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1 was arrested before the garden by the boy yesterday
2 his cats taken care of carefully by Jack everyday
3 Has the country been protected from Covid-19 successfully
4 is reported that the man is running out of money
is reported to be running out of money\
5 has been said that the thief got out of the prison
has been said to have got out of the prison
6 was thought that Mary had turned down the job
Mary was thought to have turned down the job
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
1 My parents go shopping twice a week
2 Hoa's house has a balcony
3 My brother usually plays badminton with his friends
4 My favorite book is Tam and Cam. What is yours?
5 There are 10 pencil cases on the table
1.get up
2.set off
3.live on
4.deal with
5.closed down
6.come back
7.turned it down
8,look through
1. I talk less comfortably than Tom.
I don't talk as comfortably as Tom.
I don't talk so comfortably as Tom.
3. She plays tennis better than we (do).
She doesn't play tennis as badly as we (do).
4. I suggest preserving this tradition.
I suggest that we should preserve this tradition
How about preserving this tradition.
5. Jack wondered whether or not he should make friends with that man then.
6. Due to the wonderful trip, we didn't want to finish.
Câu 1.
Dùng dung dịch axit clohidric \(HCl\) vào hai chất trên:
+Thấy xuất hiện khí bay ra: kali cacbonat \(K_2CO_3\)
\(K_2CO_3+2HCl\rightarrow2KCl+H_2O+CO_2\uparrow\)
+Không hiện tượng: kali sunfat \(K_2SO_4\)
Câu 2.
a)\(Na_2O+H_2O\rightarrow2NaOH\)
b)\(Na_2O+H_2O\rightarrow2NaOH\)
\(6NaOH+Fe_2\left(SO_4\right)_3\rightarrow2Fe\left(OH\right)_3+3Na_2SO_4\)
Câu 3.
\(n_{NaOH}=\dfrac{20}{40}=0,5mol\)
\(n_{HNO_3}=\dfrac{20}{63}\approx0,3mol\)
\(NaOH+HNO_3\rightarrow NaNO_3+H_2O\)
0,5 0,3
\(\Rightarrow NaOHdư\) \(\Rightarrow\)Qùy hóa xanh.
