2017临沂中考政策

2018-01-11   来源:英语试题

2017中考动词应用
篇一:2017临沂中考政策

中考英语——动词应用

考情分析

一、动词应用题的命题特点

动词应用题是中考英语试题中的一种传统题型,常以动词填空题出现在中考试题中,主要用来测试考生对动词和非谓语动词形式的掌握情况。这里的“动词填空”不仅仅指谓语动词的正确时态,还包括动词不定式、动名词和分词等形式,而且涉及主动语态和被动语态及主谓一致等知识。因此,掌握好动词的各种形式及其用法是做好此类题的关键。

二、动词应用题的解题技巧

选用动词的适当形式填空主要是测试考生对动词的时态、语态、非谓语动词的用法和其他方面的掌握情况。谓语动词有时态、语态的区别;非谓语动词包括不定式、动名词和分词(现在分词和过去分词)。因此,做此类试题首先要判断是谓语动词还是非谓语动词,然后确定其正确形式。下面从四个方面将确定动词的时态、语态、非谓语动词等形式的方法分述如下:

1. 确定时态的方法

(1)根据句中所含的时间状语来判断时态

①一般现在时常用的时间状语有sometimes,often,always,usually,every Tuesday,in the morning等。 ②一般过去时通常与表示过去的时间状语连用:last year,yesterday,... ago,last Monday morning,just now等。

③一般将来时常有表示将来含义的时间状语:tomorrow,next week,this evening等。 ④现在进行时常与now连用,或用look,listen创设现在进行时的语言环境。

⑤过去进行时常与表示“具体的过去时间”连用。如:at eight last night,at that time,at this time yesterday等。

⑥现在完成时常用的时间状语有already,just,ever,never,yet以及since/for引导的时间状语。 ⑦过去完成时常与表示“与过去时间比较已经完成”,含有“过去的过去”之意的时间状语连用。如:by the end of last year,by 1990等。

⑧过去将来时常出现在主句为一般过去时的宾语从句里,且常与表示“过去将来”的时间状语连用,如the next week/month等。

(2)①根据上下文和时态呼应来判断时态。如:Listen! Who is singing?

②在复合句中,可根据从句的时态判断主句的时态。如:He has been to many places since he came to China. 也可根据主句的时态判断从句的时态。如宾语从句中若主句是一般过去时,宾语从句常用过去的某种时态。如:Bill asked if he could come.

③当主句为一般将来时,从句为if,when,as soon as,until等引导的状语从句时,从句常用一般现在时表示将来。如:If you don’t hurry,you’ll miss the train.

(3)根据习惯表达来判断时态。如:表示客观真理的宾语从句常用一般现在时。如:He said the earth goes round the sun.

2. 确定语态的方法

当句子主语是动作的承受者,含有“被动”之意时,要用被动语态。被动语态的谓语由“be+及物动词的过去分词”构成。be要随着时态和主语的人称和数而变化。中考所涉及的被动语态只有一般现在时、一般过去时和含有情态动词的句子的被动语态。只要熟练掌握,一般没有什么困难。

3. 确定非谓语动词的方法

对于动词不定式,主要掌握其基本用法,对于动名词和分词,主要掌握教材中出现的常用搭配,并把这些动词分清、记牢。记住这些动词,就等于记住了它们的用法。

①跟动词不定式作宾语的动词有want,try,forget,hope,decide,choose,agree等。 ②跟动名词作宾语的动词有keep,finish,enjoy等。

③stop,remember,forget等动词既可跟不定式也可跟动名词作宾语,但意义不同。如:

He stopped talking.

He was so tired that he stopped to have a rest.

④动词let,see,hear,make,feel等后面的宾补在主动语态中常用不带to的不定式,但变为被动语态时,则要带to。如:

They made him work 10 hours a day.

He was made to work 10 hours a day.

4. 其他方面

包括习惯用法、句型、短语等。如一些常见句型:It takes sb. some time to do sth. ;too... to do sth. 等。介词后面应用动词-ing形式。系动词、实义动词在情态动词、助动词后面用原形。此外,还应注意一些常见的短语,如:well done,had better do sth. 等。这些方面的知识主要靠平时积累,并且多做有关练习,加以巩固记忆,只有这样才能熟练掌握。

例如:(2016·山东临沂中考动词应用)

根据短文内容,用括号内所给动词的适当形式填空,必要时可加助动词或情态动词。

A special red bridge was found in the Lake District,Britain. The whole bridge used no glue or bolts (螺钉). It was completely made of paper!

The bridge was a piece of art work. It _____1 (start) to open to the public in April,2015. The bridge was made of 22,000 pieces of paper and it (be) five meters long.

The bridge became a popular tourist place. The tourists wanted to test whether it would hold their weight. “The red bridge really 3 _____ (stand) out in the wild countryside and makes you _____4 (want) to touch it or even walk over it,” said a visitor.

The special paper bridge was an art project by an environmental artist named Steve Messam. To build the paper bridge was not easy at all,and he spent three years (develop) the bridge. He used old principles(原理) from Roman times (build) it. He said the 4. 5 tons of paper made the bridge much stronger than oak(橡木). Even after heavy rain,the bridge wasn’t influenced at all.

The paper _____7 (produce) by a paper factory. After the exhibition (展览),all the paper was recycled.

Test 1

A(2015·山东临沂)

根据短文内容,用括号内所给动词的适当形式填空,必要时可加助动词或情态动词。

Bridges are built for many reasons. Some bridges are built so that cars _____1 (cross)over rivers. Others are made for trains to use. In Washington State,there is a very unusual bridge. It was built for squirrels(松鼠).

The town of Longview has a very busy street. Many cars pass it every day. When squirrels tried to cross the street,they 2 _____ (kill). Amos Peters wanted _____3 (protect)these small and lovely animals,so he built a bridge for them—one that would let them pass above the traffic.

The bridge 4 _____ (be)a symbol of the town for over 40 years since then. And every Christmas,the local people (add) a small Christmas tree to the center of the bridge. How lovely!

A few years ago,the local people 6 _____ (create)a squirrel festival and they raised money _____ (build)two more bridges for these lovely animals. For years,because of the bridges,the squirrels in the town have been able to cross safely from one side of the street to the other.

B(2016·山东滨州)

根据短文内容,用括号内所给动词的适当形式填空,必要时可加助动词或情态动词。

One day,I took my daughter to the park. As soon as we got there,my daughter _____1 (run) to the swing (秋千) and asked for a push. When I was helping my daughter,I noticed another girl trying to make her

own swing (go) high by herself. Her old grandmother was sitting on the chair nearby and smiling at us. Gradually,my daughter (push) higher and higher by me. Then I walked towards the little girl. I asked if I (give) a big push to her. She smiled and said “Yes”. For the next hour,I pushed the swings,and played with my daughter and the little girl. When we went home,I (be) tired but very happy.

One day two years later,after a day’s work,I went to pick up my daughter before going home. While I (wait) outside the school gate,a little girl smiled sweetly at me and gave me a big hug. As I watched her (run) away,I realized that she was the girl whom I gave a big push in the park.

So far,I _____8 (not forget) her sweet smile and the warm hug that she gave me. In fact,if we give love to others,love (find) its way back to us. It may travel from heart to heart or it may blossom (开花) in the heart. The love we share,the kindness we (give),and the happiness we create will come back to us with a pleasant surprise.

A(2016·山东威海)

用括号里所给动词的适当形式填空。

When I was a child,my parents often took me to a run-down house in a thick forest. No other children ever stayed there. I didn’t even have the choice of playing with a brother or sister.

I could never _____1 (understand) what the attraction of the house was,even for my parents,who enjoyed nothing better than to sit in silence with a good book. The woman in the house,my father’s distant cousin,was a terrible cook.

One day,when I was hanging around the garden behind the house,I noticed a wooden house. It was clearly abandoned(废弃的)and (hide) completely behind tall trees and huge grass.

As I walked towards it,I heard a noise,like an animal moving hurriedly away. I was about to turn away when I saw an old man(stand) at the door. I was much scared. “Please don’t tell them you saw me,” he said. “They never use this place,and I have nowhere else to live. ” “Don’t worry,” I said. “I (not tell) anyone. But are you all right out here? I mean do you have enough to eat? ”

The old man _____5 (shake) his head and said that he hadn’t had a big meal for ages. I decided to put this right as soon as I could. The same evening,I took a small plastic bag into the dining room and,while no one was looking,I emptied some of the food into it. Later,I got out of the back door secretly and gave the food to the old man,whose name I had discovered was Taff. I had never seen anything else as lovely as the smile on Taff’s face when he (eat) the food. From then on,my visits to the old house had a purpose,and I enjoyed every minute of the rest of my stay.

B(2016·山东东营)

阅读下面短文,用括号内所给动词的适当形式填空,必要时可加助动词或情态动词。

Bullying (欺凌) is doing things to hurt other people. It is a serious problem at school.

Miah—now a 22-year-old girl,still _____1 (remember) how she was bullied in junior high school. “They kicked me,put sticks in my hair and took money from me. Even worse,I _____2 (make) to eat rubbish. I never(forget) those moments. ”

Miah is not the only case. I saw another bullying situation when I was a student. Some students bullied a handicapped (智力低下的) girl every day—hitting,pushing,and kicking her. They just enjoyed(do) it. The girl didn’t realize that people ’t even tell the teacher. The situation lasted for a long time.

Bullying at school is getting worse,so,many people _____6 (try) to start anti-bullying (反欺凌) programs. Students in many schools have already taken action. Theyanti-bullying clubs. Many students have joined the clubs. They work with teachers to show students how to stop bullying. Some other programs have proved to be successful,too.

In Wales,two girls came up with an idea to stop bullying on the school bus. They created a bus pass (乘车证)

and made four rules for students:no bullying,no swearing (骂脏话),no smoking and no shouting. Whenever a student broke a rule,he would get a mark on his pass. When a student had four marks,he wouldn’t be allowed to take the bus anymore. The bus pass idea worked. It

In Michigan,some students tried to stop bullying with friendship. They made DVDs. They gave the DVDs to students in their school (teach) them how to be good friends. This idea worked,too. After that,there was less bullying at their school.

School programs like these _____10 (help) bullies learn to behave properly and they can also help prevent school bullying. I think it will come to a stop if everyone does some things.

3.语法填空

Dear Jenny,

How’s it going? Are you busy 1____________ your study these days?

I’ve been back at school for nearly four weeks. I’m very glad to tell you that great 2.____________ (change) have taken place in our school this term. First of all, we’re asked to “clear our plates” when having our meals and say no to wasting. Some of us used to order 3.____________ (much) than what we could eat. That was a big waste of food. Now we need to finish the food we order. We should also stop 4.____________ (waste) in some other ways. For example, we should turn off the lights when we leave the classroom. And our school has opened up some fields for us to learn how to grow vegetables. Each class is 5.____________ (give) a small garden and our class has decided to grow some tomatoes and beans( 豆类) in our 6._____________ (freely) time. I think that’ll be very interesting. Maybe I’ll be able 7.____________ (post) you some beans we’ve grown by ourselves next time! What’s more, we have only two classes in the afternoon 8._____________ we have more time for after-school activities. I’m one of the traffic safety volunteers in our school. After school, we take turns to go to the streets near our school and ask people to 9._____________ (following) the traffic rules.

I think we are having a different school life now!

Please write back soon and tell 10.____________ (I) more about your school.

Yours,

Wang wei

4.语法填空 Light travels at _1_____________ speed which is about a million_2___________( time) faster than the speed of sound. In one second, light travels about 300,000km, _3_____________ sound travels only 344m. You can get some idea of this difference by_4________________( watch) the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays(光线)left the moon 1.3 seconds before they reached you. The_5___________( near) star is so far away that the light which you can see from it tonight started to travel towards you four years ago _6________________ a speed of nearly 2 million km per minute. In some cases the light from one of tonight’s stars started on 7____________ (it ) journey to you before you were born. Thus, if we want to be _8__________(honest), we cannot say “ The stars are _9___________(shine) tonight.” We have to say, “ The stars look pretty. They were shining four years ago but their light has only just__10_____________( reach) Earth.”

2017临沂中考化学初中人教版模拟题
篇二:2017临沂中考政策

第九单元 溶液

临沂中考题

1.天热的时候把半杯糖水(蔗糖已全部溶解)放进冰箱的冷藏室,过一段时间后发现杯底出现了部分蔗糖晶体。对于这一现象的认识不正确的是( ) A.未放入冰箱前的糖水一定是饱和溶液 B.降低温度可从糖水中获得蔗糖晶体

C.放入冰箱前糖水中蔗糖的质量分数比放入冰箱后大 D.温度降低后蔗糖的溶解度随之变小

2.小明在做家庭小实验时,把下列物质分别放入适量水中并充分搅拌,其中不能得到溶液的是( )A.面粉 B.纯碱 C.食盐 D.白酒 3.如图是X、Y两种固体物质的溶解度曲线, 下列说法中错误的是( )

A.X、Y两种物质的溶解度都随温度升高而增大 B.X物质的溶解度大于Y物质的溶解度

C.降低温度可使接近饱和的X溶液变为饱和溶液 D.t℃时,X物质的溶解度等于Y物质的溶解度

4.将下列物质分别放入水中,能形成溶液的是( ) A 花生油 B 泥土C 汽油 D 蔗糖

5.将家庭生活中的四种调味品分别取少量放入水中,不能形成溶液的是( ) A、蔗糖 B、白醋 C、味精 D、花生油

6.分类是化学学习、研究的重要方法。下列物质中,属于混合物的是( ) A.氯酸钾 B.石灰水 C.二氧化碳 D.氢氧化钠 7.用化学符号或者化学式填写:

(1)食盐水中的溶质 (2)胃酸的主要成分 (3)医疗上常用它来配制生理盐水,日常生活中又可用来调味,它是 8.化学发展对农业生产起着重要作用。 (1)钾肥能提高农作物抗倒伏、抗病虫害的能力。下列化肥中属于钾肥的是 (填序号)。 ①碳酸氢铵(NH4HCO3) ②硫酸钾(K2SO4) ③磷矿粉【有效成Ca3(PO4)2】 ④硝酸铵(NH4NO3)

(2)在农业生产上,常用质量分数为15%~20%的氯化钠溶液来选种。要配制200kg质量分数为16%的氯化钠溶液,需要氯化钠的质量是 kg,水的质量是

9.右图是a、b两种固体物质的溶解度曲线。 (1)从图中你能获得的信息是(答出两条即可)

______________________________________________;

(2)40℃时,a物质的饱和溶液中溶质和溶剂的质量比是________

10.右图为甲、乙两种固体物质的溶解度曲线,请回答:

1)t1℃时,甲、乙两种固体物质的溶解度大小关系为

甲 乙(填“>”“<”“=”)。

(2)

t1℃时,把50g甲物质放入100g水中,充分搅拌,所得

溶液是 溶液(填“饱和”或“不饱和”),将温度升高到 t2℃时,该溶液中溶质和溶剂的质量比是 。

(3)t2℃时,有一接近饱和的甲溶液,可采用 的方法(任写一种)使其变为饱和溶液。 11.A、B、C三个烧杯中盛有相同质量的水(其中A、C烧杯中水温为10℃,B烧杯中水温为30℃,不考虑溶解过程中温度的变化),分别加入甲、乙两物质各10g,充分溶解后所得现象如下图所示,试回答: A B C

⑴ 你认为_______烧杯中的溶液可能是不饱和溶液。

⑵ 上右图是甲、乙两种物质的溶解度曲线图,按图分析,10℃时A烧杯和C烧杯中未溶解的溶质质量关系是________(填“相等”或“不相等”)。其它条件不变,将C烧杯中的温度升到50℃时,C烧杯中的溶液是___________(填“饱和”或“不饱和”)溶液。 ⑶ 若将A烧杯中的溶质全部溶解,可采用的方法有:

① ________________________;②12..已知氯化钠、碳酸钠在不同温度时的溶解度如下:

⑴ 依据上表,绘制了氯化钠和碳酸钠的溶解度曲线(如上图),图中能表示碳酸钠溶解度曲线的是___________(填“A”或“B”);

⑵ 图中两溶解度曲线相交于M点,此点表示的意义是____________________________;

⑶ 40℃时,把50gA物质放入100g水中,充分搅拌,所得溶液是__________溶液(填“饱和”或“不饱和”);

⑷ 生活在盐湖(湖水中有溶解较多的氯化钠和碳酸钠)附近的人们习惯“夏天晒盐(NaCl),冬天捞碱(Na2CO3)”。请你答出“冬天捞碱”的道理________________________________。

达标检测题

1.溶液是自然界中常见的物质。下列有关溶液的说法正确的是 A.溶液一定是均一、稳定、无色、透明的液体 B.溶液蒸干后,均能得到固体溶质

C.某物质的饱和溶液就是不能再溶解任何物质的溶液

D.物质在溶解时,常常会使溶液的温度发生改变 2.判断某瓶KNO3溶液是否饱和的正确做法是( ) A.取样,加入少量KCl固体,观察是否继续溶解 B. 取样,加入少量KNO3固体,观察是否继续溶解 C. 取样,使其温度降低,观察是否有晶体析出 D. 取样,使其温度升高,观察是否有晶体析出 3.下列说法正确的是( )

A.溶液都是均一、稳定的无色的液体 B.饱和溶液一定比不饱和溶液

C.配制溶液时玻璃棒搅拌能增大固体物质的溶解度

D.一定温度下,判定某溶液是否饱和的方法是加入该溶质看溶质是否继续溶 4写出下列溶液中溶质的化学式:

①澄清石灰水 ②0.9%的食盐水溶液(俗称生理盐水) ③白酒 ④稀盐酸 ⑤硫酸铜溶液

⑥医疗消毒用高锰酸钾溶液 5.右图为甲、乙、丙三种固体物质在水中的溶解度曲线 (1)在t1的顺序是____________________;

(2)在t2℃时,把40g的乙物质加入到100g的水中, 充分搅拌后所得乙溶液为____________(填“饱和溶液” 或“不饱和溶液”),其溶质和溶剂的质量比为(结果化简到最简整数比)

(3)将t1℃时甲、乙、丙三种物质的饱和溶液均升温到t2℃,此时溶液仍为饱和溶液的是 6.右图是A、B两种固体物质的溶解度曲线,请回答: (1)t2℃时,A、B溶解度的大小关系为A______B。 (2)t3℃时,把固体A、B各45g分别放入100g水中,

充分溶解后可得到饱和溶液的是________,A

B液质量为

将它们分别降温到t2℃,此时两种溶液的溶质质量分数 的大小关系为A________B。

(3)A溶液中混有少量B溶液时,可用__________法提纯A。

7.如图为甲、乙、丙三种不含结晶水的固体物质溶解度曲线,据图回答:

①图中 物质的溶解度曲线与气体物质溶解度曲线受温度影响变化相似。 ②t1℃时,125g甲物质的饱和溶液中,含甲物质 g。

③t3℃时,取等质量甲、乙、丙三种物质分别配制成饱和溶液,所得溶液质量最小的是 物质。 ④现有甲、乙、丙三种物质的浓溶液,可用海水晒盐原理进行结晶提纯的是 物质。 8.右图是A、B两种物质的溶解度曲线,根据图示回答下列问题:

(1)t1℃时,向两只盛有100g水的烧杯中,分别加入A、B两种物质至不能溶解为止,所得溶液的溶质质量分数较大的 是___________溶液(填“A”或“B””)。

(2)将t2℃的A、B两种物质的饱和溶液各200g,降温至t1℃,析出晶体的质量关系是A______B。

(3)将t2℃的A、B两种物质的饱和溶液升温至t3℃,欲使它们仍为饱和溶液,可采取的方法有 。(答一条即可)

9.实验室配制50g质量分数为6%的氯化钠溶液,需要氯化钠质量为,水的质量

10.化学实验室里现有质量分数为98%的浓硫酸,但在实验室中常需要较稀的硫酸。要把100g上述浓硫酸稀释为20%的硫酸,需要水的质量是多少?

第八单元 金属和金属材料

1.相等质量的金属Zn、Fe分别与足量的稀盐酸反应生成氢气的质量与金属的相对原子质量

成 比,因为Zn—65 ,Fe—56 所以它们生成氢气质量由多到少的顺序是

如右图所示甲表示 乙表示 (填锌或铁)

2配制波尔多液(硫酸铜溶液)为什么不能用铁桶盛放原因是(写

化学方程式)

3. 市场上出售的补血麦片中常含有微量铁粉,它与胃液中的盐

酸反应后,起到补血的作用,反应化学方程式

4向含有AgNO3、Cu(NO3)2和Mg(NO3)2的混合溶液中加入一定

2017临沂中考政策。

量的铁粉,充分反应后过滤,向滤渣中加入稀盐酸,发现有气体

生成,回答:(1)滤渣中的物质有 ,滤液中的溶质

(2)写出铁粉与硝酸银溶液反应的化学方程式

二.临沂中考题

1.在CuO和Fe的混合物中,加入一定量的稀H2SO4并微热。当反应停止后,滤出不溶物,再向

滤液中放入一粗铁丝,片刻后取出铁丝,发现粗铁丝无任何变化。据此,你认为下列结论正确的

是(提示CuO+H2SO4=CuSO4+H2O)(B)

A.不溶物一定是铜

B.不溶物中一定含有铜,也可能含有铁

C.滤液中一定含有H2SO4,也可能含有CuSO4

D.滤液中一定含有FeSO4,也可能含有CuSO4 和H2SO4

2.质量相同的下列金属,分别加入到足量的稀盐酸中充分反应,放出氢气最多的是

A.Mg B.Al C.Cu D.Zn

3.将X、Y、Z三种金属,如果把X、Y和Z分别投入到稀盐酸中,只有Y溶解并产生气泡,X、Z

不反应;如果把X和Z分别放入硝酸银溶液中,过一会儿,在X表面有银析出,而Z没有变化。

则X、Y、Z的金属活动性顺序为( )

A.Y>X>Z B.X>Y>Z C.Z>Y>X D.X>Z>Y

4.下列分析判断正确的是( ) A 酸能够使紫色石蕊溶液变红,二氧化碳能使紫色石蕊溶液变红色,所以二氧化碳是酸

B 铁、铜都是金属单质,都能够置换出盐酸、稀硫酸中的氢 C 氧化物中含有氧元素,但是含有氧元素的化合物不一定是氧化物 D 点燃的木条伸入某无色气体中会熄灭,证明该无色气体一定是二氧化碳。 5.小明设计实验探究铁、铜、银三种金属的活动性顺序。他设计了四个实验方案,分别选择的试

剂是:①铜、银、硫酸亚铁溶液;② 铁、银、硫酸铜溶液 ;③银、硫酸亚铁溶液、硫酸铜溶液 ;2017临沂中考政策。

④铜、硫酸亚铁溶液、硝酸银溶液 。上述四个方案所选试剂正确的是: ( )A、○

2○4 B、○1○2○3 C、○1○2○3○4 D、○2○3 6.若金属锰在金属活动性顺序中位于铝和锌之间,则下列反应不能发生的是( )

【提示:MnSO4溶于水】

A.Mn+2HCl = MnCl2+H2↑ B.Fe + MnSO4 =FeSO4 + Mn

C.2Al+ 3MnSO4 =Al2(SO4)3 + 3Mn D.Mg + MnSO4 =MgSO4 + Mn 7.生铁和足量的稀盐酸充分反应后,总会有残渣剩余,残渣的主要成分是( ) A铁 .B氯化铁 .C.氯化亚铁 D.碳 8.在实验室里探究铁,铜的金属活动性顺序,除铁、铜外,还需要一种试剂,你选择的试剂是 ,写出有关反应的化学方程式 9.生铁和钢在组成上的主要区别是________________不同;在研究“铁生锈的条件”实验中得出,铁生锈实际上是铁与空气中 、水蒸气等发生化学反应的结果;铁制品生锈后可使用稀盐酸将其表面的铁锈除去,该反应的化学方程式是_______________________________。 10.相同质量的M、N两种活泼金属,分别与足量的稀盐酸在室温下发生反应(M、N在生成物

中的化合价为均为+2价),生成H2的质量m和反应时间t的关系如右下图所示。

(1)金属活动顺序是M比 (填“强”或“弱”);相对原的相对原子质量是M比

N的)。

11.已知,A、B、C、D四种物质之间存在以下转化关系。其中

C是单质,D是相对分子质量最小的氧化物。试回答

(1)

写出A、C、D三种物质的化学式:A________、C_________、D_________。

浅绿色溶液B中溶质的化学式_______________。

(2)写出C→D的化学方程式_________________________________。

12.小明为探究Cu、Al、Ag的金属活动性顺序,做了以下两个实验。请分析实验,完成填空。

铝丝 铜丝

CuSO4 AgNO3 溶液 溶液

① ② (1

)试管①中观察到的现象是:铝丝表面附着一层

固体,溶液颜色变浅 ( ( 2 )试管②中发生了化学反应,现象明显。该反应的化学方程式是 3 )通过实验探究,

Cu、Al、Ag三种金属活动性由强到弱的顺序是 。

13.沂蒙汽车配件厂新购进了一批黄铜(铜锌合金)。为了测定这批黄铜中铜的质量分数,化验人员将取来的样品先加工成粉末,然后利用该粉末与稀硫酸在烧杯内发生反应。在所进行的三次实验中,只有一次所取用的稀硫酸与黄铜样品是恰好完全反应的。有关实验数据记录如下:

(1)黄铜样品与稀硫酸恰好完全反应时两种物质的质量之比为________________,该黄铜样品中铜的质量分数为_____________________。

(2)计算黄铜样品与稀硫酸恰好完全反应后所得的溶液中溶质的质量分数。(计算结果精确到0.1%)

14..黄铜是铜和锌的合金(Cu—Zn)为了测定黄铜样品中锌的质量分数,现将80g稀硫酸平均分成4份,分别与一定质量分数的黄铜样品进行实验,每次充分反应后,测定生成氢气的质量数据

计算:(1)哪几次稀硫酸有剩余? (2)M的值 (3)铜铁合金中铁的质量分数为 (4)稀硫酸溶质的质量分数? Cu—64 Fe—56 H—1 S—32 O—16

(1) 从第几次实验开始黄铜样品有剩余? (2)M值 (3)黄铜样品中锌的质量分数? Zn—65 H—1

15. 某课外活动小组为测定铜铁合金中铁的质量分数,现取Cu

、Fe合金样品20g,将80 g稀盐酸平均分成4份,分4次逐渐加入到样品中,充分反应后测得剩余固体质量如下表:

2017临沂市中考英语复习语法考点精讲+真题精炼:数词
篇三:2017临沂中考政策

考点一 基数词的构成

表示数目多少的数词叫基数词。它的构成方式如下:

(2)13—19都以-teen结尾,单词中的两个音节都重读。

22 twenty-two 35 thirty-five

(5)101—999之间的非整百的基数词:百位数和十位数(或个位数)之间用and连接。如: 156 one hundred and fifty-six

709 seven hundred and nine

(6)四位数或四位数以上的基数词的拼写规律为:从右向左每三位加一个逗号,第一个逗号前用thousand,第二个逗号前用million,第三个逗号前用billion;读数时从左向右依次读出来。如:

3,895 three thousand,eight hundred and ninety-five

17,825,437,108 seventeen billion,eight hundred and twenty-five million,four hundred and thirty-seven thousand,one hundred and eight

例 The road is over metres long.

2017临沂中考政策

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