Đáp án:
Giải thích các bước giải:
Cách 1: Fe + 2HCl-->FeCl2+H2↑
Cách 2: FeSO4 + BaCl2-->FeCl2+BaSO4↓
Cách 3 FeCl3+ Na2S-->2FeCl2+NaCl+S
chúc bạn học tốt
Điều chế $FeCl_2$ từ $Fe$
$Fe+2HCl→FeCl_2+H_2$
Điều chế $FeCl_2$ từ $FeSO_4$
$FeSO_4+BaCl_2→BaSO_4↓+FeCl_2$
Điều chế $FeCl_2$ từ $FeCl_3$
$2FeCl_2+Cl_2→2FeCl_3$
V. Give the right forms of the verbs in brackets: Simple future or Simple present, Present perfect or Future perfect. 1. I'll wait until he (finish)……………… his novel. 2. When you (came) ………………….back, he already (buy)……………….. a new house. 3. Don't come until I (finish)……………… lunch. 4. I (hope) it (stop)……………….. raining by 5 o'clock this afternoon. 5. The river (not begin) ……………to swell until some rain (fall)……………….. 6. By next month I (leave)………………… for India. 7. The film (end)…………………. by the time we (get) ………………..there. 8. They (build) ……………..a house by June next year. 9. We (start)…………………. our plan next week. 10. I (give) …………………her your letter when I (see) ………………..her tomorrow.
Bài 4 thôi ah cần gấp trong 5p => đề: cho MN/PQ = 4/7 bt MN= 8cm. PQ =?
giúp mik nhanh nhé mik đang cần gấp
Viết lại câu nhưng nghĩa vẫn vậy : 1. I like playing badminton - I am .... 2. She loves reading books -Her ..... 3. Do you like watching TV ? Are you ..... 4. They don't enfoy skating They aren't ..... 5 . Does your father like fishing ? Is .... Nhanh hộ mình nhé !!!
IV Give the right forms of the verbs in brackets: Simple future or Simple present. 1. We'll go out when the rain (stop)……………….. 2. I (stay) …………………here until he (answer)……………….. me. 3. Wait until I (catch) ………………..you. 4. She (not come) ……………………….until you (be)…………………… ready. 5. Miss Helen (help) ……………you as soon as she (finish)……………… that letter tomorrow. 6. After the class (be) …………………..over, ask the teacher about that sentence. 7. I (come) ………………….and (see)……………….. you before I leave here. 8. We (go)………………………… home as soon as we have finished our work. 9. I (wait) ………………….here until you (come) …………………..back tomorrow. 10. I (send) ………………..you some postcards as soon as I (arrive)………………. in London.
làm ơn giúp mình , mình sẽ đánh giá 5 sao và cảm ơn , cho tất cả các bạn trả lời hay nhất
. They (clean) the beach one week ago. . 2. They (collect) hundreds of books so far. . 3. I (collect) stamps when I was a child. . 4. She (fly) to Da Nang many times but last year she (go) there by train. . 5. You ever (see) a real lion? No, but I (see) a real elephant when we went to the zoo last month. .
IIIGive the right forms of the verbs in brackets: Past tenses. 1. Yesterday John (go)……………… to the store before he (go)………………… home. 2. Our teacher (tell)……………….. us yesterday that he (visit)…………… England in 1970. 3. When John and I got to the theatre, the movie (start) …………………already. 4. Before Alice (go)…………………….. to sleep, she (call)……………….. her family. 5. When the phone (ring)……………………., I (have) …………………dinner. 6. Daisy (agree) …………………..with other members in the last meeting. 7. What you (do)…………………. at 6 p.m yesterday? 8. The little girl asked what (happen) …………………to her ice-cream. 9. He (teach) ………………in this school before he (leave) …………….for England. 10. She (win)………………. the gold medal in 1986.
Helppppppppppppppppppppppppppppp
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