Cân bằng phương trình hóa học và cho biết tỉ lệ số nguyên tử, phân tử.

1) Zn + O₂ ---> ZnO

2) Al + AgNO₃ ---> Al(NO₃)₃ + Ag

3) Mg + N₂ ---> Mg₃N₂

4) FeS₂ + O₂ ---> Fe₂O₃ + SO₂

5) FeCl_x + Al ---> Fe + AlCl₃ ( cân bằng theo giá trị x)

Hãy nêu hiện tượng và giải thích:

1) Khi thả bóng (biết khí được bơm vào bong bóng phần lớn là khí hiđro).

2) Khi rót rượu champagne (sâm banh) vào tháp ly có chứa nước đá khô trong buổi tiệc cưới ( biết khí sinh ra phần lớn là khí cacbon đioxit CO₂).

Ex1: Viết câu cảm thán với "what"

1. Windsor is a very old castle.

2. It is a fantastic fairy tale.

3. Tiana is a very intelligent princess.

4. Cinderella has beautiful brown eyes.

5. The weather was terrible that day.

6. We've just learned a humorous folk tale.

7. The Queen is wearing an elegant gown.

8. They are greedy foxes.

9. The monster is a great fool.

10. Saint Giong is a dramatic legend.

Rút gọn biểu thức sau:

P=2.(x+y) (x-y)-(x-y)²+(x+y)²-4y²

Viết câu sử sụng hình thức câu cảm thán với "what" hoặc "how".

1.the city is noisy

2. He is a fast runner.

3. Her mother cooks well.

4. They had an unforgettable is journey.

5. The train is crowded.

6. He is a rude man.

7. The weather is nice.

8. His brother swims well.

9. These dresses are colorful.

10. The children are stubborn.

1.One beutiful evening a young princess put on her bonnet and dogs, and went out to take a walk by............in a wood. (her)

2. When the price set eyes on Cinderella, he was stuck by her............... (beautiful)

3. The countryside in the area is ........ and most of buildings there are made from an.........type of light stone.(charm,attract)

4. Banh Chung was spare and........ the earth. Banh Day was round and ........ the sky. (symbol)

5. Snow White lived.........with the dwarves in the wood.(happy)