Đề là gì?

1 knowing the answer, they told us

2 the unique handicraft, we didn't like it

3 We looked into these machines so that we could find out the method 

We looked into these machines so as to find out the method 

4 Jack's poverty, everyone looks up to him

5 In order to choose the best chair, Linda looked through this catalouge 

6 is not as dirty as this one

7 I didn't play as successfully as Linda

8 A dog can't run as fast as a horse

A dog runs more slowly than a horse

9 No rivers in the world is as long as the Nile

10 No one in my family talks as politely as Linda

hình bé quá

sin 65⁰=cos 35⁰
\(cos70^0=sin30^0\)
\(tan80^0=cot20^0\)
\(cot68^0=tan32^0\)

Ko nhìn chữ bn ơi, bn cho to hình một tý

a.

- Thử với lượng nhỏ mỗi chất.

\(H_2SO_4+BaCl_2\rightarrow BaSO_4\downarrow\left(trắng\right)+2HCl\)

b. 

- Thử với lượng nhỏ mỗi chất.

\(K_2SO_4+BaCl_2\rightarrow BaSO_4\downarrow\left(trắng\right)+2KCl\)

c.

a.

- Thử với lượng nhỏ mỗi chất.

Câu 1:

PTHH: 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂

PTHH: Na₂O + H₂SO₄ → Na₂SO₄ + H₂O

PTHH: Cu(OH)₂ + H₂SO₄ → CuSO₄ + 2H₂O

Câu 2:

a, \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: Fe + H₂SO₄ → FeSO₄ + H₂

Mol:     0,2     0,2                            0,2

b, \(m_{Fe}=0,2.56=11,2\left(g\right)\)

c, \(C_{M_{ddH_2SO_4}}=\dfrac{0,2}{0,1}=2M\)

Em tách ra từng bài nhé !