1. I live in a small but beautiful house with my family. It has two bedrooms, a living room, a kitchen, and a garden. My room is near the window, and I like reading there. Our house is always clean and full of love.

2. My best friend is Anna. She is kind, funny, and always helps others. We study in the same class and play together after school. She has long black hair and a bright smile. I enjoy spending time with her every day.

3. Hi Linh,
I want to tell you about my school. It is big and beautiful. There are 30 classrooms, a library, and a playground. My teachers are kind and helpful. I enjoy learning and playing with my friends here.
Best,
Mai

1. how about inviting MARK to the party.

2. there are a wardrobe, a bookshelf and a bed in my bedroom

3.The apple is in front of The dogs .

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Đây là một phản ứng trao đổi (phản ứng acid - base) cơ bản, trong đó:

• R2​Oy​ là oxide.
• HCl là acid.
• RCly​ là muối chloride.
• H2​O là nước.
• y là hóa trị của nguyên tố R trong oxide và muối (hoá trị y này cũng chính là số nguyên tử Cl liên kết với R).

Để cân bằng phương trình hoá học (PTPU) này, ta thực hiện các bước sau:

1. Cân bằng nguyên tố R

• Bên trái (R2​Oy​): có 2 nguyên tử R.
• Bên phải (RCly​): có 1 nguyên tử R.
• Thêm hệ số 2 trước RCly​: R2​Oy​+HCl⟶2RCly​+H2​O

2. Cân bằng nguyên tố Cl

• Bên phải (2RCly​): có 2×y nguyên tử Cl.
• Bên trái (HCl): có 1 nguyên tử Cl.
• Thêm hệ số 2y trước HCl: R2​Oy​+2yHCl⟶2RCly​+H2​O

3. Cân bằng nguyên tố H và O (Kiểm tra)

• Kiểm tra H:
• • Bên trái (2yHCl): có 2y nguyên tử H.
  • Bên phải (H2​O): có 2 nguyên tử H.
• Thêm hệ số y trước H2​O để cân bằng H (y×2=2y): R2​Oy​+2yHCl⟶2RCly​+yH2​O
• Kiểm tra O:
• • Bên trái (R2​Oy​): có y nguyên tử O.
  • Bên phải (yH2​O): có y nguyên tử O.
  • O đã được cân bằng.

Phương trình hoá học đã cân bằng

Phương trình đã cân bằng cuối cùng là:

Ví dụ minh họa (với R=Fe và y=3)

Khi R là Sắt (III) và y=3, ta có Fe2​O3​ và FeCl3​:

(Thay y=3 vào công thức chung: 2y=2×3=6 và y=3)

hi

ko

2

2

3