1D 2B 3C 4A 5A 6C 7A 8A 9B 10A 11C 12D 13D 14D 15A 16D 17A 18C 19C 20D 21D 22C 23C 24A 25B 26C 27D 28B 29C

12) \(4C_xH_y\left(COOH\right)_2+\left(2x+y+2\right)O_2\xrightarrow[]{t^o}\left(4x+8\right)CO_2+\left(2y+4\right)H_2O\)

13) \(2KHCO_3+Ca\left(OH\right)_2\rightarrow K_2CO_3+CaCO_3+2H_2O\)

14) \(Al_2O_3+6KHSO_4\rightarrow Al_2\left(SO_4\right)_3+3K_2SO_4+3H_2O\)

15) \(xFe_2O_3+\left(3x-2y\right)H_2\xrightarrow[]{t^o}2Fe_xO_y+\left(3x-2y\right)H_2O\)

11.

$=-a(x+t)+b(x+t)=(x+t)(-a+b)=(b-a)(x+t)$

12.

$=a(m-6)-5ab(m-6)=a(m-6)(1-5b)$

13.

$=\frac{2}{5}x(4-y)+\frac{2}{5}y(4-y)$

$=\frac{2}{5}(4-y)(x+y)$

14.

$=2m(x-y)-12m^3(x-y)$

$=2m(x-y)(1-6m^2)$

15.

$=14a^2(-x+2y)+7a(-x+2y)$

$=7a(-x+2y)(2a+1)$

15 They said they would go to the beach if the weather was nice the day after (loại 1)

16 I told Mike Halen would know what to do if she were late (2)

17 Mark said he would have spoken to Frank if he had seen him the day before (3)

18 The girl said he wouldn't run away if she saw a spider (2)

19 David told her if she had too much to do, she could ask him to help her (2)

20 He told me if I studied harder, I would get high marks in next exam (1)

1+1=3

16 B

17 A

18 C

19 B

20 B

Câu 1 : 

\(a) 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ b) Na_2O + H_2O \to 2NaOH\\ c) 4Al +3 O_2 \xrightarrow{t^o} 2Al_2O_3\\ d) 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ e) 2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2\)

- Phản ứng phân hủy : a ; d

- Phản ứng hóa hợp : b ; c

- Phản ứng thế : e

Câu 2 : 

\(4P + 5O_2 \xrightarrow{t^o} 2P_2O_5\\ 3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\)

Câu 3 : 

\(a) 3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\\ b) n_{Fe} = \dfrac{126}{56}= 2,25(mol)\\ \Rightarrow n_{O_2} = \dfrac{2}{3}n_{Fe} = 1,5(mol)\\ \Rightarrow V_{O_2} = 1,5.22,4 =33,6(lít)\\ c) 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ n_{KClO_3} = \dfrac{2}{3}n_{O_2} = 1(mol)\\ m_{KClO_3} = 1.122,5 = 122,5(gam)\)