Cân bằng các PTHH sau

A. KClO3 -> KCl + O2

B. Na2O + H2O -> NaOH

C. Fe + O2 -> Fe3O4

D. HgO -> Hg + o2

E. O2 + H2 -> H2O

G. KMnO4 -> K2MnO4 + MnO2 + O2

H. SO2 + O2 -> SO3

Mình camon ạ

Lập PTHH của phản ứng

A. Ca (OH)2 + H3PO4 -> Ca3(PO4)2 + H2O

B. Al + H2SO4 -> Al2(SO4)2 + H2

Mình camon

Hãy viết PTHH của các phản ứng hóa hợp của từng cặp chất sau:

- nhôm và oxi tạo thành nhôm oxit

- natri và oxi tạo thành natri oxit

- kali và lưu huynh tạo thành kali sunfua

- đồng và clo tạo thành đồng ( hóa trị 2) clorua

Mình camon ạ

Lập PTHH theo sơ đồ sau:

A. Bari oxit + Nước -> bari hidroxit

B. Magiê oxit + axit cloruahidric -> magiê clorua + Nước

C. Magiê clorua + natri hidroxit -> magiê hidroxit + natri clorua

D. Sắt (hóa trị 3) oxit + axit sunfuric -> sắt (hóa trị 3) sunfat + nước

Mình camon

Lập các PTHH theo sơ đồ sau:

A. Sắt từ oxit + cacbon oxit -> sắt + nhôm oxit

B. Nhôm + sắt ( hóa trị 3) oxit -> sắt + nhôm oxit

C. Photpho + oxit -> điphotpho pentaoxit

Mình camon

Viết PTHH xảy ra :

A. Tôi vôi là phản ứng canxi oxit tác động với nước tạo ra canxi hidroxit ( vôi tôi)

B. Nung nóng kali clorat (KCLO3) thành kali clorua và khí oxi

C. Đốt than trong ko khí tạo thành khí cacbonic

D. Nung nóng đồng hidroxit tạo thành đồng oxit và nước

Hộ mình với ạ

Mình camon

A, canxi cacbonat -> canxi oxit + khí cacbonic

B, canxi clorua + bạc nitrate -> bạc clorua + canxi nitrat

C, natri hiđroxit + sắt (hóa trị 2) sunfat -> natri sunfat + sắt (hóa trị 2) hiđroxit

D, axit sunfuric + bari clorua -> bari sunfat +axit clohiđroxit

E, nhôm hiđroxit -> nhôm oxit + nước

Hộ mình với !minh camon

*make sentences

1. She/ take/subway when she/ go/ town every week.

2. I /prepare/ dinner before my friend /arrive /yesterday evening.

3. We /go/ out /drinks after we/ get / the hotel next Tuesday.

4. Before I/ answer /his question /he /tell /me/ secret.

5. Bob usually /use /bilingual dictionary when he /read /book/German.

6. When he/arrive /next week/ we /play/ round of golf.

7. She /order /hamburger when she /go/ restaurant /me last week.

8. After I /finish /report /I /hand in /homework /teacher tomorrow.

9. When I / child /Tony /speak /very quietly so / his friends often /can not / understand.

10. The group /find /their hotel easy after they /buy /the map /the city.

11. I take /great deal /pride / my children.

12. She /take / pride / her work and it show /her products.

*Rewrite

1. My suit needs to be cleaned before the interview ./I must............

2. He is said to have been in the French Foreign Legion./ people..................

3. The keepers feed the lions at 3p.m every day. / the lions................

4. Turn off all the switches before leaving the workshop. /all the switches must................

5. The police made the youth empty his pockets. / the young...............

6. There are more girls in my class than there are in hers. /her class...............

7. There isn't as much milk in my glass as there is in yours. /there is.................

8. There are fewer theater in a small city than there are in a big one. /there isn't................

9. There is less noise in the country than there is in the city. /there isn't ..................

10. I get to work in half an hour. / It take...................

11. We started living here fifteen years ago. /we have......

12. The last time she visited me was five months ago. /she hasn't.....................

13. I last wrote to my uncle in June. /I haven't..............

14. He went out. He wanted to buy some stamps. /so as.............

15. Minh began to collect stamps in 2000./ Minh has.........

* Choose the best answer

1.''............."are you going to stay here?

~For two weeks

A. How long

B. How often

C. How far

D. How much

2. I'm going to visit my uncle.................. Saturday morning.

A. in

B. on

C. at

D. about

3. What about............... a cup of coffee?

A. Have

B. Having

C. You have

D. Do you have

4. Let's............ the movie

A. Go

B. To go

C. Going

D. Is going

5. What do you do.......... you're free time?

A. At

B. In

C. On

D. To

6. ........... does she go jogging?

Once a week

A. How often

B. How long

C. How about

D. How

7. He.........to go to the movie every week.

A. Goes often

B. Often goes

C. Go often

D. Is often

8. What's the weather........ in the summer?

It's hot

A. Likes

B. Like

C. To like

D. Is like

9. What are you going to do in Hue?

I'm going........... the citadel

A. Visit

B. To visit

C. Visits

D. To visiting

10. Why don't we......... to Huong pagoda?

A. Visit

B. To visit

C. Visits

D. To visiting

11. ........ are you going to stay?

A. How long

B. How

C. How often

D. How old

14. ...... are you going to stay?

....... two weeks

A. How long-in

B. How often -for

C. How long-for

D. How long -at

15. She listen to music....... a week

A. Two times

B. Twice

C. Twice a week

D. Two

16. Mary is used to........ her homework by herself.

A. Do

B. Doing

C. To do

D. Did

17. Tom used to......to school by bus. Now he goes by bike

A. Go

B. Going

C. to go

D. Went

18. I'm from Vietnam. I...... driving on the right

A. use to

B. Used to

C. Am used to

D. Get used

19. My uncle...... policeman when I was young

A. Used to

B. Used to be

C. Used to being

D. Used have been

20. Helen....... to me very often, but now she phones

A. Used to write

B. Has written

C. Wrote

D. Writes

21. Tamara didn't........... do morning exercise. Now he is getting fat.

A. Used to

B. Use to

C. Get used to

D. Be used to

22. A lot of people use mobile phones nowadays. Telephone......... communicating through long distances

A. Are used for

B. Used for

C. Used to

D. Are used to

23. It's took me quite a long time to......... wearing these glasses

A. Be used to

B. Used to

C. Get used to

D. Be used to

24.There was a big tree in our garder but it has justbeen cut down. These........a big tree there.

A. Is used to

B. Has been

C. Is

D. Used to be

25.come into the kitchen,.......?

A. Do you

B. Will you

C. Won't you

D. B and D

26. You're never been in Italy,.........?

A. Have you

B. Haven't you

C. Been you

D. Had you

27. He hardly has anything nowadays,.......?

A. Hasn't she

B. Has he

C. Doesn't he

D. Does she

28. They must do as they are told,........?

A. Mustn't they

B. Has he

C. Doesn't he

D. Does she

29. This is the second time she's been here,........?

A. Does she

B. Isn't it

C. Doesn't she

D. Did she

*stressed differently

1. A. Picture

B. Business

C. Stranger

D. Return

2. A. Museum

B. Cinema

C. Hospital

D. Concert

3. A. Performance

B. Unknown

C. Visit

D. Tomorrow

5. A. Memory

B. Article

C. Newspaper

D. Edition

Hộ mình với ạ

死mình cảm ơn ạ :33

* make sentence

1. Bobby/ sad / because / not pass / exam.

2. Why / you / not come / my house / last weekend?

3. It / often / take / 15 minutes / get / school / foot.

4. Mozart /can play / violin /when /only /three years old.

5. What / Peter /do /when /Helen / phone /him?

6. There /not be /any snow /my village /last winter /so we/ can not /go skiing .

7. The Green / watch/ live football match /TV /when /Mr. Clark arrive.

8.while Susan/ Daisy /make /cakes / phone / ring.

9. If /he / invite /party /she /accept.

10. If / your cousin /try /pass/ examination.

11. While people /talk / other / he /read / his book.

12. I / see/the accident when I / wait / the taxi.

13. He /begin /take pride /use /braids /avoid trouble.

14. It seem /thet we /no longer take pride /our oral heritage.

Hộ mình với ạ

Mình cảm ơn các bạn nhiều :33

* rewrite

1,would you like me to make you some tea/. I will...............

2,we enjoy playing football very much /. We are................

3,James is able to draw much more beautiful than his friend/. James's friend can't...........

4, they are never late for school /. They always go............

5, why don't you take a short nap every morning ?/. I suggest..................

6, I walk to school in fifteen minutes every morning /. It takes..........

7, how long is it since you used the car ?/. When.............

8, we started living here 15 years ago /. We have.................

9, let's meet inside the center at the cafe corner ?/. How.........

10, I've never eaten this kind of cake /. It's.................

11, they drank so much coffee that they shouldn't sleep all night /. They drunk.................

12, Alice had so many exercises to do that she couldn't go out /. Alice had........

13, the woman was so poor that she needed everyone's help /. She was..................

14,Tam doesn't type as fast as she used to /. Tam ...............

Hộ mình với ạ :33

Mình cảm ơn ạ