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1 tháng 8 2017
2) Although it rained hard yesterday, i went to school on time.
3) VTV3 has a lot of interesting programs.
4) Hoai is more intelligent than Minh.
5) What about going to the movies ?
6) Let's go to the cinema.
7) going to the cinema.
8) more beautifully than Tom does.
E
3 tháng 9 2018
1. Can you take me a photograph?
Do/Would you mind taking me a photograph?
2. Could you wait a moment, please?
Do/Would you mind waiting a moment?
3. Will you turn down the TV, please?
Do/Would you mind turning down the TV?
4. Please make some tea.
Do/Would you mind making some tea?
5. Could you lend me some money?
Do/Would you mind lending me some money?
6. Will you post the letters for me?
Do/Would you mind posting the letter for me?
VII. Use “Would/ Do you mind if …?” to make the following sentences more polite.
1. Can I move the refrigerator to the right corner?
Would you mind if I moved the refrigerator to the right corner?
2. Could I smoke?
Do you mind if I some?
3. May I ask you a question?
Would you mind if I asked you a question?
4. Could I turn the air conditioner off?
Would you mind if I turned the air conditioner off?
5. Can I use your handphone?
Do you mind if I use your handphone?
6. Shall I carry your luggage?
Would you mind if I carried you luggage?
7. Could I borrow your newspaper?
Do you mind if I borrow your newspaper?
8. Shall I drive?
Would you mind if I drove?
VIII. Combine each pair of sentences, using present participle (V-ing) or past participle (V3/V-ed).
1. The baby is crying for her mother. She is sitting in an armchair.
The baby is crying for her mother sitting in an armchair.
2. The boy was taken to the hospital. He was injured in the accident.
The boy injured in the accident was taken to the hospital.
3. The road is very narrow. It joins the two villages.
The road joining the two vilages is very narrow.
4. Do you know the woman? The woman is talking to Tom.
Do you know the woman talking to Tom?
5. The window has been repaired. It was broken last night.
The window broken last night has been repaired.
6. The taxi broke down. It was taking us to the airport.
The taxi taking us to the airport broke down.
7. A bridge has been declared unsafe. It was built only two years ago.
A bridge built two years ago has been declared unsafe
8. Most of the goods are exported. They are made in this factory.
Most of the goods made in this factory are exported.
9. A new factory has just opened in the town. The factory employs 500 people.
A new factory employing 500 people has just opened in the town.
10. “Romeo and Juliet” is the best tragedy I have ever seen. It was written by Shakespeare.
“Romeo and Juliet” written by Shakespeare is the best tragedy I have ever seen.
MT
1 tháng 12 2017
câu 1
\(m_{H2O}=D.V=36.1=36\left(g\right)\)
\(n_{H_2O}=\dfrac{36}{18}=2\left(mol\right)\)
số phân tử H2O : \(2.6.10^{23}=12.10^{23}\)
câu 2
\(n_{CO_2}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)
\(m_{CO_2}=0,25.44=11\left(g\right)\)
\(V_{CO_2}=0,25.22,4=5,6\left(l\right)\)
1 tháng 12 2017
1,\(m_{H_2O}=D.V=36\left(g\right)\)
\(n_{H_2O}=\dfrac{36}{18}=2\left(mol\right)\)
\(SPT_{H_2O}=2.6.10^{23}=12.10^{23}\)
2,\(_{^nCO_2=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)}\)
\(m_{CO_2=0,25.44=11\left(g\right)}\)
\(V_{CO_2\left(đktc\right)}=0,25.22,4\)
HD
17 tháng 4 2019
hoàn thành phương trình hóa học và caan bằng
3Fe+ 2O2 --->.....Fe3O4.....
2H2 + ..........O2...........--->2H2O
H2O+Na2O------>........2NaOH........
4P+5O2---->........2P2O5.........
H2+........CuO....--->Cu+.....H2O......
H2O+SO2--->....H2SO3.....
......4Na........+.........O2..........--->2Na2O
Zn+HCL--->..............ZnCl2.............+......H2.........
........P2O5............+........3H2O...............-->2H3PO4
............S.........+..............O2........--->SO2
2Al+.......6HCl...............-->.....2AlCl3........+ 3H2
2H2O+Ca --->.......Ca(OH)2......+.........H2........
2KCLO3--->......2KCl.........+........3O2.......
2Al+6HCL--->........2AlCl3........+.......3H2.........
2KMNO4--->..K2MnO4....+....MnO2...+...O2......
Fe+H2SO4--->....FeSO4......+.....H2......
...Fe...+...HCl.....--->FeCL2+H2
2H2O+2Na--->........2NaOH.....+.............H2.......
17 tháng 4 2019
3Fe+ 2O2 --->Fe3O4
2H2 + O2 \(\underrightarrow{t^o}\) 2H2O
H2O + Na2O \(\rightarrow\) 2NaOH
4P+5O2\(\underrightarrow{t^o}\)2P2O5
H2+CuO\(\underrightarrow{t^o}\)Cu+H2O
H2O+SO2\(\rightarrow\)H2SO3
4Na+O2\(\underrightarrow{t^o}\)2Na2O
Zn+2HCl\(\rightarrow\)NaCl+H2
P2O5 +3 H2O\(\rightarrow\)2H3PO4
S+O2\(\underrightarrow{t^o}\)SO2
Al+HCl\(\rightarrow\)AlCl3+H2
2H2O+Ca\(\rightarrow\)Ca(OH)2+H2\(\uparrow\)
2KCLO3\(\underrightarrow{t^o}\) 2KCl + 3O2\(\uparrow\)
2Al+6HCl\(\rightarrow\)2AlCl3 + 3H2\(\uparrow\)
2KMNO4\(\underrightarrow{t^o}\)K2MnO4 + MnO2 + O2\(\uparrow\)
Fe+H2SO4\(\rightarrow\)FeSO4 + H2\(\uparrow\)
Fe + 2HCl\(\rightarrow\)FeCl2+H2\(\uparrow\)
2H2O+2Na\(\rightarrow\)2NaOH + H2\(\uparrow\)
HD
17 tháng 4 2019
viết phương trình theo chuỗi chuyển hóa
Na---->Na20--->NaOH
\(4Na+O_2\underrightarrow{t^0}2Na_2O\)
\(Na_2O+H_2O\rightarrow2NaOH\)
KMnO4---->O2--->Fe3O4--->Fe
\(2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\)
\(2O_2+3Fe\underrightarrow{t^0}Fe_3O_4\)
\(Fe_3O_4+4H_2\underrightarrow{t^0}3Fe+4H_2O\)
S--->SO2---->H2SO3
\(S+O_2\underrightarrow{t^0}SO_2\)
\(SO_2+H_2O\rightarrow H_2SO_3\)
K--->K2O--->KOH--->
\(K+O_2\underrightarrow{t^0}K_2O\)
\(K_2O+H_2O\rightarrow2KOH\)
P--->P2O5---->H3PO4
\(4P+5O_2\underrightarrow{t^0}2P_2O_5\)
\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
Cu--->CuO--->Cu
\(Cu+O_2\underrightarrow{t^0}2CuO\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
TP
12 tháng 4 2020
Mg + 2HCl -----> MgCl2 + H2
3Fe + 2O2 ----to------->Fe3O4
2KMnO4 ----to-------> K2MnO4 + MnO2 + O2
2Al + 3H2SO4 --------> Al2(SO4)3+ 3H2
P2O5 +3H2O -----> 2H3PO4
2H2 +O2 ----to------->H2O
CaCO3 ----to-------> CaO + CO2
2H2O -------điện phân----> 2H2 + O2
Zn+ H2SO4 --------> ZnSO4 + H2
4Na+ O2 ---------->2 Na2O
23 tháng 4 2017
1, PbO + H2 ->(nhiệt độ ) Pb + H2O
2H2O -> ( điện phân ) 2H2 + O2
5O2 + 4P ->(nung nóng) 2P2O5
P2O5 + 3H2O -> 2H3PO4
23 tháng 4 2017
2, 2H2 + O2 -> (nung nóng) 2H2O
K2O + H2O -> 2KOH
KOH + HCl -> KCl + H2O
Taro is not interested in reading books.
Taro is not interested in reading books
HT nha bạn