HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
26. They're going to bring out a guidebook to different beauty spots in Vietnam.
27. He wondered "how can I tell this news to my parents?"
28. She wondered If she told her parents what she relly thinks.
29. Ho Chi Minh City isn't as busy as Bejing.
30. Although this museum is small, it has many unique artefacts
She suggested going for a swim now
câu c mình sai nha bạn!
Câu 4:
a). Zn + H2SO4 → ZnSO4 + H2
1 1 1 1
0,1 0,1 0,1
b). nZn= \(\dfrac{6,5}{65}\)= 0,1 (mol)
⇒nH2= 0,1 (mol)
⇔VH2= n . 22,4 = 0,1 . 22,4 = 2,24(l).
c). 100ml = 0,1 l
⇒CM = \(\dfrac{0,1}{0,1}\)= 1M
Câu 3:
a). Ca(OH)2 + 2HCl → CaCl2 + 2H2O
1 2 1 2
0,3 0,15 0,3
b). 100ml = 0,1 l
nHCl = CM . V= 3 . 0,1 = 0,3 (mol)
nCa(OH)2 =\(\dfrac{0,3.2}{2}\)= 0,3(mol).
VCa(OH)2= \(\dfrac{n}{C_M}\)= \(\dfrac{0,3}{1}\)= 0,3 (lít).
c). nCaCl2= \(\dfrac{0,3.1}{2}\)= 0,15(mol).
VCaCl2 = n . 22,4 = 0,15 . 22,4 = 3,36l
⇒ CM = \(\dfrac{n}{V}\)= \(\dfrac{0,15}{3,36}\)= 0,045M.
II/Tự luận:
Câu 1:
1. (1). Fe2(SO4)3 + 6NaOH → 3Na2SO4 + 2Fe(OH)3↓
(2). 2Fe(OH)3 → Fe2O3 + 3H2O↑
(3). Fe2O3 + 6HCl → 2FeCl3 + 3H2O↑
2. (1). S + O2 → SO2
(2). 2SO2 + O2→ 2SO3
(3). SO3 + H2O → H2SO4
(4). H2SO4đặc + Cu → CuSO4 + SO2↑ + H2O↑.
Câu 2:
a). -Trích mẫu thử.
- Cho 2 mẫu thử vào quỳ tím thì cả 2 đều không bị đổi màu.
-Cho K2CO3 tác dụng với Na(OH)2 sẽ tạo ra kết tủa trắng.
PTHH: K2CO3 + Na(OH)2 → CaCO3 + 2KOH
Vậy chất còn lại là KCl.
b). -Trích mẫu thử.
-Cho các mẫu thử vào quỳ tím thì cả 2 đều không bị đổi màu.
-Cho NaCl tác dụng với AgNO3 sẽ tạo kết tủa trắng.
PTHH: NaCl + AgNO3 → AgCl↓ + NaNO3.
- Vậy chất còn lại là Na2SO4
1. My father allowed me to use his car.
2. The sudden noise made me jump.
3. Mary told John to didn't tell anyone her new address.
4. I'd rather not visit the museum.
5. Lan reminded Nam to send his parents her regard.
6. The lesson wasn't short enough for us to learn by heart.
7. It was very stupid of her to go out without a raincoat.
8. would you please make me some tea?
9. I watched them get out of the car.
10.He was the first man to reach the top of the mountain
VI
1. how
2. to
3. what
4. how
5. how
6. what
7. how
8. how
9. what
10. how
V
1. could.
2. were reading.
3. would travel.
4. were never.
5. would do
6. didn't go
7. might
8. had to
9. is
10. needed