Cho phản ứng đơn giản xảy ra trong bình kín: H₂(g) + Cl₂ (g) ⟶ 2HCl (g).

Tốc độ phản ứng thay đổi như thế nào nếu nồng độ H₂ giảm 4 lần và nồng độ Cl­₂ tăng 2 lần.

Which of the following best restates each of the given sentences?

It is believed that people with mental health conditions, all over the world, are seen to be good and efficient workers.

Vai trò đối với sức khỏe của phòng, trị bệnh cho vật nuôi là

Nội dung nào sau đây là tiền đề về tư tưởng đưa đến sự bùng nổ của cách mạng tư sản Anh?

Mục đích tham gia hợp tác xã của các thành viên là gì?

Read the passage carefully. Choose an option (A, B, C, or D) that best answers each question from to 646 to 650:

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

What could be the most suitable title for the passage?

Mô phân sinh đỉnh không có ở vị trí nào của cây?

Nhận định nào không phải nguyên tắc của sự phát triển bền vững ở Việt Nam?

Ý nào sau đây không thuộc nội dung vai trò của sản xuất kinh doanh?

Cách ghi kết quả đo chính xác là

Cây ngày ngắn là cây có đặc điểm gì?

Read the following passage about the Science in Service of Humanity and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

Science has come out of its shell in laboratories to become a powerful force for human advancement. Modern scientific endeavors increasingly focus on addressing real-world challenges affecting communities globally. From developing vaccines that save millions to creating technologies connecting people across continents, science serves humanity in countless ways. This shift represents a fundamental evolution in how we perceive scientific progress—not merely academic pursuit but a practical tool for improving lives and solving pressing problems.

[I] Medical breakthroughs exemplify how science directly benefits humanity. [II] For instance, gene therapy offers hope for those with inherited conditions, while artificial intelligence helps diagnose diseases earlier and more accurately. [III] These advancements didn't happen overnight; scientists had to burn the midnight oil for years before achieving success. [IV] Their perseverance demonstrates that when science targets humanitarian goals, results can transform society profoundly.

Environmental science has emerged as another crucial domain where laboratory work translates into human welfare. Climate scientists provide data informing policy decisions affecting billions. Conservation biologists develop strategies to protect biodiversity, ensuring future generations benefit from natural resources. Agricultural researchers create drought-resistant crops helping communities withstand changing climate conditions. Despite these contributions, environmental science faces challenges including funding limitations, political resistance, and urgency of addressing accelerating climate change. Nevertheless, dedicated scientists continue their work, recognizing environmental health directly impacts human wellbeing.

The future of science in service of humanity looks increasingly collaborative and inclusive. Modern approaches incorporate diverse perspectives, including indigenous knowledge and community participation. Citizen science projects engage non-professionals in data collection, democratizing the scientific process. Open-access publishing makes research findings available to anyone with internet access, not just wealthy institutions. These developments suggest science's greatest potential lies in becoming more accessible and responsive to human needs. As we face complex global challenges, from pandemics to climate change, science serving humanity offers our best hope for a sustainable future.

The phrase “come out of its shell” in paragraph 1 could be best replaced by _________.

Tỉ lệ H : O trong phân tử carbohydrate là bao nhiêu?

Ngôn ngữ nào dưới đây không phải ngôn ngữ bậc cao?

Yếu tố nào tạo thuận lợi để Liên bang Nga tiếp thu thành tựu khoa học - kĩ thuật của thế giới?

Sau Chiến tranh thế giới thứ hai, vùng Tây Âu thuộc phạm vi ảnh hưởng của:

Phát biểu bằng lời của mệnh đề $P$: ''$\forall x\in \mathbb{R}, \, x^2 \ge 0$'' là

Điền thông tin còn trống để hoàn thành bài tập sau:

Nguyên tử của nguyên tố X có tổng số hạt cơ bản (proton, electron, neutron) là 49, trong đó số hạt không mang điện bằng 53,125% số hạt mang điện.

1. Điện tích hạt nhân của X là .

2. Nguyên tử X được tạo thành bởi hạt nhân chứa proton, neutron và vỏ nguyên tử chứa electron.

Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17 

a. Engaging in hobbies and personal interests can have a profound impact on overall well-being.

b. These activities provide a much-needed break from the routine of daily life.

c. Dear Sam, I've been reflecting on our discussion about balancing work and personal life.

d. Hobbies also allow for personal growth and skill development.

e. Gardening, painting, or playing a musical instrument can foster creativity and boost self-esteem.

Nội dung nào sau đây là một trong những chức năng của Sử học?

Cộng đồng ASEAN được xây dựng với ba trụ cột, trong đó KHÔNG bao gồm