Hòa tan 12,45 gam hỗn hợp gồm Al và Fe bằng dung dịch HCl dư, thu được 8,4 lít H2(đktc) và dd A

a) Tính phần trăm theo khối lượng mỗi muối trong hỗn hợp ban đầu

b)Tính thể tích dung dịch HCl 2M đã dùng biết đã dùng dư 15% so với lí thuyết

Help !!!

1. They arrived to Ha Noi at 4 p.m.

2. Minh has an appointment at  10.30 this morning.

3. I like take part in  sports.

4. The regular activity is a 5 km walk on  the beach on  Sunday morning.

5. You should brush your teeth in  every meal.

6. She lived in  America in  1979.

7. Remember to wash your hands on  meals.

8. What is on TV today?

9. Children shouldn’t play video games .for. a long time.

10. Some children play video games .at  home, other play them on arcades.

1.A 2.F 3.B 4.C 5.E 6.D

He is very hard- working, kind, intelligent and believe in life.

1,She usually got up late when she was a child

--->She used to get up late when she was a child

2,He doesn't go to school late any more

-->He used to go to school late.

3,I went fishing with my brother when I was a child

--->I used to go fishing with my brother when I was a child.

4,Minh usually jogged when he was yoing

---->He used to jog when he was young.

5,He often played the piano at night

--->He used to play the piano at night

6,When I was a child,I lived in LonDon

--->I used to live in LonDon, when I was a child.

7,My brother often played video games when my mother went out

--->My brother to play video games when my mother went out.

8,There isn't a beautiful building here now

-->There used to be a beautiful building

9,There was a banyan tree here a few years ago ,but now there isn't

--->There used to be a banyan tree here a few years ago.

10,My father isn't busy with his work any more

--->My father used to be busy with his work.

Learn by heart

Read a lot

Make a note a lot of new words

\(x=\dfrac{3-2\sqrt{2}}{4}=\dfrac{2-2\sqrt{2}+1}{4}=\dfrac{\left(\sqrt{2}-1\right)^2}{4}=\left(\dfrac{\sqrt{2}-1}{2}\right)^2\)

\(A=\dfrac{3\sqrt{\left(\dfrac{\sqrt{2}-1}{2}\right)^2}-5}{2\sqrt{\left(\dfrac{\sqrt{2}-1}{2}\right)^2}+1}=\dfrac{\dfrac{3\sqrt{2}-3}{2}-5}{\sqrt{2}-1+1}=\dfrac{3\sqrt{2}-3-10}{2}.\dfrac{1}{\sqrt{2}}=\dfrac{3\sqrt{2}-13}{2\sqrt{2}}=\dfrac{6-13\sqrt{2}}{4}\)

1.The house which has a beautiful garden is very modern.

2.That man, whose wife and family are away, seem very lonely.

3.He is reliable friend whom I can trust with anything.

4.That mountain, which has many dangerous slopes, is difficuld to climb.

5.Those prize pigeons, which were very valuable, have been stolen.

Khi ánh mắt ta chạm nhau :)

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