Giải thích các bước giải:
\(\begin{array}{l}a)Zn + 2HCl \to ZnC{l_2} + {H_2}\\b)\\{n_{Zn}} = 0,4mol\\ \to {n_{HCl}} = 2{n_{Zn}} = 0,8mol\\ \to {m_{HCl}} = 0,8 \times 36,5 = 29,2g\\ \to {m_{{\rm{dd}}HCl}} = \dfrac{{29,2 \times 100\% }}{{7,3\% }} = 400g\\c)\\{H_2} + CuO \to Cu + {H_2}O\\{n_{{H_2}}} = {n_{Zn}} = 0,4mol\\ \to {n_{Cu}} = {n_{{H_2}}} = 0,4mol\\ \to {m_{Cu}} = 0,4 \times 64 = 25,6g\end{array}\)
`a)``Zn+2HCl->ZnCl_2+H_2`
`b)``n_{Zn}=(26)/65=0,4mol`
`n_{HCl}=2.0,4=0,8mol`
`mdd_{HCl}=(0,8.36,5)/(7,3%)=400g`
`c)``H_2+CuO->Cu+H_2O`
`n_{H_2}=n_{Zn}=0,4mol`
`n_{Cu}=n_{H_2}`
`m_{Cu}=0,4.64=25,6g`
II. Choose the best word or phrase to complete each of the following sentences by circling the letter A, B, C or D. (1.5 points) 1. Let’s ______ (to play/ playing/ play/ played) soccer. 2. I wish I ______ (can/ wouldn’t/ can’t/ could) sing English well. 3. We should turn ______ (on/ to/ off/ down) the lights when we are out. 4. She suggests ______ (walking/ walked/ walk/ have walk) to school. 5. The librarian asked us ______ (not to make/ nomake/ not making/ don't make) so much noise. 6. I really enjoy the disco. It was great, ______ (isn't it/ is it/ wasn't it/ weren't it) ? 7. We have lived in this flat _____ (ago/ for/ since/ already) five years. 8. What is the name of the man ______ (who/ whose/ whom/ which) gave us a gift. 9. This monument ______ (has been built/ was built/ has built/ is built) in the 17th century. 10. He seldom goes to the market, _____(don’t you/ does he/ doesn’t he)? 11. He ______ (tried hard/ tried hardly/ hardly tried/ try hardly) to find a job, but he had no luck. 12. Mothers are always _______(protect/ protective/ protected/ protections) towards their children, aren’t they? 13. The beautiful village is sheltered _____(from/ by/ in/ of) the weather by the mountain. 14. It is a ______(polyester sleeping blue bag/ blue sleeping polyester bag/ blue polyester sleeping bag / sleeping blue polyester bag) 15. I suggest the room ______(be decorated/ is decorated/ were decorated/ should decorate) before Christmas. III. Choose the words or phrases that are not correct in standard English, then correct them. (1.0 point) 0. I wish you can help me solve this mathematical problem. A B C D 1. On the trip to Vietnam, Maryam was impressed by the friendly of A B C people in Hanoi. D 2. Lion King is one of the most interesting cartoon I have ever seen. A B C D 3. I enjoyed listening to traditional music and go dancing with my A B C D friends. 4. I haven’t heard from Susan since a long time. A B C D 5. She wishes she will go to the party with her sister tomorrow. A B C D 0. 1. ________________ 2. ________________ 3. ________________ 4. ________________ 5. ________________ IV. Use the correct form of the word given to complete each sentence. 1. The Great pyramid of Giza is one of the seven …………………….. of the ancient world. WONDERFUL 2. Scientists estimate that the world ……….………...….. will double in ten year' time. POPULATE 3. My favorite form of …………………… is playing the guitar. ENTERTAIN 4. ………..…….., the typhoon didn’t cause any damage on the village. LUCKY 5. AIDS is a ……………………. disease. DANGER
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