Đáp án:
Giải thích các bước giải:
4Cr+3O2-to>2Cr2O3
2Cr+3O2-to>2CrO3
Mn+O2-to>MnO2
2Zn+O2-to>2ZnO
2Mn+O2-to>2MnO
2Fe+3Cl2-to>2FeCl3
2Ca+O2->2CaO
2Cr + 3O2 -> 2Cr2O3
3Cr + 3O2 -> 3CrO3
Mn + O2 -> MnO2
2Zn + O2 -> 2ZnO
2Mn + O2 -> 2MnO
2Fe + 3Cl2 -> 2FeCl3
2Ca + O2 -> 2CaO
VII. Underline the correct words or phrases. 1. Cattle usually cross over the road. You should drive more careful / more carefully. 2. Life in some parts of the country is boring / more boring than that in other parts. 3. The old usually get up earlier / more early than the young. 4. An ox doesn’t plough weller / better than a buffalo. 5. These 7 thinking habits will help you become more confident / more confidently. 6. Don’t worry. The river is not as deep / deeper as it looks. 7. After a hard working day, you may sleep soundlier / more soundly than usual. 8. My father has been much healthier / more healthy since he stopped smoking. 9. The air in the mountainous zones is more fresh / fresher than that in the cities. 10. I can’t understand. Would you ask him to speak clearlier / more clearly?
Mọi người cho em hỏi 1 số bài thơ, ca dao nói về tình yêu thiên nhiên không nằm trong chương trình sgk với ạ..
Part I. Choose the word whose underlined part is pronounced differently from that of the others in each group then write your answers in the boxes given. 1. A. looked B. watched C. stopped D. carried 2. A. bath B. father C. theater D. health 3. A. danger B. angry C. language D. passage 4. A. children B. chance C. change D.mechanic 5. A. manure B. measure C. pasture D. adventure 6. A. deaf B. beat C. lead D. teach 7. A. selection B. island C. plastic D. sunny 8. A. laughs B. cars C. stops D. works 9. A. youth B. this C. with D. than 10.A. school B. chemistry C. mechanic D. stretcher
cần giải đáp với bài hơi khó hiểu
Hãy viết một bài văn về khoảnh khắc yêu thích nhất trong ngày của em (biểu cảm)
Vì sao băng lại nổi trên mặt nước?
giúp mình làm bài nha mọi người mình đang cần gấp
giup em giải chi tiết với ạ em cảm ơn
helplpppppppppppppppppppppppppppp
128. He last phoned his parents 3 months ago > He hasn’t ………………………….. > The last time ………………………………………………… > It is…………………………………………………………… 129. He usually took them to the park > He used ……………………….. > He doesn’t ………………………………………………… 130. Run fast or you will have a problem with him > If you don’t………………………….. 131. Stay up late and you will feel tired. > If you ………………………………………. 132. Unless he opens the door, I will come back home . > if he ……………………………. 133. Keep silent or our teacher will come here. > If you ………………………………….. 134. If it doesn’t rain tomorrrow, I will go out.> Unless it ………………………………….. 135. They last phoned us when we came here. > They haven’t ……………………………….. > The last time …………………………………. 136. Be quiet or the teacher will come here > If you………………………… 137. The lesson was too difficult for him to learn. The lesson …………………………………… The lesson was ………………………………….. It was ……………………………………….
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