Question

Hãy chọn hệ số và công thức hóa học thích hợp dặt vào những chỗ có dấu hỏi trong các phương trình hóa học sau ?

a) ? Cu  + ?  → 2CuO

b) Zn + ?HCl  →  ZnCl₂ + H₂

c) CaO  + ?HNO₃ → Ca(NO₃)₂ + ?

Answer 1

a, 2Cu + O2 -> 2CuO

b, Zn + 2GCl -> ZnCl2 + H2\(\uparrow\)

c, CaO + 2HNO3 -> Ca(NO3)2 + H2O

Answer 2

a, 2Cu + O2 \(\rightarrow\) 2CuO

b, Zn + 2HCl \(\rightarrow\)ZnCl2 + H2

c, CaO + 2HNO3 \(\rightarrow\) Ca(NO3)2 + H2

Answer 3

\(a\)) \(2Cu\) \(+\) \(O_2\) \(\rightarrow\) \(2CuO\)

b) \(Zn\) \(+\) \(2HCl\) \(\rightarrow\) \(ZnCl_2\) + \(H_2\uparrow\)

c) \(CaO\) \(+\) \(2HNO_3\) \(\rightarrow\) \(Ca\left(NO_3\right)_2\) \(+\) \(H_2\uparrow\)

Answer 4

a, \(2Cu\)+\(O_2\)\(->2CuO\)

b, \(Zn+2HCI->ZnCl_2+H_2\)

c, \(CaO+2HNO_3->Ca\left(NO_3\right)_2+H_2\)

Answer 5

a) 2Cu + O₂ \(\)-----> 2CuO

b) Zn + 2HCl -----> ZnCl₂ + H₂

c) CaO + 2HNO₃ -----> Ca(NO₃)₂ + H₂O

Answer 6

A) 2Cu + O₂ --t^o--> 2CuO

B) Zn + 2HCl \(\rightarrow\) ZnCl₂ + H₂

C) Cao + 2HNO₃ \(\rightarrow\) Ca(NO₃)₂ + H₂O

Answer 7

a)2Cu+O₂ \(\rightarrow\) 2CuO

b)Zn+2HCl \(\rightarrow\)ZnCl₂ +H₂

c)CaO + 2HNO_{3 \(\rightarrow\)}Ca(NO₃)₂ + H₂O

Answer 8

a) 2Cu + O₂ -> 2CuO

b) Zn + 2HCl -> ZnCl₂ + H₂

c) CaO + ?HNO₃ -> Ca(NO₃)₂ + H₂O

Answer 9

a) 2Cu + O₂ \(\rightarrow\) 2CuO

b) Zn + 2HCl \(\rightarrow\) ZnCl₂ + H₂

c) CaO + 2HNO₃ \(\rightarrow\) Ca(NO₃)₂ + H₂

Answer 10

a) 2Cu+ O₂ \(\rightarrow\) 2CuO

b) Zn+ 2HCl\(\rightarrow\) ZnCl₂+ H₂\(\uparrow\)

c) CaO+ 2HNO₃\(\rightarrow\) Ca(NO₃)₂+ H₂O

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Answer 11

a)2Cu+O₂➝2CuO

b)Zn+2HCl➝ZnCl₂+H₃

c)CaO+2HNO₃➝Ca(NO3)₂+H₂O

Answer 12

a)

b)

c)

Answer 13

a)2Cu+O2➝2CuO

b)Zn+2HCl➝ZnCl2+H3

c)CaO+2HNO3➝Ca(NO3)2+H2O

Answer 14

a) 2Cu+ O2--to--> 2CuO

b) Zn+ 2HCl-----> ZnCl2+ H2

c) CaO+ 2HNO3----> Ca(NO3)2+ H2O

Answer 15

2Cu + 2O2 -> 2CuO

Zn + 2HCl -> ZnCl2 + H2

CaO + 2H -> Ca(NO3)2 + H2

Answer 16

a)2Cu + O₂\(\rightarrow\)2CuO

b)Zn + 2HCl \(\rightarrow\)ZnCl₂ + H₂

c)CaO + 2HNO₃\(\rightarrow\)Ca(NO₃)₂+H₂

Answer 17

Hâh