khi đốt quặng Fes2 tòn oxi thu được sắt 3 oxit và lưu huỳnh đi oxit .tính khối lượng sắt 3 oxit và thể tích khí lưu huỳnh đi oxit thu được ở đktc khi đốt 48g Fes2 cần gấp còn 10p vote 5 sao

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PART 4: WRITING 1. Make sentences using the words and phrases given. 1. Our / volunteer / in / communities / make / difference. 2. I / like / take / part / volunteer / work / because / I / think / it / useful / meaningful / society. 3. We / should / help / homeless / elderly / abandoned / children. 4. I / volunteer / for / five / years. 5. Last week / my class / volunteer / clean / streets. 6. I / feel / more / confident / after / participate / volunteer / work. 7. My brother / ever / donate / blood / three times / before. 8. Every year / we / collect / old / books / clothes / help / poor / children / mountainous areas. 2. Rewrite the sentences with the same meaning. 1. This is the first time I have seen him. → I have never 2. I started studying English 3 years ago. → I have 3. I haven't seen him since I left school. → I last 4. It started raining two days ago. → It has 5. I have never seen such a beautiful girl before. → She is 6. We have never had such a cold winter. → It is 7. The last time she kissed me was 5 months ago. → She hasn't 8. It is a long time since we last met. → We haven't 9. When did you have it? → How long ? 10. She started driving 1 month ago. → She has 3. Make sentences using the words and phrases given. 1. ever/ you/ work/ volunteer/ done/ have/ ? 2. you/ volunteer/ do/ to/ become/ a/ want/ ? 3. for/ raise/ Ha Noi/ fund/ we/ poor children/ in/ homeless/. 4. children/ education/ we/ provide/ for/ disabled/. 5. the/ better/ world/ responsibility/ take/ volunteers/ of/ a/ making/. 6. do/ can/ you/ how/ we/ children/ elderly/ help/ think/ ?