1)Một lượng khí cótcó tích ở 4m³ ở 7⁰c. Nung nóng đẳng áp lượng khí trên ở nhiệt độ 27⁰c, thể tích lượng khí sau nung nóng là

A. 4,29m³

B.3,73m³

C.15,43m³

D. 42,9m³

Cho những chất sau: KMnO₄; MnO₂; K₂Cr₂O₇ , KClO₃ tác dụng dd HCl đặc

a) Nếu các chất oxi hóa có số mol bằng nhau thì chất nào có thể điều chế khí clo nhiều hơn?

b) Nếu các chất oxi hóa có khối lượng bằng nhau thì chất nào có thể điều chế khí clo nhiều hơn?

Exercise 1: In each group, there is one sentence that is NOT right. Write "X" beside the WRONG sentence.

1. a.... The children are excited about thier new clothes.

b.... The children are exciting about thier new clothes.

c.... The new clothes are exciting to the children.

d.... Wearing new clothes is always exciting.

2. a.... They were tired from walking a long way.

b.... Walking a long way tired them.

c.... Walking a long way was tiring.

d.... They were tiring from walking a long way.

3. a.... His ideas fascinate me.

b.... His ideas are fascinating to me.

c....His ideas fascinated to me.

d.... I'm fascinated by his ideas.

4. a... The horror movie is frightened.

b.... The horror movie is frightening.

c.... We are frightened by the horror movie.

d.... The horror movie frightens us.

5. a.... His explanation was confusing.

b. .... His explanation confused me.

c.... I was confused about his explanation.

d.... I was confusing about his explanation.

6. a.... His jokes are amused to her.

b.... His jokes are amusing to her.

c.... His jokes amuse her.

d.... She is amused by his jokes.

7. a.... We were disappointed with the results.

b.... We were disappointing with the results.

c.... The results were disappointing.

d.... The results were disappointed us.

8. a.... They were worried about the news.

b.... They new was worrying.

c.... They new worried them.

d.... They new was worried.

Exercise 2: complete each sentence by choosing a word from the box

1. I asked Derek if he wanted to go to the movies with us, but he wasn't ....

2. I[t's sometimes ... when you have to as[k people for money.

3. The lecture was so ... that most of the students fell asleep.

4. The bos was so ... with Jeffs work that he promised him a promotion.

5. We were ... in the movie. It was not as good as we'd expected.

6. It was quite ... that he pased the exam. I could hardly believe iy.

7. The comedion's performance was ... . He made the audience laugh all the time.

8. Everybody was ... because the lectures đin't explain the problem clearly.

9. The news was .... All pf us really felt sorry for the victims off the disaster.

10. Monica is starting a neww job toorrow. She's very .... about it.

Bằng phương pháp hóa học, hãy nhận biết các dung dịch mất nhãn sau:

HCl, NaCl, AgNO₃, BaCl₂, KI chỉ dùng 1 thuốc thử duy nhất.