Bài 1: ngậm một lá sắt có khối lượng 28g trong 250ml dd CuSO₄ . Sau khi phản ứng hoàn toàn, người ta lấy thanh sắt ra khỏi dd , rửa nhẹ làm khô thì cân nặng 28,8g 

a, hãy viết pthh
b, tính nồng độ C_M của dd CuSO₄
Bài 3: cho 20g dd muối sắt clorua 16,25% tác dụng với nitrat dư tạo thành 8,61g kết tủa. Hãy tìm công thức của muối   sắt

III. Choose the best answer

1. The professor suggested he _ the research before March.  A. summit   B. summiting  C. summits
2. Her leader suggested _____ on time.         A. being    B. be               C. is
3. We have suggested _____ to London for this winter vacation.   A. going   B. go               C. should go
4. I suggested that we _____ Peter to the party. A. should invite          B. invite         C. Both are correct

5. I wish there ……… a orgnisation for social activities for teenagers

A. is                B.were            C. will be                   D. are

6. She wishes her village…………access to clean piped water.  A. had         B. has    C. will have    D.have

7. I wish I ……really excelllent to make them proud.    A. can study    B. study    C. will study   D.could study
8. He ran _________ than his friend

a. fastest                     b. faster                      c. more fast                            d. more fastly

9. This summer is not as hot _________ last summer

a. as                            b. than                        c. to                             d. like

10.. The people here are _________ than I expected

a. more nice               b. most nice               c. nicer                                   d. nicest

I. Put the verbs in brackets into correct tenses:

1. I wish I (go)……………………………. to the movie with you.

2. I wish I (have)………… …… day off.

3. I wish I (can study)…………… Latin instead of Greek

4. I wish I (not / spend)………………………………. so much money now.

5. I wish the weather (be) …………..…………….warm

6. I wish I (not be)………….……………….. at home

7. I wish I (not/ buy) …………….……………..that book

8. I wish I (can/see) ……………….…………….him.

9. I wish he (be)……………a millionair

10. My brother is an architect. He suggests (build)_________new buildings

11. I suggest that they (transform)…….outfit because I can get used to ( see)……their weird clothes.