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14 tháng 3 2022
1.A
2.A
3.B
4.C
5.B
6.C
7.A
8.A
9.B
10.A
11.B
12.A
13.C
14.B
15.B
16.A
17.A
18.A
19.A
20.C
DT
Đỗ Thanh Hải
CTVVIP
17 tháng 9 2021
1 is explained
2 was stolen
3 will be opened
4 is being closed
5 is going to be built
QN
2
VH
0
DT
Đỗ Thanh Hải
CTVVIP
5 tháng 7 2021
1 are
2 am
3 is
4 are
5 are
6 are
7 is
8 is
9 is
10 are
IV
1 is writing
2 are losing
3 is having
4 is staying
5 am not lying
6 is always using
7 are having
8 Are you playing
9 are not touching
10 Is - listening
11 Is- winning
12 am not staying
13 is not working
14 is not reading
15 isn't raining
16 am not listening
17 Are they making
18 Are you doing
19 Is - sitting
20 is - doing
21 are-putting
22 are-wearing
23 is-studying
5 tháng 7 2021
2, am
3, is
4,are
5,are
6,are
7,is
8,is
9,is
10,are
IV
1,2,7 OK
3,is having
4,has stayed
5,am not lying
6,always uses
8,Are-playing
9,not to touch
10,Is-listening
11,Are-winning
12,am not staying
13,isn't working
14,isn't reading
15,isn't raining
16,am not listening
17,Are-making
18,Are-doing
19,Is-sitting
20,is-doing
21,do-putting
22,do-wear
23,is-studying
R
1
RY
24 tháng 4 2022
a. f(\(\dfrac{-1}{2}\)) = \(4.\left(\dfrac{-1}{2}\right)^2+3.\left(\dfrac{-1}{2}\right)-2\)
= \(4.\dfrac{1}{4}-\left(\dfrac{-3}{2}\right)-\dfrac{4}{2}\)
= \(\dfrac{2}{2}+\dfrac{3}{2}-\dfrac{4}{2}\)
= \(\dfrac{1}{2}\)
a) \(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right);n_{HCl}=\dfrac{36,5.10\%}{36,5}=0,1\left(mol\right)\)
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Ban đầu: 0,15 0,1
Pư: 0,05<----0,1
Sau pư: 0,1 0 0,05 0,05
\(\Rightarrow V=V_{H_2}=0,05.22,4=1,12\left(l\right)\)
b) \(m_{dd.sau.p\text{ư}}=36,5+0,05.24-0,05.2=37,6\left(g\right)\)
dd sau phản ứng có chứa chất tan duy nhất là MgCl2
\(\Rightarrow C\%_{MgCl_2}=\dfrac{0,05.95}{37,6}.100\%=12,633\%\)
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