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I wanted to make friends with my new neighbor. He moved here last month (1)__AND_____ he is a famous MC. He’s been on so many TV programmes. I invited him to my house to have dinner. Luckily, he was not busy that day (2)__SO_____  he could come to my house. Although he is famous, he is so kind (3)__AND____  friendly. We watched some TV programmes together after the meal. He said his favorite kind of programme was comedy (4)__SO_____  I found some of them in the TV schedule (5)__AND____  turned on the TV. He also talked about his job. He told me that working as an MC was really hard. Sometimes he has to talk all day (6)__SO____  he doesn’t have any time for breaks. But he still loves his job, because presenting in a show is really interesting (7)__AND____  challenging. My daughter asked him if she could become an MC one day. He smiled (8)___AND_____  told her to try hard, and maybe she would.

K cho mk nha

Lil Nấm cảm ơn bn nha

Khối lượng O2 phản ứng = mOxit - mKim loại = 40,6-26,2=14,4
nO2=14,4 : 32= 0,45,ol
vì nHCl = 2nO2 => nHCl = 0.9mol
vậy VHCl = 0,9 : 0,5 = ? lít
 

k nha ( ͡❛ ‿‿ ͡❛)

Bạn ơi trong số các chất trên chỉ có Fe2O3 và MgO phản ứng với HCl nhé! Trong đó Fe2O3 + 6HCl => 2FeCl3 + 3H2O, FeCl3 tan trong nước và có màu nâu / vàng nên loại nhé. MgO + 2HCl => MgCl2 + H2O. Dung dịch MgCl2 trong suốt, nên chọn MgCl2 nha bạn.

đây nha bạn thông cảm mk ko cop hình đc !!

https://i1-vnexpress.vnecdn.net/2016/03/16/Untitled-1-8018-1458102988.jpg?w=0&h=0&q=100&dpr=1&fit=crop&s=jTmQM8odIFk98FavlUoVqQ

đưg cóa bấm mk sai nha !!

lớp 4 làm gì đã học hóa

Đáp án:

EMOTROFBLCA = COMFORTABLE

ILISEETVNO = TELEVISION

ODOEGIBNURO = NEIGHBOURHOOD

ủa , tự trả lời ak 

Chúc bn hok tốt !

Ta có\(\frac{m_{BaCl_2}}{100}.100\%=5,2\%\)

=> \(m_{BaCl_2}=5,2\left(g\right)\)

Lại có : \(\frac{m_{H_2SO_4}}{29,2}.100\%=20\%\Rightarrow m_{H_2SO_4}=5,84\left(g\right)\)

Phương trình hóa học phản ứng : 

H₂SO₄ + BaCl₂ ----> 2HCl + BaSO₄ 

Tỉ lệ \(\frac{5,2}{1}< \frac{5,84}{1}\)

=> H₂SO₄ dư 

\(n_{BaCl_2}=\frac{m}{M}=\frac{5,2}{208}=0,025\left(\text{mol}\right)\)

=> \(n_{BaSO_4}=0,025\left(mol\right)\)

=> Khối lượng chất kết tủa là : \(m_{BaSO_4}=n.M=0,025.233=5,825\left(g\right)\)

\(H_2SO_4+BaCl_2\rightarrow BaSO_4+2HCl\)

\(m_{H_2SO_4}=20\%.29,4=5,88g\)

\(\rightarrow n_{H_2SO_4}=\frac{5,88}{98}=0,06mol\)

\(m_{BaCl_2}=5,2\%.100=5,2g\)

\(\rightarrow n_{BaCl_2}=\frac{5,2}{208}=0,025mol\)

Mà \(\frac{0,06}{1}>\frac{0,025}{1}\)

\(\rightarrow n_{H_2SO_4}>n_{BaCl_2}\)

Vậy \(BaCl_2\) hết và \(H_2SO_4\) dư

\(n_{BaSO_4}=n_{BaCl_2}=0,025mol\)

\(\rightarrow m_{BaSO_4}=0,025.233=5,825g\)

PTHH : Fe + H₂SO₄ => FeSO₄ + H₂ 

                                       0,04  <=  0,04 mol

=> Chất khí là H₂ , muối thu được là FeSO₄

n_H2 = 0,896: 22,4 = 0,04 mol 

Cho n_H2 = 0,04 vào PTHH ta được n_FeSO4 = n_H2 = 0,04 mol

=> m_FeSO4 = 0,04.(56+32+16.4) = 6,08 g

Complete the sentences with forms of be or have. 

1. She _____has_______ long blond hair. 

2. He _______has_____ green eyes. They look so nice. 

3. He ____has________ short blond hair. 

4. His eyes ______are______ black and quite large. 

5. Her eyes’ color ______is______ green. It is brown. 

6. She ______is______ in good-shape. She is a little thin. 

7. (she) ___Does she have_________ straight black hair? - Yes. 

8. My uncle _____has_______ medium-height. He is just a little taller than me. 

9. What (John) _____does John have_______ on his nose? - Glasses. He is reading a book. 

10. (Mai) ____Does Mai have________ short black hair or long brown hair? 

11. His mouth is small and he _____has_______ green eyes. 

12. George ______has______ short hair most of men. His hair is quite long and smooth. 

13. Miranda’s parents have brown eyes, but she doesn’t.Her eyes _____are_______ blue. 

14. Which is his complexion’s color? (it) _____Is it_______ tanned? 

15. My grandfather _____has_______ a moustache. He has got a beard.