1. s_a_ _ e_ er
2. r_ _ _ _
3. _ _ m_ _ _s
4._ i _ _ _ le
5. n_ _ e _ _ _ _
6. d _ _ _
7. _ _ _ c_ _ _ _ _ r
8. t _ _ _ _ o _ _
Exercise 1: Look and complete
1. r_ _d a m_ _ _z_ _e 2. m_ _ _c_ _ _s
3. _ _ _ y b_ _ _ _ _ b_ll 4. W_ _ _h ca_ _ _ _ _s
5. _ _ _ w pi_ _ _ res 6. I _ _ _ en to m_ _ _ _
7. p_ _ y c_ _ _ uter g_ _ es 8. G_ fi_ _ _ _g
9. b_ _ _ d sa_ _ _ _ _ _ _ _s 10. g_ c_ _ _ _ng
1. read a magazine
3. play basketball
5. draw pictures
6. listen to music
7. play computer games
8. go fishing
10. go cycling
9. build sandcastles
1,read a magazine
2, chịu ko bt
3,play basketball
4,watch cartoon
5,draw pictures
6,I listen to music
7,play computer games
8,go fishing
9,buld sandcastles
10,go camping
I.Em hãy chọn các chữ cái thích hợp để điền vào chôc trống sau để hoàn thành từ có nghĩa:
1.T_ _L_E
2._V_N_ _G
3.T_ _N_S
4.C_ _L_R_
5.F_ _T_ E_
6.C_ _S_M_T_
7.H_ _LO
8._R_ _T_N_
9.N_ _H_
10._ _M_B_R
1.TABLE
2.EVENING
3.TENNIS
4.CHILDREN
5.FATHER
6.CLASSMATE
7.HELO
8._R_T_N_
9.NIGHT
10.MEMBER
1. E_ _ l_ _ _.
2. H_ _ _w_ _ _
3. L _ _ _h
4. S_ _ r_ _
5. b_ _ m _ _ _ _ n
6. p_ _ s _ _ _
7. l_ _ _ o _
8.j_ _ _
1. ENGLISH
2.HOMEWORK
3. LUNCH
4. SPORTY
5. BADMINTON
6. LESSON
7. JUDO
1. En g li s h.
2. H o u swork
3. L uch
4. Spo rty
5. ba d m into n
6. pea s son
7. less o n
8.ju do
Khó wak vậy! Đoán dc pao nhiêu thuj!
1. ENGLISH
2. HOUSEWIFE
4. SORROW
5. BADMINTON
7. LESSON
1. r_ _d a m_ _ _z_ _e
2.m_ _ _c_ _ _s
Giúp mik
Câu 6: Phân loại và gọi tên các oxit sau: Fe\(_2\)O\(_3\), SO\(_3\), N\(_2\)O\(_5\), Na\(_2\)O, P\(_2\)Os, FeO, CO\(_2\),
CuO, Mn\(_2\)0\(_7\), SO\(_2\), HgO, PbO, Ag\(_2\)0.
sao ko tự làm mấy này được vậy , thử tự làm cái nào ko bt hẵng hỏi mất gốc luôn đấy nếu cứ hỏi suốt như vạy
Fe2O3: oxit bazơ: sắt (III) oxit
SO3: oxit axit: lưu huỳnh trioxit
N2O5: oxit axit: đinitơ pentaoxit
Na2O: oxit bazơ: natri oxit
P2O5: oxit axit: điphotpho pentaoxit
FeO: oxit bazơ: sắt (II) oxit
CO2: oxit axit: cacbon đioxit
CuO: oxit bazơ: đồng (II) oxit
Mn2O7: oxit axit: mangan (VII) oxit
SO2: oxit axit: lưu huỳnh đioxit
HgO: oxit bazơ: thủy ngân (II) oxit
PbO: oxit bazơ: chì (II) oxit
Ag2O: oxit bazơ: bạc oxit
Fe2O3: Sắt (III) oxit - oxit bazơ
SO3: Lưu huỳnh trioxit - oxit axit
N2O5: đinitơ pentaoxit - oxit axit
Na2O: Natri oxit - oxit bazơ
P2O5: điphotpho pentaoxit - oxit axit
FeO: Sắt (II) oxit - oxit bazơ
CO2: cacbon đioxit - oxit axit
CuO: đồng (II) oxit - oxit bazơ
Mn2O7: mangan (VII) oxit - oxit axit
SO2: Lưu huỳnh đioxit - oxit axit
HgO: Thủy ngân (II) oxit - oxit bazơ
PbO: Chì (II) oxit - oxit bazơ
Ag2O: Bạc oxit - oxit bazơ
1. Open your e_ _s and look!
2. He's got his little granddaughter on his sh_ _ _ _ _ _s.
3. She can dance well. Look at her f_ _t!
4. I can't eat any more. My s_ _ _ _ _h is full!
5. I can't move my head. I've got a bad n_ _k.
Điền từ còn thiếu vào chỗ trống:
1. I injured my leg ten minutes before the end of the game, but I m_ _ _ _ _ _ to keep playing ( cần điền thêm 6 chữ)
2. While he's been in hospital, I've been looking a_ _ _ _ his dog ( cần điền thêm 4 chữ)
3. I'm sorry, but you have to be a m_ _ _ _ _ of the golf club to play here ( cần điền thêm 6 chữ)
4. You became ill because the fish wasn't c_ _ _ _ _ properly( cần điền thêm 5 chữ)
5. His brother was a_ _ _ _ to start the engine whenhe noticed a smell of petrol ( cần điền thêm 4 chữ)
6. To deal with climate change we need to use sources of r_ _ _ _ _ _ _ _ energy ( cần điền thêm 8 chữ)
7. She's going to h_ _ _ in her notice tomorrow because she's got a new job ( cần điền thêm 3 chữ)
8. His working style is s_ _ _ _ _ _ to that of most other workers ( cần điền thêm 6 chữ)
Điền từ còn thiếu vào chỗ trống:
1. I injured my leg ten minutes before the end of the game, but I managed to keep playing ( cần điền thêm 6 chữ)
manage to do something : có thể xoay sở để làm được việc gì đó
2. While he's been in hospital, I've been looking after his dog ( cần điền thêm 4 chữ)
look after = take care of : chăm sóc, trông nom
3. I'm sorry, but you have to be a member of the golf club to play here ( cần điền thêm 6 chữ)
4. You became ill because the fish wasn't caught properly( cần điền thêm 5 chữ)
6. To deal with climate change we need to use sources of renewable energy ( cần điền thêm 8 chữ)
7. She's going to hand in her notice tomorrow because she's got a new job ( cần điền thêm 3 chữ)
to hand in one’s notice : nộp đơn xin việc/từ chức cho ai
8. His working style is similar to that of most other workers ( cần điền thêm 6 chữ)
1. Managed
2. After
3. Master
5. Able
6. Renewable
7. Heed ( not sure )
Bổ sung:
7. She's going to hold in her notice tomorrow because she's got a new job.
8. His working style is similar to that of most other workers.
1.He often lets me use his m_ _ _ _ e phone.
2.That's great! Are you e_ _ _ _ _ d?
3.V_ _ _ _ _ _ s eat the local dishes because they love the way they smell
4.Which hotel are you s_ _ _ _ _g at?
1.He often lets me use his mobile phone.
2.That's great! Are you excited?
4.Which hotel are you staying at?
Đề:
Đốt cháy hỗn hợp bột Al và bột Mg, trong đó bột Al là 2,7 g cần tổng cộng 3,36 l khí O2 (đktc). Hỏi thành phần phần trăm mỗi kim loại trong hỗn hợp ban đầu?
Tóm tắt:
MMg = 24 g/mol
MAl = 27 g/mol
mAl = 2,7 g
\(V_{O_2}=3,36l\left(\text{đ}ktc\right)\)
________________
% mAl = ? (%)
% mMg = ? (%)
Giải:
\(n_{Al}=\frac{m_{Al}}{M_{Al}}=\frac{2,7}{27}=0,1\left(mol\right)\)
\(n_{O_2}=\frac{V_{O_2}}{22,4}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
PTTH (1): \(4Al+3O_2\rightarrow2Al_2O_3\)
4 mol 3 mol 2 mol
0,1 mol 0,075 mol 0,05 mol
\(n_{O_2}\left(p.\text{ứ}.2\right)=n_{O_2}\left(\text{đ}\text{ề}\right)-n_{O_2}\left(p.\text{ứ}.1\right)=0,15-0,075=0,075\left(mol\right)\)
PTTH (2): \(2Mg+O_2\rightarrow2MgO\)
2 mol 1 mol 2 mol
0,15 mol 0,075 mol 0,15 mol
\(m_{Mg}=n_{Mg}\times M_{Mg}=0,15\times24=3,6\left(g\right)\)
\(m_{hh}=m_{Al}+m_{Mg}=2,7+3,6=6,3\left(g\right)\)
\(\%m_{Al}=\frac{m_{Al}}{m_{hh}}\times100\%=\frac{2,7}{6,3}\times100\%\approx42,86\%\)
\(\%m_{Mg}=100\%-\%m_{Al}=100\%-42,86\%=57,14\%\)
Trịnh Trân Trân <3