Câu 8: Cho 200g dd BaCl2 20,8% tác dụng vừa đủ với dd Na2SO4 dư. Tính khối lượng kết tủa thu.

Câu 9: Dẫn từ từ 1,568 lít khí CO2 (đktc) vào dung dịch chứa 6,4 gam NaOH, sản phẩm thu được là Na2CO3. Tính khối lượng muối thu được.

Câu 10: Cho 100 ml dd NaOH 1M tác dụng với 100 ml dung dịch HCl 2M. Tính khối lượng muối trong dung dịch thu được.

Đặt vào hai đầu dây dẫn HĐT là 15V thì CĐDĐ là 0,3A.

a) Tính điện trở của dây dẫn?

b) HĐT hai đầu dây tăng thêm 30V thì CĐDĐ là bao nhiêu?

Viết bài văn thuyết minh về cây tre 

tìm 3 số chẵn liên tiếp bt rằng tích của 2 số đầu ít hơn tích của 2 số cuối 192 đơn vị

Cho hình bình hành ABCD. Gọi K, I lần lượt là trung điểm của AB và CD. Gọi M, N là giao điểm của AI, CK với BD. Chứng minh:

a) tam giác ADM=CBN

b) góc ADM=NCA và IM//CN

c) DM=MN=NB

Benefits of playing sports

Firstly, playing sports can give you a healthy life and a fit body to you. You will be

more active and healthier (1) __________ playing sports. To illustrate, you can have a lower

chance of getting a serious illness such as (2) __________ attack or high blood pressure.

In other words, it increases your resistance to illness. In leisure time, you can play

sports (3) __________ your friends or your relatives, this not only helps you but (4)

__________motivates everyone around you to take part in sports and have good (5)

__________ .

Furthermore, there are some (6) __________ which you can play easily such as table

tennis, tennis or football and after that, you feel completely relaxed or (7) __________ free

from your stress. Moreover, you also need to allow (8) __________ encourage children to

play sports, especially some outside activities such as football, basketball or volleyball to

decrease the time that your children (9) __________ sitting in front of computers or

watching television. 

I. Choose the more appropriate

1. Of the four dresses, I like the red one (better/

2. Pil is the thappier/ happiest) person we know.

3. Pat's car is (faster/ fastest) than Dan's.best).

4. This is the (creamier/ creamiest) ice-cream I have had in a long time.

5. This poster is (colourfuler/ more colourful) than the one in the hall.

6. Does Fred feel (weller better) today than he did yesterday?

7. This vegetable soup tastes very good/ best).

8. While trying to balance the baskets on her head, the woman walked (awkwardemore awkwardly) than her daughter.

9. Jane is the less least) athletic of all the women.

10. My cat is the (prettier/ prettiest) of the two.

11. This summary is (the better the best) of the pair.

12. The colder the weather gets, (sicker/ the sicker) I feel.

13. Jim has as (few/ fewer) opportunities to play tennis as I have.

14. That recipe calls for (many/ much) more sugar than mine does.

15. The museum is the (further/ furthest) away of the three buildings.II. Complete the sentences using the correct form of the adjectives or adverbsin brackets.1. Mary is (pretty) as her sister.2. A new house is (expensive) than an old one.