Đáp án:
$nH_{2}=\frac{11,2}{22,4}=0,5$
$nHCl=2nH_{2}=0,5.2=1$
BTKL:
$mKL+mHCl=mMuối+mH_{2}$
⇔$mMuối=20+1.36,5-0,5.2$
⇔$mMuối=55,5g$
Giải thích các bước giải:
Đọc đoạn 2: “Huống chi … vui lòng” Em có nhận xét gì về cách dùng từ của tác giả? Những từ ngữ ấy đã nêu lên bản chất gì của giặc?
VI. Complete the sentences, using although, despite, in spite of, however, or nevertheless. Sometimes, two answers are possible. 1. I think I did OK in my speech last night ______________ I’d had almost no sleep for 24 hours. 2. ______________ I heard the telephone ring, I didn’t answer it. 3. We enjoyed our holiday_________________ the rain. 4. _______________ he got top marks at high school, he never went to university. 5. ______________ there was no electricity, I was able to read because I had a candle. 6. She failed the test _______________ she studied hard. 7. _______________ difficulties, the firemen managed to save many people who were caught in the fire. 8. Everyone thought she would accept the offer. __________________, she turned it down. 9. Carol arrived at the meeting ______________ I asked her not to be there. 10. It looks like they’re going to succeed ______________ their present difficulties. 11. ______________ it was raining heavily, he went out without a raincoat. 12. My father is very busy. ______________ , he is always willing to give a hand with the housework. 13. The sky was grey and cloudy. ______________, we went to the beach. 14. Some English words have the same pronunciation ______________ they are spell differently, for example, dear and deer. 15. I was cold and wet ______________ .Bob put on his swimming suit and went to the beach. VII. Complete the text with the words given in the box. thriller actors director star favourite role scene extras My (1) __________________ film this year was Zero Game, the latest (2) __________________ by (3) _________________ Xi Dong. It has several well-known Chinese (4) ________________ and one real (5) _______________, Li Mu Bai, who plays the (6) ___________________ of the policeman who has to catch a thief, Jun Fat. Li Mu Bai is brilliant. In the best (7) ____________, he chases Jun Fat across the city on a motorbike, watched by thousands of (8) ______________. VIII. Complete the conversation with the words in the box. interested cinema films fantastic relaxed amazing successful section boring awards 1. I am very _______________ in watching TV late on Saturday evenings. 2. His film has won a lot of _______________. 3. All the critics said the film was really _______________. Nevertheless, I was so interested that I saw it from beginning to end. 4. Avatar is a big hit – the special effects are _______________. 5. If you want to know which films are on the cinemas, you should look at the film _______________ of this magazine. 6. I feel very _______________ when I see romantic comedy. 7. Spiderman 2 has a lot of _______________ action scenes. 8. Have you ever been to the _______________ lately? 9. What type of _______________ do you like, Nick? 10. Kristen Dunst’s most _______________ films are the Spiderman films. IX. Complete the conversation with the words in the box. film drama comedy musical romance horror western action science-fiction animated 1. I love _____________________films. They’re very exciting. 2. Have you ever seen this _____________________. It’s really funny. 3. There are always cowboys in a _____________________. 4. A _____________________.is a play in a theatre or on television or radio, or plays and acting generally. 5. Dracula is the best _____________________ film I’ve ever seen. 6. We are going to the cinema to see a _____________________. 7. My favourite _____________________ films have beings from Mars. 8. I watched this _____________________ last week. The singing and dancing are great. 9. The Lion King is an excellent ________________ film. I love cartoons. X. Complete the conversation with the correct form of the adjectives in brackets. 1. A: Was it a good film? B: No, it wasn’t very (interest) _____________. In fact, it was very (bore) _____________. 2. A: I’m always very (tire) ________________ after a day at work. I can’t do anything in the evening. B: Why don’t you watch a film? A: I always fall asleep. Sometimes, I put on the most (excite) ___________ film that I really want to see but I always fall asleep. 3. A: I’m an actor. Acting is a very (tire) _____________ job. It isn’t (relax)_____________ at all. Are you (relax) _______________? B: No way. I’m a worker. XI. Complete the sentences with the correct form of the adjectives in brackets. 1. I was very _______________ in the lesson because our teacher is very _______________ in history. (interest) 2. My friend is a very _______________ sort of person but he hates doing _______________ activities. (relax) 3. Studying for exams is very _______________ I get _______________ when I open my school books. (tire) 4. We were all very _______________ about the school trip but it wasn’t an _______________ trip at all. (excite) 5. It’s a _______________ book and I’m _______________ every time I start reading it (bore)
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