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11 tháng 12 2020

Lớp 7 mà có Hoá học ??!??!?

29 tháng 1 2021

Chào em, em tham khảo nhé!

1.I (be)......(am/was/were/is) happy after the summer vacation in Nha Trang.

Ở câu này em để ý có dấu hiệu chỉ thời gian after the summer vacation in Nha Trang, đây là dấu hiệu thời gian trong quá khứ. Vậy ở đây chúng ta cần chia động từ ở thì quá khứ đơn.

2. Her father wrote sick.....(note/paper/ record/ check) because she was ill.

Chúng ta có cụm từ sick note: giấy xin phép nghỉ ốm em nhé!

Chúc em học tốt và có những trải nghiệm tuyệt vời tại olm.vn!

29 tháng 1 2021
Dak.em cảm ơn thầy nhiều ạ, thầy có hướng dẫn cụ thể ạ
4 tháng 7 2021

Phản ứng tạo thành dd có màu trong suốt

\(PTHH:H_2SO_4+2NH_3\rightarrow\left(NH_4\right)_2SO_4\)

I). Change thế sentences into pasive.  1. Peter is writing a letter to his friend   2. My friends making some phone calls in the evening.    3. B ad drivers are causing many accidents    4. The children are  eating a lot of sweets   5. Nam is repairing mt piano at the moment   6. They are demolishing the entire block   7. Someone is cutting the glass now   8 The factory is producing more and more pollution9 Someone is showing her now to do it10 The boys are plantting some trees in the...
Đọc tiếp

I). Change thế sentences into pasive.

  1. Peter is writing a letter to his friend

   2. My friends making some phone calls in the evening.

    3. B ad drivers are causing many accidents

    4. The children are  eating a lot of sweets

   5. Nam is repairing mt piano at the moment

   6. They are demolishing the entire block

   7. Someone is cutting the glass now

   8 The factory is producing more and more pollution

9 Someone is showing her now to do it

10 The boys are plantting some trees in the garden

11 Lan was prepairing that report when i came to see him

12. waiters and waitresses were serving customers

13. The president was signgs those papers

14. Was mary helping her mother in the kitchen at the time?

15. The head teacher was making the announcement

16 Someone was cleaning the windows while I was there

17 They sere preseting the athletes to the spectators when we came

18 Someone is making the coffee when I walk into the kitchen

19 They have sold their car to pay debts

20 No one has opened the windows for ages

21 No one has over asked me that question before

22 They haven't done anything since he left

23 A doctor has just examined Jonh

24 They haven't used this machine for ages

25 Peter has sung this song

26 They have paid doctor a lot of money 

   

0
13 tháng 6 2021

Cái chất gì kì cục vậy em ? Nói đúng tên.

13 tháng 6 2021

$H_2SO_4$ : Axit sunfuric

$C_2H_6$ : Etan hay Ethane

Cả hai chất đều độc khi tiếp xúc với hàm lượng nhỏ

3 tháng 8 2021

1)

(+) He goes to the cinema every Sunday

(-)  He doesn't go to the cinema every Sunday.

(?) Does he go to the cinema every Sunday ?

2) 

(+) James s strawberry.

(-) James doesn"t strawberry

(?) Does James strawberry ?

3)

(+) They work in this sofeware company.

(-) They don't work in thí sofeware company.

(?) Do they work in this sofeware company ?

4)

(+) His new trousers are back

(-)  His new trousers aren't back.

(?) Are his new trousers back ?

- Hok T - 

3 tháng 8 2021

1cm=?mm

Exercise 1: Fill in the blanks with SO, TOO, EITHER or NEITHER and auxiliary verb.1.Jim goes to school every day, _________Mary/ Mary ______2. Carol studied Biology, _________Paul/ Paul ________ 3.Mai is a very good student, ______Phuong/ Phuong_______4. Lily can't play the guitar, _________Rosie/ Rosie _________ 5. Mariana bakes delicious cakes, ________Cindy/ Cindy _________6. Ngoc Anh will sing tomorrow _______Mai/ Mai ___________ 7. Jonathan did the homework, _______Michael/ Michael...
Đọc tiếp

Exercise 1: Fill in the blanks with SO, TOO, EITHER or NEITHER and auxiliary verb.

1.Jim goes to school every day, _________Mary/ Mary ______

2. Carol studied Biology, _________Paul/ Paul ________ 

3.Mai is a very good student, ______Phuong/ Phuong_______

4. Lily can't play the guitar, _________Rosie/ Rosie _________ 

5. Mariana bakes delicious cakes, ________Cindy/ Cindy _________

6. Ngoc Anh will sing tomorrow _______Mai/ Mai ___________ 

7. Jonathan did the homework, _______Michael/ Michael __________

8. Erick has told a funny joke, ______ Sarah/ Sarah _________

9. They didn't eat the salad, ______I/ I _________

10. My mother hasn't finished the juice, _______my sister/ My sister __________ 

 

Exercise 3: Complete the sentences by using TOO and EITHER.

1. We often go swimming in the summer and they____________

2. John can ride a horse. I_________ 

3. Nam didn't come to the party last night and Minh___________ 

4. I will buy some oranges and pineapples. He___________ 

5. They don't want to go out tonight and we___________ 

6. The pineapples aren't ripe, and the bananas___________ 

7. Nam is hungry and his friends___________ 

8. Jane won’t come. Peter___________ 

9. Hoa had a medical check-up yesterday morning. We___________ 

10. He can't swim and his brother___________ 

 

0
30 tháng 7 2021

mCuO = 8 (g), mFe3O4 = 23,2

=> nCuO = 0,1 (mol), nFe3O4 = 0,1 (mol)

Bảo toàn Cu => nCu = nCuO = 0,1(mol) => mCu = 6,4(g)

Bảo toàn Fe => nFe = 3nFe3O4 = 0,3 (mol)=> mFe=16,8 (g)

Gọi nCO = x(mol) => nCO2.= x (mol)

Theo đlbtkl: mCO2 - mCO = moxit - mkloai = 31,2-6,4-16,8=8

=> 44x - 28y= 8 => x = 0,5 (mol)

=> VCO = VCO2 = 11,2(l)

 

30 tháng 7 2021

lớp naò đâu có quan trọng hả bạn