Bài 9:

a. Tính toán để biết trong các chất sau chất nào giàu oxi hơn: KMnO₄ ;KClO₃; KNO₃

b. So sánh số mol khí oxi điều chế được bằng sự phân huỷ cùng số mol của mỗi chất nói trên.

Bài 8: Tính khối lượng KClO₃ cần thiết để điều chế một lượng oxi đủ để đốt cháy hết:

a. Hỗn hợp 0,5 mol CH₄ và 0,25mol H₂

b. Hỗn hợp 6,75 gam bột nhôm và9,75 gam bột kẽm

Bài 3: Tính thể tích oxi thu được:

a. Khi phân huỷ 9,8 gam kali clorat trong PTN

b. Khi điện phân 36 Kg H₂O trong công nghiệp

lấy cùng một lượng kclo3 và kmno4 để điều chế khí o2. chất nào cho the tich o2 hơn ?

hoa tan hoan toan 5,6 g 1 kim loai co hoa tri la II vao dung dich HCl thu dc 2,24 l H2. tim kim loai tren

II. Combine each pair of sentences to make one sentence, using the words given in brackets.

1. Lang Lieu couldn’t buy any special food . He was very poor. (BECAUSE)

2. During Tet, Vietnamese people buy all kinds of sweets. They make Chung cakes as well.(SO)

3. The Hung King Temple Festival was a local festival. It has become a public holiday in Viet Nam since 2007.(HOWEVER)

4. At the Mid-Autumn Festival, kids can sing, dance, and enjoy moon-cakes. Every child like it very much.(THEREFORE)

5. We don’t celebrate the festival. It costs too much money. (If)

6. Most people book tickets long in advance. They cannot return home for Tet. (Otherwise)

7. Children like Tet because it’s a long holiday. They can also receive lucky money. (Moreover)

8. The buffalo-fighting Festival sounds frightening. Many people come to enjoy it. (Although)

9. The Hung King Temple Festival was a local festival. It has become a public holiday in Vietnam since 2007. (Nevertheless)

10.We won’t hold the festival. It costs too much money. (IF)

11. The tortoise was running. The hare was sleeping. (WHILE)

12. The girl worked hard. Her stepmother wasn’t happy. (ALTHOUGH)

13. The Buffalo- fighting Festival took place in Do Son last Saturday. There were so many people. (BECAUSE)

14. A lion can run 100km/hr while a horse can run 80km/hr. (fast)

A lion can run

15. They are both good at speaking English, but Hung speaks better than Nam. (badly)

Nam speaks English

16. The Eagle team performed more successfully than the Tiger team. (successfully)

The Tiger team performed

17. A sports car goes faster than an ordinary car. (slowly)

An ordinary car goes

18. No one in my group is more intelligent than Long.

Mary

19. Son Tung M-TP performs the song “Chung ta khong thuoc ve nhau” very beautifully.

The song “Chung ta khong thuoc ve nhau”

20. He uses all his free time to look after his garden.

→ He spends

I. Identify a mistake in each sentence and correct it.

1. In Australia, you mustn’t to comment on a person’s accent.

2. In my family, children has to get permission before leaving the dining table.

3. When I came, the whole family is having dinner around a big dining table.

4. Lang Lieu couldn’t buy any special food while he was very poor.

5. When you visit a temple in Thailand, you has to follow some important customs.

6. People should wear short shorts and tank tops. This is disrespectful

7. People can wear sandals, but these have to has a strap around the back.

8. People should to lower their voice inside the temple.

9. Women have avoid touching monks.

Once upon a time there was a young girl called Cinderella. Cinderella was living happily with her family when her mother died. Her father married an evil widow with two daughters. Cinderella’s stepmother and two stepsisters mistreated her. She had to wear old clothes and work hard while the sisters wore fancy clothes and had fun. A good witch helped Cinderella. She turned Cinderella’s old dress into a beautiful gown. Cinderella went to a party and a handsome prince politely invited her to dance with him. He fell in love with her and wanted to find out who she was. Cinderella left the party in a hurry and didn’t tell the prince her name. but she left a glass slipper, and the prince used that to find her. They got married and lived happily ever after.

I. Answer true (T) or false (F).

True False

a. Cinderella was living happily with her family when her mother died.

b. Her father married a kind woman.

c. Her stepmother and two stepsisters were very kind to her.

d. The prince got married to the girl who fitted the left glass slipper.

II. Answer the questions.

1. What did Cinderella’s father do when his wife died?

2. How did Cinderella’s stepmother and two stepsisters treat her?

4. What did the prince use to find Cinderella?

5. What happened in the end?

After retiring, my uncle – a lover of the sea- took up a strange leisure activity : he spends most mornings at the beach, looking for things that the sea sends ashore. He says: It’s a multi-beneficial leisure activity. I can get some exercise, blending, picking up, and walking. I can breathe the fresh air and enjoy the vastness and quietness of the sea. Sometimes I watch the children playing beach games and I feel years younger. At the same time, I can also clean the beach. It’s volunteer work, isn’t it? Many of the things I pick up from the beach are still useful to someone. I clean them and sell them at the Sunday flea market in the town nearby. Do you know of any leisure activity that pays? Mine does!

1. When did the writer’s take up this strange activity?

2. Which part of the day does he go to the beach?

3. How does he feel watching the children playing beach games?

4. What kind of volunteer work does he do?