were visiting Andy's grandparents.
Grandpa Peter heard all about it and said, "This sounds like a job for Tubby." So Andy's parents loaded the cat onto the car and returned home.
That night, at bedtime, the same problem happened. Andy didn't want to go to bed, and even though his parents waited a while to see if Tubby would solve the problem, nothing happened.
Hours later, Andy finally decided to go to bed. But what a surprise when he entered his bedroom! Tubby was in his bed, totally sprawling out, pot-belly in the air, and snoring like an express train.
Andy tried to move the cat, but there was no way of moving him an inch. That night he hardly slept, lying on one tiny corner of his bed.
The next day the same thing happened, even though Andy was much more tired from not having slept well. When the third day arrived, he had understood that if he wanted to sleep in his bed, he would have to get into it before Tubby did. That night, when his parents only started to mention the topic of bedtime, Andy rushed upstairs and dived into bed. His parents could not believe it. They knew nothing about Tubby in the bed, nor did they understand why Andy went to bed on time without complaint. They were so happy about this that they stayed up quite late, celebrating.
5.填空题- (共6题)

试根据材料回答下列问题:
(1)重铬酸钾(K2Cr2O7)中铬元素的化合价是________;K2Cr2O7分解生成X的化学式为______________;
(2)说出铬单质的一条物理性质___________________________________;
(3)硫酸铬中铬、硫、氧三种元素的质量比为__________________填最简整数比)。
溶液为浅绿色的阳离子 ______ ;3个碳酸根离子 ______ ;4个氨分子 ______ ;五氧化二氮中氮的化合价 ______ ;含氧量最大的氧化物 ______ ;能作为燃料的无机化合物 ______ ;一种碱 ______ .

(1)请写出标有序号的仪器的名称:① ______
(2)采用装置B物制取二氧化碳,反应的化学方程式为________________。
(3)若用G装置采用排空气法收集氧气,氧气应从 ______ (选“a”或“b”)进.
(4)制取二氧化碳最好选用的发生装置是 ______ ,该装置与另一个可选用的装置相比,其主要优点是 ______ .
(1)除去水样中难溶性的固体,需将水样(填序号) ________;
①加热 ②过滤 ③蒸发 ④冷却
(2)在白瓷板上放一小片pH试纸,用玻璃棒蘸取少量(1)中所得到的液体,测得其pH大于7,则说明该水样显________性;
(3)由上述数据分析,该河水的主要污染物可能是(填序号) ________;
①带有酸臭味的城市生活污水 ②化工厂排放的污水
(4)为了保护河水水质,下列做法合理的是(填序号) ________。
①抑制水中所有动、植物的生长 ②不任意排放工业废水
③禁止使用农药和化肥 ④生活污水经过净化处理后再排放

(1)35℃时,这三种物质溶解度由小到大的顺序为______________。
(2)若甲固体中含有少量乙,则提纯甲的方法是_______________。
(3)将25℃时乙的饱和溶液升温到35℃,则其溶液的溶质质量分数___________(填“变大”、“变小”或“不变”)。 25℃时,将25g甲固体加入到50g水中,充分溶解并恢复到原温度后,得到溶液的质量为___________g。
(4)35℃时,分别用等质量的甲、乙、丙配制该温度下的饱和溶液,所得溶液的质量最小的是_________________。

请你根据上述材料,回答下列问题:
(1)操作①的名称是______________(填“溶解”、“过滤”、“蒸发”之一)。
(2)试剂C中溶质的化学式是________________。
(3)从海水中提取MgCl2时,经历了“MgCl2→Mg(OH)2→MgCl2”的转化过程,请分析这样做的目的是___________________________________。
(4)写出②的化学方程式___________________________________,该反应属于_______反应(写出它的基本反应类型)。
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【1】题量占比
计算题:(1道)
推断题:(1道)
单选题:(9道)
选择题:(2道)
填空题:(6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:3
5星难题:0
6星难题:9
7星难题:0
8星难题:4
9星难题:1