a) (1) 2Cu + O₂ ➙ 2CuO
(2) CuO + 2HCl ➙ CuCl₂ + H₂O
(3) CuCl₂ + 2NaOH ➙ Cu(OH)₂ + 2NaCl
(4) Cu(OH)₂ ➙ CuO + H₂O

(5) CuO + H₂SO₄ ➙ CuSO₄ + H₂O
(6) NO₂ + SO₂ ➙ NO + SO3
(6) CuSO₄ + Zn ➙ Cu + ZnSO4

b) (1) Fe + 2HCl ➙ FeCl₂ + H₂

(2) 2FeCl₂ + H₂O + NaClO + 4NaOH ➙ NaCl + 2Fe(OH)₃

(3) Fe(OH)₃➙ Fe₂O₃ + 3H₂O

(4) Fe₂O₃ + 2Al ➙ Al₂O₃ + 2Fe

(5) Fe + CuSO₄ ➙ FeSO₄ + Cu

(6) FeSO₂ + Ba(OH)₂ ➙ Fe(OH)₂ + BaSO₄
c) (1) S + O₂ ➙ SO₂

(2) SO₂ + H₂O ➙ H₂SO₃
(3) H₂SO₃ + Na₂O ➙ Na₂SO₃ + H₂O
(4) Na₂SO₃ + H₂SO₃ ➙ H₂O + Na₂SO₄ + SO₂

₍₅₎

(1) CuO + H₂SO₄ ➙ CuSO₄ + H₂O

(2) CuSO₄ + BaCl₂ ➙ CuCl₂ +BaSO₄

(3) 3CuCl₂ + 2Al ➙ 2AlCl₃ + 3Cu
(4)  2AlCl₃ + 6H₂O ➙ 2Al(OH)₃ + 3H₂ + 3Cl₂

(5) 2Al(OH)₃ ➙ Al + 3H₂O
(6) H₂O + Na₂O ➙ 2NaOH

bỏ chữ i like giúp em nhé em ghi nhầm

What’s your favorite type of media? Why?
- My favorite type of media is i like reading novels with themes about Vietnamese history because they can help me understand all the stories of heroes who died about the country and help me understand life during the war.
Tell some advantages and disadvantages of the Internet.
+The advantage of the Internet is that it helps us find information in the fastest way and entertain after stressful studying hours.
+The downside of the Internet is that it can make children addicted and harm their health.

What do you use the Internet for? - Why do people use the Internet? 

-I use the Internet to be able to contact my distant relatives and find solutions to difficult exercises.

-People use the Internet because the Internet is a storehouse of knowledge for everything and for entertainment after school and tired work.

a) Ptr: Fe + 2HCl -> FeCl₂ + H₂ 
Tl:       1         2          1          1
n:      0,25    0,5        0,25      0,25
b) n_Fe= \(\dfrac{m}{M}\)= \(\dfrac{14}{56}\) = 0,25 (mol)
 m_FeCl2= n x M= 0,25 x 127 = 31,75 (g)
c) V_HCl=\(\dfrac{n}{C_M}\)= \(\dfrac{0,5}{1}\)= 0,5 (\(l\))
Đổi 0,5\(l\)= 500m\(l\)

Chí công vô tư là sự công bằng, không thiên vị

-Biểu hiện của chí công vô tư: 

+ Ko thiên vị, che giấu những hành vi sai trái của bn bè
+ Ko im lặng, thờ ơ trc những hành vi sai trái, ko đúng.