1.Điền vào chỗ trống những CT thích hợp: a)________ + H2SO4 --------> _______ ⬇️ +_____⬇️ b)______ + HNO3 -------> _________ dd + ______ ⬆️ + ________ c) _______ + Ca(HSO3)2 -----> _______ ⬇️ + ______ dd + _______ 2. Hoà tan 24g h2 Fe-Cu vào dd HCl dư thu được 4,48l H2 đktc a) Xác định % mỗi kim loại trong h2 b) Nếu lấy 24g h2 vào Vl Cl2 đktc. Tìm V
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1. He has never gone abroad before.
2. She has driven for 1 month
3. We have eaten since it started to rain
4. I haven't had my hair cut when I left her
5. She hasn't kissed me for 5 months.
6. We haven't met for a long time.
7. How long have you had it?
8. I haven't had a delicious meal before
9. The last time I saw him was 8 days ago.
10. It is my first time I have ever taken bath since Monday
1. He hasn’t gone abroad before.
2. She has driven for a month.
3. We have already eaten when it rained.
4. I haven’t cut my hair since I left her.
5. She hasn’t kissed me for 5 months.
6. We haven’t met for a long time.
7. How long have you had it?
8. I haven’t had such a delicious meal before.
9. The last time I saw him was 8 days ago.
10. It is Monday since I last took a bath.
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\(13\left(x+45\right)=13^{29}:13^{27}\)
\(\Leftrightarrow13\left(x+45\right)=13^{29-27}\)
\(\Leftrightarrow13\left(x+45\right)=13^2\)
\(\Leftrightarrow x+45=13\)
\(\Leftrightarrow x=-32\)
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Ba + 2H2O ---> Ba(OH)2 + H2
Fe2O3 + 3H2SO4 ---> Fe2(SO4)3 + 3H2O
MxOy + 2yHCl ---> xMCl2y/x + yH2O
8Al + 30HNO3 ---> 8Al(NO3)3 + 3N2O + 15H2O
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\(a.2Fe+6H_2SO_{4\left(đ\right)}\rightarrow Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\\ b.Fe+6HNO_{3\left(đ\right)}\rightarrow Fe\left(NO_3\right)_3+3NO_2+3H_2O\\ c.Fe+4HNO_{3\left(l\right)}\rightarrow Fe\left(NO_3\right)_3+NO+2H_2O\\ d.3FeS+12HNO_3\rightarrow Fe_2\left(SO_4\right)_3+Fe\left(NO_3\right)_3+9NO+6H_2O\)
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Các câu hoàn chỉnh là:
a. nương rẫy
b. lương thiện
c. lĩnh lương
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Vậy đáp án đúng là:
a. rắn lột da
b. quốc gia
c. ve kêu ra rả
úi ùi ms lm dc 2 ceo:>
1.
a,\(BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\)
b, \(3Cu+8HNO_3\rightarrow3Cu\left(NO_3\right)_2+2NO\uparrow+H_2O\)
c, \(2NaOH+Ca\left(HSO_3\right)_2\rightarrow CaSO_3\downarrow+Na_2SO_3+2H_2O\)