\(n_{hh}=\dfrac{13,44}{22,4}=0,6mol\)

\(\overline{M_x}=24.2=48\)

\(\left\{{}\begin{matrix}SO_2:64\\O_2:32\end{matrix}\right.\)       48    = \(\dfrac{16}{16}=1\)

\(\Rightarrow n_{SO_2=}n_{O_2}=0,3mol\)

1. \(m_{hh}=0,3.64+0,3.32=28,8g\)

2. \(\%V_{SO_2}=\dfrac{0,3.22,4}{13,44}.100\%=50\%\)

\(\Rightarrow\%V_{O_2}=50\%\)

3. \(m_{SO_2}=0,3.64=19,2g\)

\(m_{O_2}=0,3.32=9,6g\)

1.He is........ good teacher. A.a     B.the      C.an      D.one

2.Bao is the most.........He spendshis free time doing volunteer work at the local hospital.A.reserved     B.sociable     C.different     D.humorous

3.Mr.Nam called about his stationery order.He said Mrs.Van could....... him at 8 634 082.A.talk    B.speak    C.reach     D.tell

4.Your mother is beautiful.She has.............A.long straight black hair          B.straight long black hair          C.black long straight hair          D.hair long straight black

1. Playing chess after dinner sounds...................... to me.

A. boring B. bored C. boringly D. boredom

2. We may know the land very well, but we know very................. about the oceans.

A. few B. little C. much D. a little

3. I received a letter....................my friend yesterday.

A. from B. by C. on D. at

4. As a child, he............................ his parents.

A. ought obey B. ought obeying C. ought to obey D. ought to obeying

5. She needed..................................these postcards to her friends.

A. to send B. sending C. sent D. sends

6. Hung and his brother............................. at home yesterday.

A. didn't are B. wasn't C. weren't D. not were

7. She talked to her friends.............................her vacation in da lat.

A. about B. on C. with D. for

8. He caused an accident because he was driving too...........................

A. fastly B. fast C. very fast D. much fast

9. Of all the students in my class, Nam is............................

A. tallest B. taller C. tall D. the tallest

10........................... my next birthday.

A. I am 14 on B. I will be 14th C. I will be 14 on D. I am going to be 14 on

becomes, events, live, programs, broadcasts, much

Nowadays, television 1.............becomes................... very popular. Both old and young people enjoy watching it very 2...............much..................... TV programs attract millions of viewers all around the world. In addition to the news, TV stations also broadcast many interesting 3.............programs...................... such as sports, music, cartoons,wildlife, popular science, reports, contests, movies, etc.

At present, people can enjoy a 4............live................. program on TV. Live TV program helps us see events at the same time as they are happening. In our country, we often watch live TV programs of important 5....................events.............. and international football matches.

1 Listening to music is more interesting than watching TV.

=> I prefer...............................listening to music to watching TV.........................................................................

2. It isn't important for you to finish the work today.

=> You don't............................have to finish the work today.........................................................................

3. How much is this dictionary?

=> What .................................the price of this dictionary?.......................................................................?

4. How heavy is the chicken?

=> What............................................is the weight of chicken?...............................................................?

5. Mr. Trung and Mrs. Trung type quickly .

=> Mr. Trung and Mrs. Trung................................ are quick typists..................................................

6. I got to work in half an hour yesterday.

=> It took ..........................me half an hour to get to work yesterday................................................................................

7. My mother doesn't like coffee and tea.

=> My mother likes neither................................coffee nor tea....................................................

8. You shouldn't eat too much candy.

=> You'd..............................not eat too much candy.............................................................................

1. In a game of singles, two players play ___against____ each other.

2. I’m not very fond ____of____ detective stories.

3. Margarine is different ___from____ butter.

4. His parents are very strict __with ____ him.

5. Many people take part ___in____ jogging every morning.

6. We’d like a walk instead ____of___ riding a bike.

7. Ba is very good ___at____ fixing things.

8. They study and listen to music ___at___ the same time.

9. ___in__ literature, we learn about books and write essays.

10. Will you be home ____for___ dinner tonight?

\(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\)

\(CO_2+Na\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

b. \(n_{MgCO_3}=\dfrac{21}{84}=0,25mol\) \(\Rightarrow n_{HCl}=2.0,25=0,5mol\)

\(V_{ddHCl}=\dfrac{0,5}{2}=0,25l\)

c. \(n_{CO_2}=n_{MgCO_3}=0,25mol\)

\(n_{CaCO_3}=n_{CO_2}=0,25mol\)

\(\Rightarrow m_{CaCO_3}=0,25.100=25g\)

VI. Đọc đoạn văn sau và trả lời câu hỏi. (1,25 điểm)

         With the development of science and technology, more and more energy is used every day. Nowadays, many rural areas in Vietnam have been electrified, and more electricity is needed. If people waste energy, it will quickly run out. Students at school should learn how to save energy, for example, they should turn off electric lights when they leave their classrooms.

        Moreover, we may waste electricity at home if we use a lot of light bulbs. By not wasting energy, we will save a lot of natural resources such as coal and oil.

1. Why is more energy used every day?

___________________________because the development of science and technology_____________________________________________________

2. What is more needed when many rural areas have been electrified?

________________________more electricity is needed________________________________________________________

3. What problem occurs if people waste energy?

__________________________If people waste energy, electricity will quickly run out______________________________________________________

4. What should students do, according to the passage, to save energy?

__________________________should learn how to save energy, for example, they should turn off electric lights when they leave their classrooms______________________________________________________

5. What sort of natural resources will be saved if we do not waste energy?

________________________we will save a lot of natural resources such as coal and oil________________________________________________________

VII. Hãy viết lại những câu dưới đây bằng các từ gợi ý sao cho câu viết lại có nghĩa không đổi so với câu cho trước (1,25 điểm)

1. Lan said, “why don’t you ask the teacher to explain the question again?”

- Lan asked me…………………………why i didn't ask the teacher to explain the question again…………………………………………………………..

2. He started study English four years ago.

- He has……………………………studied english for 4 years…………………………………………………………………

3. They will finish their work tomorrow.

- Their work…………………………will be finished tomorrow……………………………………………………………..

4. It’s a pity. I can’t play the piano.

- I wish ……………………………i could play the piano………………………………………………………………..

5. Your bike is more expensive than mine.

- My bike isn’t…………………………………as expensive as your bike……………………………………………….….

6. We feel very_________today. A. happiness B. happy C. happily D. are happy 

7. The government should do something to help_________. A. the poors B. the poor ones C. poor D. the poor 

8. When I looked round the door, the baby_________quietly. A. is sleeping B. was sleeping C. slept D. were sleeping 

9. Do you feel like_________to the cinema or would you rather_________TV at home? A. going-watching B. going-watch C. go-watch D. go-watched 

10. The policeman warned us_________there. A. not to go B. to not go C. not to going D. not go 

11. This food is the worst I_________tasted. A. had never B. have ever C. did D. had 

12. London_________an underground train system since the nineteeth century. A. has B. had C. have had D. has had 

13. I haven’t written any letters home since I _________here. A. came B. come C. coming D. comes 

14. It’s time we went. If we don’t leave now, we _________the last train. A. miss B. will miss C. would miss D. missed 

15. It is impossible for me _________in all this noise. A. work B. to work C. working D. worked 

16. They asked me a lot of questions, most of _________I couldn’t answer well. A. whom B. whose C. which D. that 

17. They explained _________him how they should operate the machine. A. to B. with C. for D. about 

18. We didn’t like the club _________the poor quality of his service. A. so B. however C. because of D. because 

19. I am angry because you didn’t tell me the truth. I don’t like_________. A. being deceived B. to be deceive C. be deceived D. being deceiving 

20. I have already finished all my work, so I don’t have _________tonight. I think I will read for a while. A. study B. to study C. studying D. studied  

I. Choose the best option A,B,C or D to complete the sentence

1 I wish I ______ people with the same interests

A.meet B.can meet C. could meet D.will meet

2. My mother says she used to _____ a diary when she was young.

A.keep B.use C.write D.preserve

3 The ______ between generations seems to be bigger and bigger than ever

A.blank B.space C.gap D.distance

4. Our teacher's is that we set up a project on preservation of our traditional games

A.offer B.suggestion C,scheme D.order

5 I found the letter in my bag. -I _____ to post it

A.forgot B.would forget C. was forgetting D. forgotten 

6. Does he tell you how he is getting _____ his new colleagues?

A.on with B.on of C.away with D.out of

7 Unfortunately the new system didn't _____our expectations

A. catch up with B. bring about C.come across D.come up to

8. The doctors say it'll take him a long to get _____ the shock

A.past B.above C.through D.over

9. I wish you ____ stop interrupting me whenever I speak.

A.will B.would C.could D.might

10. The policeman is happy ______ the kids safe and sound now.

A.finding B.be found C.to find D.have found

11. _______ she is young, she is very independent

A.Although B.because C.in order that D. in spite of

12. _______ he had finished his studies, he went to America

A.while B.before C.after D.until