Giai PT
a, sin 2x = -1
b,sin 3x+1 = 0
c, sin 7x= cos 5
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đây nha bn
1. informative
2. machiner
3. injury
4. appeared
5. please
6. experienced
7. succeeded
8. variety
nếu sai bỏ qua cho mik nhé
chúc bn hok tốt
1. informative
2. machiner
3. injury
4. appeared
5. please
6. experienced
7. succeeded
8. variety
Give the correct form of the word given in bracket:
1, We watch the news everyday because it's very ..........information................... INFORM
2, Mr Jone repairs machines in a factory. He is a ........machiner....................... MACHINE
3, Lan fell off the bike, but her ..........injury..................were not serious. INJURE
4, We couldn't see the airplane because it ........appeared.................. behind the cloud. APPEAR
5, l travelling by motorbike, but it's .....please...................... in bad weather. PLEASE
6, You'd better drive. I'm too ...........EXPERIENCED.................. for such complicated traffic. EXPERIENCE
7, Although he tried his best to do it, he was ............SUCCESSED.............. . SUCESS
8, There is a ..........variety.................. of food in this supermarket. VARY
My sister s badminton but she doesn’t play it very good.
=> well
You’d better taking off your wet overcoat and those muddy shoes before going home.
=> take
I’ll give you some medicine to make you to feel better.
=> X
Each student have to write a paragraph about the benefits of learning English
=> has
We will be there for about twenty – five minutes.
He was absent for work because of illness
=> the illness
Who is the good at Maths in your class?
=> X
You ought to not go out without a coat. It’s cold outside.
=> not to
The telephone sounds badly because of the bad weather.
=> bad
We are looking forward to hear from my mother in Singapore.
=> hearing
mk làm lại đây nhé:
My sister s badminton but she doesn’t play it very good.
=> well
You’d better taking off your wet overcoat and those muddy shoes before going home.
=> take
I’ll give you some medicine to make you to feel better.
=> X
Each student have to write a paragraph about the benefits of learning English
=> has
We will be there for about twenty – five minutes.
He was absent for work because of illness
=> the illness
Who is the good at Maths in your class?
=> X
You ought to not go out without a coat. It’s cold outside.
=> not to
The telephone sounds badly because of the bad weather.
=> bad
We are looking forward to hear from my mother in Singapore.
=> hearing
Trả lời :
\(NSF_3\) – Thiazyl triflorua
\(ClO\) – Clo monoxit
\(C_2N_2\) – Xyano
\(CO\) – Cacbon monoxit
\(NO\) – Nitric oxit
\(N_2O\) – Nitrơ oxit (khí bóng cười)
\(C_6H_6\) – Benzen
\(C_6H_5CN\) – Benzonitril
\(BeCl_2\) – Beri clorua
TÊN HOÁ CHẤT | CÔNG THỨC PHÂN TỬ | CÔNG THỨC CẤU TẠO |
Oxi | \(O_2\) | \(O=O\) |
Nitơ | \(N_2\) | \(N\equiv N\) |
Lưu huỳnh đioxit | \(SO_2\) | \(O=S\rightarrow O\) |
Cacbon đioxit | \(CO_2\) | \(O=C=O\) |
Ozon | \(O_3\) | \(O=O\rightarrow O\) |
Hiđro xyanua | \(HCN\) | \(H-C\equiv N\) |
Thiiran | \(C_2H_4S\) | H – C – C – H H H S |
Trả lời:
Khi cho kim loại kiềm vào dd axit thì kim loại kiềm sẽ phản ứng với H2O trước do các kim loại kiềm có tính khử mạnh.
~HT~
kim loại kiềm dư tác dụng với dung dịch axit thì phản ứng H2O trước nha bạn
K nha !
Mg + H2SO4 -------> MgSO4 + H2
MgSO4 + BaCl2 --------> MgCl2 + BaSO4
MgCl2 + 2KNO3 -------> 2KCl + Mg(NO3)2
Mg(NO3)2 + 2NaOH ------> Mg(OH)2 + 2NaNO3
Mg(OH)2 --------> MgO + H2O
MgO + H2SO4 -------> MgSO4 + H2O
\(MgCl_2\rightarrow Mg+Cl_2\uparrow\)
\(2Mg+O_2\rightarrow2MgO\)
\(MgO+H_2SO_4\rightarrow MgSO_4\downarrow+H_2O\)
\(MgSO_4+Ba\left(NO_3\right)2\rightarrow Mg\left(NO_3\right)_2+BaSO_4\downarrow\)
\(Mg\left(NO_3\right)_2+2NaOH\rightarrow Mg\left(OH\right)_2\downarrow+2NaNO_3\)
\(Mg\left(OH\right)_2\rightarrow MgO+H_2O\)