K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

17 tháng 7 2021

Tên 

CTHH 

Phân loại 

Tên  

CTHH  

Phân loại  

Kali oxit  

K2

 

Oxit bazo 

Canxi oxit  

CaO 

Oxit Bazơ 

Cacbon đioxit  

CO2 

 

Oxit Axit 

Sắt (III) oxit  

Fe2O3 

Oxit Bazơ 

Lưu huỳnh đioxit 

SO2 

Oxit Axit 

Lưu huỳnh trioxit  

SO3 

Oxit Axit 

Đi photpho pentaoxit  

P2O5 

Oxit Axit 

Đồng (II) oxit  

CuO 

Oxit Bazơ 

(Đã sửa lại những lỗi sai nhé)

11 tháng 4 2017

Tính chất của nhôm

ứng dụng của nhôm

1

Dẫn điện t ốt

làm dây dẫn điện

2

Nhẹ, bền

Chế tạo máy bay, ô tô, xe lửa ,….

3

nhôm dẻo nên có thể cán thành đồ dùng bằng nhôm

làm dụng cụ gia đình: nồi xoong, khung cửa…..



12 tháng 4 2017

Giải

Có liên kết đôi Làm mất màu dd Brom Phản ứng trùng hợp Tác dụng với oxi
Metan không không không
Etilen có 1 liên kết đôi

13 tháng 4 2017
Có liên kết đôi Làm mất màu dd Brom Phản ứng trùng hợp Tác dụng với oxi
Metan không không không
Etilen có 1 liên kết đôi
28 tháng 4 2017

a) Phản ứng giữa các dung dịch trên đều thuộc loại phản ứng trao đổi, muốn xảy ra được sản phẩm phải có chất không tan, chất khí hoặc H2O.

Hỏi đáp Hóa học

28 tháng 4 2017

Phương trình hóa học của các phản ứng:

Pb(NO3)2 + Na2CO3 2NaNO3 + PbCO3

Pb(NO3)2 + 2KCl → 2KNO3 + PbCl2

Pb(NO3)2 + Na2SO4 → 2NaNO3 + PbSO4

BaCl2 + NaCO3 → 2NaCl + BaCO3

BaCl2 + Na2SO4 → 2NaCl + BaSO4


14 tháng 10 2020
Na2CO3 KCl Na2SO4 NaNO3
Pb(NO3)2 x x x o
BaCl2 x o x o

Phương trình hóa học của các phản ứng:

Pb(NO3)2 + Na2CO3 → PbCO3 ↓ + 2NaNO3

Pb(NO3)2 + 2KCl → PbCl2 ↓ + 2KNO3

Pb(NO3)2 + Na2SO4 → PbSO4 ↓ + 2NaNO3

BaCl2 + Na2CO3 → BaCO3 ↓ + 2NaCl

BaCl2 + Na2SO4 → BaSO4 ↓ + 2NaCl.

12 tháng 2 2020

I) Lập CTHH của các chất có thành phần hóa học sau:

a. Na và O

Na2O

d. Ca và OH

Ca(OH)2

g. Na và HSO3

NaHSO3

b. Mg và Cl

MgCl2

e. K và PO4

K2PO4

i. Ba và H2PO4

Ba(H2PO4)2

c. Al và O

Al2O3

f. H và SO4

H2SO4

k. Mg và CO3

Mg2CO3

II) Lập CTHH của các chất có tên gọi sau:

a. Natri clorua

NaCL

d. Sắt (II) oxit

FeO

g. Bari sunfit

BaSO3

b. Nhôm sunfat

Al2(SO4)3

e. Canxi oxit

CaO

i. Magie cacbonat

MgCO3

c. Bạc nitrat

AgNO3

f. Đồng (II) hidroxit

Cu(OH)2

k. Sắt (II) sunfua

FeSO3

III) Điền CTHH thích hợp vào chỗ trống hoàn thành PTHH sau:

a. S + .O2 -> SO2

d. Na2SO3 + 2.HCl-> 2NaCl + H2O

b. SO2 + H2O -> H2SO3

e. CaO + .2HCL -> CaCl2 + .H2O.

c. H2SO3 +Na2O-> Na2SO3 + H2O

g. Fe2O3 + H2SO4-> Fe2(SO4)3 +H2O
12 tháng 2 2020

thaks b nha!!

Oxit axit Oxit bazơ
1. \(SO_3+H_2O\rightarrow H_2SO_4\) 1. \(K_2O+H_2O\rightarrow2KOH\)
2. \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\) 2. \(CaO+2HCl\rightarrow CaCl_2+H_2O\)
3. \(P_2O_5+3K_2O\rightarrow2K_3PO_4\) 3. \(SO_2+BaO\rightarrow BaSO_3\)
\(2HCl+BaO\rightarrow BaCl_2+H_2O\) Bonus:\(SO_2+2KOH\rightarrow K_2SO_3+H_2O\)

Choose the best option to complete each of the following sentences.  5. You can speak English fluently, __________?A. could youB. can’t you C. can you D. couldn’t you   6. On average, _________Moon is 384.400 km from ___________ Earth.A. the-theB. x-theC. a-an D. a-the  7. _________ my opinion, he is the best football player in our team.A. OnB. AtC. InD. From  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and...
Đọc tiếp

Choose the best option to complete each of the following sentences.

  5. You can speak English fluently, __________?

A. could you

B. can’t you

C. can you

D. couldn’t you

  6. On average, _________Moon is 384.400 km from ___________ Earth.

A. the-the

B. x-the

C. a-an

D. a-the

  7. _________ my opinion, he is the best football player in our team.

A. On

B. At

C. In

D. From

  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and friends.

A. give

B. send

C. have

D. receive

  9. The driver stopped ______ a coffee because he felt sleepy.

A. have

B. to have

C. having

D. had

  10. I wish I ______ play football well.

A. can

B. could

C. am

D. did

  11. If I ________ you, I would join this English Speaking Contest.

A. were

B. am

C. would be

D. will be

  12. _______ there is a lot of noise in the city, I like living there.

A. Because

B. Despite

C. In spite of

D. Although

  13. I suggest ________ a shotcut through the field . It will take much less time.

A. take

B. taking

C. to take

D. takes

  14. She has a lot of ___________ while she’s studying English.

A. difficult

B. difficulties

C. difficile

D. diffident

   15. He finds the way to a place easily. He was a very good sense of ___________

A. direction

B. humor

C. style

D. responsibility

16. There are lots of people who _____ work in remote and mountainous areas  nowadays.

A. volunteers

B. voluntary

C. voluntarily

D. volunteer

   17. If you want to _____ the other students in your class, you’ll have to work very hard.

A. catch up with

B. learn on

C. catch up

D. hurry up

 

  Mark the letter A, B,C or D to indicate the correct answer to each of the following        questions.

  18. -  Mary: “ Thank s for your help, John.”    

        - John:   “ ______________”

A. There’s nothing

C. It’s my pleasure

B. Nothing

D. It sounds good

   19. – Lan: “ Do you think Covid-19 is one of the most dangerous diseases?”

         -  Mai: “ ________________”

A. Well that’s very surprising

C. Not at all. Go ahead.

B. Sure. Thanks.

D. There’s no doubt about it.

   

  Choose one underlined part that is incorrect in each of the sentences.

   20. Some of the students seemed very nervously before the final exam.

             A                         B                                    C          D

   21. The number of students are not large, therefore, a number of tickets are available to   

               A                                      B                                                   C                                          D

   them.   

    22. You should take the raincoat with you in case it will rain hard this afternoon.

                                A                         B               C              D

    23. Her sister always runs more quickly as her.

                                A       B               C       D                   

    24. As soon as he completes his homework, he helps feed the chickens and collects the

                                     A                         B                                              C                 D

     eggs.

    Choose the sentence that is closest in meaning to each of the sentences given.

    25. My father often played football when he was young.

    A. My father used to play football when he is young.

    B. My father used to play football when he was young.

    C. My father used to playing football when he was young.

    D. My father used to playing football when he be young.

    26. The teacher said “ You must prepare your lessons before going to class”.

    A. The teacher said that you must prepare your lessons before going to class.

    B. The teacher said that we must prepare your lessons before going to class.

    C. The teacher said that we had to prepare our lessons before going to class.

    D. The teacher said that we had to  preparing our lessons before going to class.

    27. He bought this book last week.

    A. This book was bought by him last week.

    B. Last week, this book was bought by him.

    C. This book is bought by him last week.

    D. This book was bought by he last week.

    Choose the sentence that best combines each given pair of sentences.

    28. I was very tired. I went to bed early.

    A. I was very tired but I went to bed early.

    B. Although I was very tired but I went to bed early.

    C. I went to bed early when I was very tired

    D. I went to bed early because I was very tired.

   29. He was sitting on a chair. It was uncomfortable.

    A. The chair who he was sitting on was uncomfortable.

    B. The chair which he was sit on was uncomfortable.

    C. The chair which he was sitting on was uncomfortable.

    D. The chair whom he was sitting on was uncomfortable.

30. They heard about his bad marks. They were sad.

   A. They are sad that they heard about his bad marks.

   B. They were sad because of they heard about his bad marks.

   C. They were sad that they heard about his bad marks.

   D. They were sad so they heard about his bad marks.

   Read the following passage and choose the correct answer.

       I began teaching career nearly six years ago. I spent six years (31) _____ in a remote      village where the villagers were very poor and the living standard was low. Sometimes I was very (32)______ because of bad living condition (33)________ low pay. I was really homesick. However, at that time, with my youth enthusiasm. I tried my best to devote myself to the noblest career that was ‘teaching’. I love my poor (34)________ students (35)_______ were living in poverty. Despite the poor life, they couldn’t suffer from empty mind.

31. A. taught

B.  teaching

C. teaches

D. to teach

32.A disappointed

B. disappoints

C. disappointing

D. disappoint

33. A. so

B. because

C. and

D. although

34. A. few

B. less

C. some

D. little

35. A. who

B. which

C. whom

D. where

Read the passage and choose the best answer for each question.

Truong Yen Festival is from the 9th to the 11th day of the third lunar month, the main festival day is on the 10th day of the third lunar month. This festival is celebrated in Truong Yen Commune, Hoa Lu District, Ninh Binh Province and by the locals. The festival is in memory of the Kings of the Dinh and Le dynasties. The festival lasts for three days with many traditional games and martial arts. There are many cultural and sports activities, including a procession to carry water from the Hoang Long River to the King Dinh and King Le temples, a drum festival, and volleyball, human chess, and folk games... The most special about the Truong Yen Festival is a game called " maneuver game with red flag", which replays the childhood of Dinh Bo Linh as a buffalo boy in Truong Yên.

 36. What is the best title of the passage?

A. The Kings Festival

C. Activities of a Festival   

B. The Festival in Ninh Binh Province

D. Truong Yen Commune

 37. How long does Truong Yen Festival last?

A. Three days        

C. On the 10th day 

B. From the 9th to the 11th day.

D. During the third lunar month.

38. What is the most special about the Truong Yen Festival?

A. Many traditional games and martial arts.

B. Many cultural and sports activities.

C.  The game replays the childhood of the King Dinh.

D.  In memory of the Kings of the Dinh and Le dynasties.

39. What does the word “which” in the passage mean?

A. Martial arts         B. Cultural activities           C. Sports activities        D. A game

40. Which of the following is not TRUE?

A. The festival is in honor of the Kings of the Dinh and Le dynasties.

B. The third day of the tenth lunar month is the main festival day.

C. There are many traditional games and martial arts.

       D. Dinh Bo Linh was a buffalo boy in Truong  Yen      

2
4 tháng 3 2022

Có gì đó sai sai thì phải, Anh -> Hoá:)

4 tháng 3 2022

  5. You can speak English fluently, __________?

A. could you

B. can’t you

C. can you

D. couldn’t you

  6. On average, _________Moon is 384.400 km from ___________ Earth.

A. the-the

B. x-the

C. a-an

D. a-the

  7. _________ my opinion, he is the best football player in our team.

A. On

B. At

C. In

D. From

  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and friends.

A. give

B. send

C. have

D. receive

  9. The driver stopped ______ a coffee because he felt sleepy.

A. have

B. to have

C. having

D. had

  10. I wish I ______ play football well.

A. can

B. could

C. am

D. did

  11. If I ________ you, I would join this English Speaking Contest.

A. were

B. am

C. would be

D. will be

  12. _______ there is a lot of noise in the city, I living there.

A. Because

B. Despite

C. In spite of

D. Although

  13. I suggest ________ a shotcut through the field . It will take much less time.

A. take

B. taking

C. to take

D. takes

  14. She has a lot of ___________ while she’s studying English.

A. difficult

B. difficulties

C. difficile

D. diffident

   15. He finds the way to a place easily. He was a very good sense of ___________

A. direction

B. humor

C. style

D. responsibility

16. There are lots of people who _____ work in remote and mountainous areas  nowadays.

A. volunteers

B. voluntary

C. voluntarily

D. volunteer

   17. If you want to _____ the other students in your class, you’ll have to work very hard.

A. catch up with

B. learn on

C. catch up

D. hurry up

 

22 tháng 5 2021

1.A
2.A

3.C

24 tháng 5 2021

C1: A       2:A      3:D

Good luck!

Câu 2. Dãy chất nào dưới đây gồm các oxit bazơA. CO2, CaO, K2OB. CaO, K2O, Na2OC. SO2, BaO, MgOD. FeO, CO, CuOCâu 5. Dãy chất nào dưới đây gồm các oxit tác dụng được với nước?A. CaO, CuO, SO3, Na2OB. CaO, N2O5, K2O, CuOC. Na2O, BaO, N2O, FeOD. SO3, CO2, BaO, CaOCâu 15. Cặp chất nào sau đây cùng tồn tại trong dung dịch?A. HCl, KClB. HCl và Ca(OH)2C. H2SO4 và BaOD. NaOH và H2SO4 Câu 16. Dãy nào sau đây gồm tất cả các chất...
Đọc tiếp

Câu 2. Dãy chất nào dưới đây gồm các oxit bazơ

A. CO2, CaO, K2O

B. CaO, K2O, Na2O

C. SO2, BaO, MgO

D. FeO, CO, CuO

Câu 5. Dãy chất nào dưới đây gồm các oxit tác dụng được với nước?

A. CaO, CuO, SO3, Na2O

B. CaO, N2O5, K2O, CuO

C. Na2O, BaO, N2O, FeO

D. SO3, CO2, BaO, CaO

Câu 15. Cặp chất nào sau đây cùng tồn tại trong dung dịch?

A. HCl, KCl

B. HCl và Ca(OH)2

C. H2SO4 và BaO

D. NaOH và H2SO4

 

Câu 16. Dãy nào sau đây gồm tất cả các chất đều tác dụng được với dung dịch HCl?

A. Mg, KOH, CuO, CaCO3

B. NaOH, Zn, MgO, Ag

C. Cu, KOH, CaCl2, CaO

Câu 20. Dãy chất nào dưới đây tác dụng được với dung dịch H2SO4 loãng?

A. BaO, CuO, Cu, Fe2O3                                                           B Fe, NaOH, BaCl2, BaO

C. Cu, NaOH, Cu(OH)2, Na2O                                                

D. P2O5, NaOH, Cu(OH)2, Ag

Câu 21. Chất nào dưới đây không tác dụng được với axit H2SO4 đặc nguội

A. Cu

B. Al

C. Mg

D. Zn

Câu 22. Muối pha loãng axit sunfuric đặc người ta làm như thế nào?

A. Rót từ từ nước vào lọ đựng axit                       

B. Rót từ từ axit đặc vào lọ đựng nước

C. Rót nhanh nước vào lọ đựng axit               D. Rót nhanh axit đặc vào lọ đựng nước

Câu 24. Dãy dung dịch nào dưới đây không làm quỳ tím đổi thành màu xanh là:

A. NaOH, KOH, Cu(OH)2

B. NaOH, Ca(OH)2, Cu(OH)2

C. KOH, Fe(OH)2, Ca(OH)2

D. Cu(OH)2, Fe(OH)3, Mg(OH)2

D. Mg, KOH, CO2, CaCO3

 

1
12 tháng 12 2021

2.B

5.D

15.A

16.A

20.B

21.B

22.B

24.D

tính chất kim loại phi kim
trạng thái ở nhiệt độ thường

hầu hết là rắn

( trừ Hg)

rắn, lỏng, khí
nhiệt độ sôi rất cao thấp
nhiệt độ nóng chảy cao thấp
dẫn điện tốt

không dẫn điện

( trừ than chì dẫn điện kém)

dẫn nhiệt tốt kém

20 tháng 11 2018

Trần Hữu Tuyển, Hoàng Tuấn Đăng, Nguyễn Trần Thành Đạt, Azue, Rainbow, Nguyễn Anh Thư, Phùng Hà Châu, Võ Đông Anh Tuấn, Gia Hân Ngô, Hung nguyen, Trương quang huy hoàng, Khánh Như Trương Ngọc, Vũ Thị Thu Hằng, Hùng Nguyễn, muốn đặt tên nhưng chưa nghĩ ra bạn nào tốt nghĩ giùm mk, Hà Yến Nhi, Ten Hoàng,Khả Vân, Thảo Phương ,...