Tính khối lượng của Fe trong 50kg quặng chứa 80% khối lượng Fe2O3

1/Our team won the game because we played very(good/well)

2/I tried on the shoes and they fitted me(perfect/perfectly)

3/He had an accident because he was driving too(fast/fastly)

4/Tam drove...(careful/carefully) along the narrow road.

5/Do you usually feel...before examinations(nerious/neriously)

6/Her English is quite(fluent/fluently)

7/She fell and hurt her(bad/badly)

8/You look...!Are you all right?(terrible/terribly)

9/He look at me...when I intersupted him(angry/angrily)

10/I always feel...when the sun is shining(happy/happily)

Chuyển câu chủ động thành câu bị động:

1, Alexander Bain invented the facsimile in 1943=>

2, They dry the beans in the sun=>

3, People can make payment at any post office=>

4, How do people learn English=>

5, They are going to build a new supermarket next year=>

6, Where did you take there photographs=>

7, The foreman is showing the stundents around the factory=>

8, Has the council postponed the meeting=>

9, We haven't finish our homework yet=>

10,They were cleaning room when I arrived=>

Tìm lỗi sai và sửa lại:

1/ I'd like sending these postcard to America

2/ The new shopping mall is quite different with the present

3/ Shopping in the mall is more comfort than in the market

4/ I've studied English since I've started high school

5/ Everyone in the neighborhood are pleased with the new mall.

6/ My father has worked in that company since more than twenty years

7/ Today seems as hotter as yesterday,but the humidity is lower

8/ Is surface mail much more cheap than airmail

9/ My uncle has lived in London for 10 years,but now he lives in Bristal

Cân bằng các PTHH sau:

a,Al + H2SO4 -> Al2(SO4)3 + SO2 + H2O

b,Al + H2SO4 -> Al2(SO4)3 + H2

c,CuO + NH3 -> Cu + N2 + H2O

d,C3H6 + O2 -> CO2 + H2O

e,C4H6 + O2 -> CO2 + H2O

f,Al +CuSO4 -> Al2(SO4)3 + Cu

g,H2S + O2 -> SO2 + H2O

h,H2SO4 + NH3 -> (NH4)2 + Cu

i,Cr2O3 + H2SO4 -> Cr2(SO4)3 + H2O

k,H2SO4 + HI -> I2 + H2S = H2O

Cân bằng các PTHH sau:

a,C6H6+O2 -> CO2+H2O

b,K2O+H2O -> KOH

c,K + H2O ->KOH+H2

d,NaOH+Fe2(SO4)3 -> Na2SO4+Fe(OH)3

e,FeS2+O2 -> Fe2O3+SO2

f,BaCl2+Na2SO4 -> BaSO4+NaCl

i,Fe+AgNO3 -> Fe(NO3)2+Ag

k,KClO3 -> KCl+O2

Đốt cháy hoàn toàn 33,6g sắt trong Oxi thu được 46,4g Oxit Sắt Từ Fe3O4 .Hãy tính khối lượng Oxi đem p/ứ?

Cho hợp chất:Crx(SO4)3 có PTK là 392 đvc.Tính x và viết CTHH của chất trên.