Câu 1: Nguyên tử nguyên tố R có tổng số hạt mang điện và không mang điện là 10. Số hạt mang điện nhiều hơn số hạt không mang điện là 2. Tìm p,n, e.

Câu  5: Viết các PTHH thực hiện dãy chuyển hoá sau: S → SO2 → SO3 → H2SO4 → CuSO4 → CuCl2 →Cu(OH)2 →CuO →Cu →CuSO4

there isn't ... coffee in my cup           a) many b)much c)a lot

Mọi người giúp em bài này với ạ. Em cảm ơn 

Cho tam giác ABC, M là trung điểm của BC. Lấy D đối xứng với với A qua M

a) Chứng tỏ ABCD là hình bình hành

b) Lấy E thuộc AB, F thuộc DC sao cho AE= DF. Chứng tỏ AEDF là hình bình hành

c) Chứng tỏ BECF là hình bình hành

d) Chứng tỏ E và F đối xứng nhau qua O

have you got ... english books?                                                                                                                   a) much b)many c)a lot

3. Our dustbins (empty)..... .... every Monday.
4. Just as I (wonder).............what to do next, the phone rang.
5. Maryam wishes she (have)................a trip to Vietnam again next year.
6. Congratulations, Trang. You (just, win)..............the first prize in the English Speaking Contest.

Bài 20:Tính nồng độmol các chất trong dung dịch sau: 
 
a.300 ml dung dịch A chứa 15,9 g Na2CO3        ĐS: 0,5M

b.400 ml dung dịch X chứa 7,3 g HCl và 8,775 g NaCl.      ĐS: 0,5M & 0,375M

giúp em với ah cần gấp

Câu8:Cho 3,2g hỗn hợp CuO và Fe2O3 tác dụng hết với dung dịch HCl thu được 2 muối tỉ lệ mol 1 : 1Số mol HCl đã tham gia phản ứng là:
A. 0,1 mol B. 0,15 mo C. 0,2 mol D. 0,25 mol

   giải thích và cách giải

1. Our friends suggest (go).................... on a picnic next week 

Bài 19:Tính sốmol của các chất trong các trường hợp sau:
6,72 lít khí H2( đktc)
560 ml khí CO2( đktc)
22,2 g CaCl2
200 ml dung dịch NaCl 0,2 M
27 gam glucozơ (C6H12O6)
150 ml dung dịch AlCl30,3 M

giúp em vs ah cần gấp ah 

Choose the best answer.

   1.      What ………….. now is a glass of a cold drink. (he want / does he want / he wants / he is wanting)

   2.      Why not ………….. some where for a change tonight? (go / going / to go / goes)

   3.      The number of students studying abroad …………. today. (increase / increases / is increasing / are increasing)

   4.      I know him but I ………… remember what his name right now. (don’t / not / am not / haven’t)

   5.      She …………..a good time on the beach at present. (is having / have / has / having)

   6.      I …………….. myself so much today. (enjoy / am enjoying / enjoys / enjoying)

   7.     The baby …………… very happy when he sees his mother. (look / looks / is looking / are looking)

   8.      People ……... there is life on other planet nowadays. (believe / believes / to believe / are believing)

   9.      Hardly ……….….to school late. (he goes / does he go / he is going / is he going)

10.      Life ……….for the better in many parts of the world. (change / changes / is changing / changing)

1. My parents are very busy. They spend a lot of time taking care of us. (although)
My parents................................................very busy.
2. He said to her, “My parents are proud of my good marks this year." (told)
Не....................................... year 
3. The air in the city is not pure, so we are not healthy.(would)
- We............................................ pure
4. The monitor made no comment on the situation. He was appointed just last week. (who)
The monitor........................................... on thesituation.
5. Everyone has to wear safety helmets at all times. (be)
Safety helmets.............................................................at all times.

Tính hợp lí : 

$\left(\frac{-2}{3}\right).0,75+1\frac{2}{3} : \left(\frac{-4}{9}\right) + {\left(\frac{-1}{2}\right)}^2$

IX. Mark the letter A, B, C or D to indicate that underlined part that needs correction in each of
the following sentences.
1. As soon as I know, Nga Son mats village has existed for more than 150 years with many ups and
downs.
2. Tho Ha village gate has nice, large and antique architecture making by skillful hands of the village’s
craftsmen.
3. Chinese Painting became popularly around 581 AD since more and more people began to
appreciate its beauty.
4. In order that promote the development of the craft village, more support from local authorities is
needed.
5. Careful planning is very important to help craft villages growing and flourish to attract more tourists
to the country
6. All families in Phuoc Tich village earned their living from making ceramics for the past 500 years.
7. Some of the most excited architecture in Britain can be found in Manchester and the nearby Salford
Quays area.
8. Artisans in the traditional craft village are facing difficulties in seeking markets for their product