user-avatar
huynhtuankiet091106
2 năm trước
Sản xuất vôi được tiến hành qua hai công đoạn chính. Đá vôi (thành phần chính là chất canxi cacbonat) được đập thành cục nhỏ tương đối đều bằng nhau. Sau đó đá vôi được xếp vào lò nung nóng thì thu được vôi sống (chất canxi oxit), và khí cacbon đioxit thoát ra. Hãy phân tích và chỉ ra ở giai đoạn nào diễn ra hiện tượng vật lí, giai đoạn nào diễn ra hiện tượng hóa học. Giải thích
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. We ………(go) to a concert last night. 2. He ………(leave) three days ago. 3. They ………..(sell) their house this morning. 4. I ………….(get) up early this morning. 5. I …………..(watch) TV last night. 6. My sister …………….(not/ buy) the car yesterday afternoon. 7. Yesterday morning, the alarm went off and I …................ (get) up and then ………(go) down to the kitchen. 8. Jane ……………. (see) Lan’s brother a month ago in London. 9. What ……… you ……………(do) last night? - I ……………(write) a letter and then ……………(do) my homework. 10. When we …………..(arrive) at the bus stop, the bus …………….(already/ start). 11. I …………………(worry) a lot before I heard from my beloved aunt. 12. We ……………..(drink) a small cup of tea after we ………....(finish) breakfast. 13. Tom ……………………..(just/ go) out when I …………….(call) at his home. 14. The hostess ………..……be sure that she …………………..(see) the thief before. 15. When I ……………(reach) the station, the train …………(already/leave). 16. As soon as the children ……………... (finish) their breakfast , they ……...(run) out to play. 17. The sun ……………..(set) before I……..…… (be) ready to go. 18. He ……………. (learn) a lot of English before he ………..(go ) to England. 19. He …………….(thank) me for what I …………….(do) for his parents. 20. When we ……………….(come) many guests ………….(arrive). Exercise 3: Put the verbs into the correct tense of the verbs in brackets 1. Yesterday afternoon Anna (go)………..………….to the station to meet her friend. When She(get)……………….. there, her friend (already/ wait) …………………. for her. The train (arrive) ………………………. early. 2. When I got home, Bill (lie) ……………………. on the sofa. The television was on, but he (not watch) ………………… it, he (fall) ………………… asleep and (snore) ………………… loudly. I (turn) ……………… the television off and just then he (wake) ………… up. 3. The end of the 21century, they ………………… (finish) building tall buildings in this area. 4. When you ………………… (come) to England this summer, please visit me. 5. When she ………… (arrive) at the station, the train ………… (leave). 6. He …………… (put) down the living room carpet at the moment. 7. I …………………. (not see) her for 20 years now. 8. He didn’t pass the exam. If he ………………… (study) harder, he (not fail) the exam. Mng giúp em đc khg ạ

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team