Hai nguyên tử Y kết hợp với 3 nguyên tử oxi tạo ra phân tử oxit . Trong phân tử , nguyên tố oxi chiếm 30% về khối lượng . Tìm nguyên tố Y

Nguyên tử A có n-p=1. Nguyên tử có n'=p'. Trong phân tử AyB có tổng số proton là 30. Khối lượng của nguyên tử A chiếm 74,19%. Tìm tên của nguyên tử A và B, viết công thức của hợp chất AyB.

Trong các hợp chất sau , hợp chất nào có hàm lượng FE cao nhất: FeO;Fe2O3;Fe3O4;Fe(OH)3;FeCl2;FeSO4;5H2O

So sánh số ngtử õi có trong 19,6g H3PO4 và 10g CuSO4, 5gH2O

Fairy tales are very good for children beacuse of some reasons. Firstly, they boost a child's imagination and cultural literacy. A child's imagation is a powerful and unique thing. It's not only used to make up stories and games, it;s a key factor in their creative thoughts and can define the type of education, career and life they have. Fairy tales often include difference cultures and ways of doing things. They teach children about cultural difference in the world outside. Then, they gift children a curiosity to learn new things and experience new places.

Secondly, fairy tales teach children right from wrong. It;s always in a fairytales's DNA to have a strong moral lesson, a fight between good and evil, love and loss, and these lessons rub off on our children. Fairy tales teach children that good persons will always win and, while this may not be true in aspects of the of the real world, the lesson is simple and important. Be the hero, not the villain, Learn to hope for better.

1. How many main advantages of fairy tales are mentioned in the passage?

2. What does the writer say about children's imagination?

3. According to the writer, what do fairy tales often include?

4. What do fairy tales tech children?

5. What does a fairy tale aways have?

Tim loi sai roi sua lai

1. The hare walked in the wood when he saw the tortoise

2. I love all the stories that I have grown in with

3. Young readers always love kind-heart characters and hate cunning ones

4. The beautiful princess was awoke by the prince's kiss after along sleep in the wood, and she was taken back to the castle.

5. When the Cinderella was crying, the fairy suddenly appear to help her

viet lai cau sau thanh cau bi dong

1.Some money was given to me by my father yesterday

2. They will invite us to go with them tomorrows

3. My father repaired my bike yesterday

4. My mother cook to meals everyday

5. My brother has sutdied English for 2 year

6. They have taken their children to school