cho các kim loại : Mg, Cu, Na, Al a, Những kim loại nào trên đây, trong thực tế được sử dụng làm dây dẫn điện? b, Sắp xếp các kim loại trên theo chiều tăng dần mức độ hoạt động hóa học và chứng minh c, Cho dd chứa hỗn hợp CuSO4 và MgSO4 dùng kim loại nào trong 4 kim loại trên để thu được dd chỉ chứa MgSO4? Viết PTHH của phản ứng xảy ra

câu 2: Nêu hiện tượng quan sát được và viết PTHH xảy ra, ghi rõ điều kiện phản ứng (nếu có)
a, Cho mẫu sắt vào ống nghiệm chứa dd HCl (dư)
b, Cho từ từ dd BaCL2 vào ống nghiệm chứa dd H2SO4
c, Cho đinh sắt vào ống nghiệm chứa dd CuSO4
d, Cho dd NaOH tư từ vào ống nghiệm chứa dd CuSO4
e, Đốt nóng đỏ một đoạn dây sắt rồi cho vào bình chứa khí oxi
f, Đốt sắt trong khí Clo

II/ VERB FORMS
11. They____table tennis when their father comes back home (will play/will be playing/play/would play)
12. By Christmas, I_____for Mr.Smith for six years (will have been working/will work/have been working/will be working)
13. I____in the room right now (am being/was being/have been being/am)
14 I_____to New York three times this year (have been/was/were/had been)
15 I'll come and see you before I____for the States (leave/will leave/have left/shall leave)
16 The little girl asked what___to her friend (has happened/happened/had happened/would have been happened)
17 John____a book when I saw him (is reading/read/was reading/reading)
18 He said he____return later (will/would/can/would be)
19 Jack____the door (has just opened/open/have opened /opening)
20 I have been waiting for you____ (since early morning/since 9 a.m/for two hours/all are correct)

II/ VERB FORMS
11. They____table tennis when their father comes back home (will play/will be playing/play/would play)
12. By Christmas, I_____for Mr.Smith for six years (will have been working/will work/have been working/will be working)
13. I____in the room right now (am being/was being/have been being/am)
14 I_____to New York three times this year (have been/was/were/had been)
15 I'll come and see you before I____for the States (leave/will leave/have left/shall leave)
16 The little girl asked what___to her friend (has happened/happened/had happened/would have been happened)
17 John____a book when I saw him (is reading/read/was reading/reading)
18 He said he____return later (will/would/can/would be)
19 Jack____the door (has just opened/open/have opened /opening)
20 I have been waiting for you____ (since early morning/since 9 a.m/for two hours/all are correct)

I/ WORD FORMS
1. I like the_____of living close to work (convenient)
2 I wish there were no_____in my family (violet)
3 Children rarely show any____of what their parents do for them (appreciate)
4 _____people whom we weren't expecting turned up at the meeting (variety)
5 It's a adition in VN that the juniors have to____the seniors (OBEDIENT: VÂNG LỜI)
6 Last week we had a____surrvey (fascinate)
7 Can you say something about the____off the Perfume Pagoda? (beautiful)
8 My sister is going to get____at weekend (marriage)
9 An_____family includes several generations living together in the same house (EXTEND)
10 I'm____because I have just received a birthday present (delight)
11 The company needs more____assistance from the government (finance)
12 Many important____documents were destroyed when the library was bombed (history)

rút gọn biểu thức căn 10 - căn 2/căn 5 - 1 + 2 - căn 2/căn 2 - 1

rút gọn biểu thức 1/căn 5 - căn 3 - 1/căn 5 + căn 3

24 My family (live on/pass down/come back) gardening in the countryside p
25 Last month my father (weave/wove/weaves) a small basket for me
26 The villagers (made/had made/have made) pottery for about for 100 years
27 France is a (cosmopolitan/forbidden/multicultural) country
28 He was born and grew (on/in/up) in the countryside
29 They will (live on/pass down/come back) home village next week
30 We started to learn how to (mould/weave/cast) a basket
31 He (carved/embroidered/knitted) frowers on the wooden armchairs
32 (After/since/although) we had eaten lunch, we went to Han market to buy some souvenirs
33 You should take your shoes (up/in/off) when you go into the temples
34 Find the words which has a different sound in the part underlined (fabulous/handicraft/frame)

24 My family (live on/pass down/come back) gardening in the countryside p
25 Last month my father (weave/wove/weaves) a small basket for me
26 The villagers (made/had made/have made) pottery for about for 100 years
27 France is a (cosmopolitan/forbidden/multicultural) country
28 He was born and grew (on/in/up) in the countryside
29 They will (live on/pass down/come back) home village next week
30 We started to learn how to (mould/weave/cast) a basket
31 He (carved/embroidered/knitted) frowers on the wooden armchairs
32 (After/since/although) we had eaten lunch, we went to Han market to buy some souvenirs
33 You should take your shoes (up/in/off) when you go into the temples
34 Find the words which has a different sound in the part underlined (fabulous/handicraft/frame)

13 I've won an essay contest. - (Congratulations!/ It's interesting/Oh poor!)
14 Physical changes are different for every, so you don't need to feel embarrased or (frustrated/tense/confident)
15 Would you like to go to the cinema? (how cool!/sure/ I can't imagine that)
16 The doll has been (embroidered/cast/woven/mounded) out of clay
17 We invited her to the party but she (set up/turned down/pass down)
18 Choose the word which has a different stress pattern (contestant/remote/proper)
19 We can't decide (where/what/which) to go for our vacation
20 I couldn't concentrate on my lesson (although/so that/because) I was very tense
21 He started to learn how to (embroider/weave/cast) a statue in bronze
22 Hue's conical hats always have two (layers/frames/poems) of leaves
23 These cars are (lots smaller/much smaller/more smaller) than those ones