Bài 3: Một hợp chất khí có thành phần phần trăm theo khối lượng là 82,35% N và 17,65% H. Em hãy cho biết:
a) Công thức hoá học của hợp chất. Biết hợp chất này có tỉ khối đối với khí hiđro là 8,5.
b) Số mol nguyên tử của các nguyên tố có trong 0,5 mol hợp chất.
Bài 2: Lập phương trình hóa học cho mỗi phản ứng sau:
a. Al + CuO — — — > Al2O3 + Cu
…………………………………………………………………………………..
b. BaCl2 + AgNO3 — — — > AgCl + Ba(OH)2
…………………………………………………………………………………………………………………………………..
c. Fe + Br2 — — — > FeBr3
………………………………………………………………………………….
d. Fe(OH)3 — — — > Fe2O3 + H2O
…………………………………………………………………………………
Bài 1: Viết công thức hóa học và tính phân tử khối của các hợp chất sau:
a. Natri nitrat, biết trong phân tử có 1Na, 1N và 3O
CTHH: ……………………..PTK = ……………………………………………….
b. Nhômi phopat, biết trong phân tử có 1Al, 1P và 4O
CTHH: ………………………PTK = ………………………………………………
Bài 3: Sử dụng tính từ đuôi “ed” hoặc “-ing” tạo thành từ những động từ trong ngoặc để hoàn thành những câu dưới đây.
1. The kitchen was in a_______________ state when she left. ( disgust)
2. Jim had an accident yesterday and his situation is _______________. (worry)
3. The result of her exam is very _______________. ( disappoint)
4. This is the most_______________ film I have known. (thrill)
5. Everyone was _______________ at her new hair. (surprise)
6. I really got _______________ at the lack of progress. (frustrate)
7. What is the most _______________ creature in the world? (frighten)
8. It is absolutely a visually _______________ movie. (stun)
9. Jane gave up her part-time job because it was too _______________(exhaust)
10. The rainforests are disappearing at an _______________ rate. (alarm)
11. They are never_______________. They are always complaining. (satisfy)
12. My teacher was very _______________that I studied hard. (please)
13. I am _______________ to know your thought of the movie. (intrigue)
14. Your remarks are_______________. You should apologize. (insult)
15. I was deeply _______________ by the news. (disturb)
16. It was _______________ outside. You should put on thick coat before going out. (freeze)
17. My parents always give me a warm_______________ hug whenever I get home. (welcome)
18. Students easily get _______________. (distract)
19. I find his argument very _______________. (convince)
20. Jane appeared _______________ and confident before the interview. ( relax)
Bài 2: Khoanh tròn vào đáp án đúng.
1. Are you (interested/ interesting) in classical music?
2. I always feel (exhausted/ exhausting) after long working hours.
3. The movie I saw last night was (excited/ exciting).
4. I find it (astonished/astonishing) you didn’t like sci-fi movies.
5. My sister easily gets (embarrassed/ embarrassing).
6. Tom, you look (tired/ tiring). What have you done?
7. I think all my teachers are (amazed/ amazing). I love them very much.
8. Last week, my father threw a (surprised/ surprising) party to celebrate my birthday.
9. I didn’t find the jokes at all (amused/ amusing).
10. Last year, I had a really (terrified/ terrifying) experience at the camp site.
11. I never find reading books (bored/ boring).
12. His wife looked (astounded/astouding) at the news.
13. Ann was (thrilled/ thrilling) to bits that she got the job.
14. This complicated system really makes me (confusing/confused).
The film was terribly (disappointed/ disappointing).