Nguyên tử natri (sodium, Z = 11) có số eletron hóa trị là

Năm 2024, Hà Nội ghi nhận 4 đợt ô nhiễm không khí nghiêm trọng (3 đợt từ tháng 1 đến tháng 4 và 1 đợt đầu tháng 10). Theo Bộ Tài nguyên và Môi trường, tình trạng ô nhiễm không khí tại Hà Nội và TP.HCM có xu hướng gia tăng, với chỉ số chất lượng môi trường không khí nhiều thời điểm ở mức xấu, ảnh hưởng đến sức khỏe và kinh tế - xã hội. Bộ đã đề xuất các giải pháp kiểm soát chất lượng không khí tại các đô thị lớn, như giảm phát thải từ giao thông, ban hành chính sách thuế bảo vệ môi trường, siết chặt tiêu chuẩn khí thải phương tiện cơ giới. (Báo Sức khoẻ và đời sống ngày 15/11/2024)

Dựa vào thông tin, biện pháp nào dưới đây được cho là phù hợp để giảm ô nhiễm không khí? 

Người đã kháng lệnh triều đình, phất cao ngọn cờ “Bình Tây Đại nguyên soái”, lãnh đạo nghĩa quân chống Pháp là ai?

Với giá trị nào của \(m\) thì bất phương trình \( - {x^2} - x + m \ge 0\) vô nghiệm?

Công thức tính tốc độ góc của chuyển động tròn đều là

Hình thức chính thể biểu hiện nội dung nào sau đây?

Chọn ý đúng: Việc sử dụng vacxin phòng dại với mục đích điều trị là?

Vùng biển của khu vực Đông Nam Á thuộc hai đại dương nào?

Read the following passage about reading skill and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22 

Reading is an essential skill that enhances our cognitive abilities in many ways. Firstly, it improves our language skills. When we read, we learn new words and understand how they are used in context, ___(18)___. This helps in expanding our vocabulary and improving our communication skills. Secondly, reading boosts our imagination and creativity. ___(19)___, it takes us to different worlds and situations we might not experience in real life. This stimulates our creativity and helps us think outside the box. Thirdly, regular reading enhances our concentration and focus. It requires us to pay attention to details and follow complex narratives, ___(20)___. Additionally, reading provides us with knowledge about various subjects and cultures. It allows us to gain insights into ___(21)___. This broadens our perspective and helps us become more empathetic and understanding. Finally, reading is a great way to relax and de-stress. It can be a form of escapism, where we can lose ourselves in a story and forget about our daily worries, which provides a much-needed break for us. In conclusion, reading is not just a leisure activity. It plays a significant role in our cognitive development, helping us to ___(22)___. Therefore, it's important to cultivate a habit of reading from a young age.

Read the following advertisement about a new travel platform and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 1 to 6.

FAQ ON FINDING TRAVEL BUDDY

What is the concept of finding a travel buddy at Join My Trip?

You can find a travel buddy by joining trips hosted by (1) ________, whom we call Trip Leaders. The trips are (2) ________ handpicked and curated, offering you the best experience you can't find anywhere else. The Trip Leaders will be (3) ________ charge of these trips, from designing the itinerary (4) ________ the way. Furthermore, Trip Leaders will accept travelers, (5) ________ Trip Mates, on their trips and travel together. So, by joining our trips, you can be (6) ________ with other amazing travelers from all over the world.

Read the following passage about lifelong learning and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

In today’s rapidly changing world, lifelong learning has become more important than ever. ___(18)___. To stay relevant and competitive in the job market, individuals must continuously acquire new skills and knowledge.

One of the key benefits of lifelong learning is personal growth. ___(19)___. By exploring new subjects and hobbies, individuals can expand their horizons and discover new passions.

Lifelong learning can also lead to professional advancement. ___(20)___. By staying up-to-date with the latest trends and technologies, individuals can increase their value to employers and advance their careers.

However, lifelong learning can be challenging. ___(21)___. Balancing work, family, and personal commitments can make it difficult to find time for learning.

To make the most of lifelong learning, it is essential to set clear goals and create a personalized learning plan. ___(22)___. By breaking down larger goals into smaller, achievable steps, individuals can stay motivated and make progress.

Read the following passage about Vietnamese cultural identity and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questionsfrom 23 to 30.

Vietnamese cultural identity is a rich and intricate tapestry that reflects the nation's long and storied history. Rooted in over a thousand years of civilization, Vietnam's cultural identity is a fusion of indigenous traditions and external influences, shaped by its geographical location and historical interactions.

First and foremost, at the heart of Vietnamese culture is a deep reverence for family and community. Confucian values emphasizing respect for elders, filial piety, and social harmony have played a pivotal role in shaping Vietnamese society. These values are reflected in the close-knit family structures, hierarchical relationships, and communal rituals that are integral to daily life.

Secondly, Vietnamese cuisine is celebrated worldwide for its exquisite flavors and diversity. With its emphasis on fresh ingredients, fragrant herbs, and balanced flavors, Vietnamese food tells a story of the country's agricultural heritage and regional variations. Iconic dishes like pho, banh mi, and spring rolls have become global favorites, representing the culinary artistry deeply ingrained in Vietnamese culture. Also, Vietnam's artistic expressions are equally captivating. Traditional art forms like water puppetry, silk painting, and folk music continue to thrive alongside contemporary artistic movements. Ao dai, a graceful traditional dress, exemplifies the fusion of elegance and modesty in Vietnamese fashion, symbolizing cultural pride and identity.

Today, in the face of modernization and globalization, Vietnamese cultural identity remains resilient. While adapting to the challenges of the 21st century, the Vietnamese people continue to honor their traditions, celebrate their unique cultural expressions, and pass on their heritage to future generations, ensuring that their cultural identity remains vibrant and enduring.

The word their in paragraph 4 refers to___________________________

Hoạt động tiêu dùng có vai trò như thế nào đối với sản xuất, phân phối - trao đổi?

Người có cống hiến to lớn cho nền hợp xướng thế giới là:

Loại li hợp nào được sử dụng phổ biến trên ô tô?

Curcumin là một hoạt chất chống oxy hóa được dùng nhiều trong y dược. Để tách curcumin trong củ nghệ, người ta tiến hành theo các bước sau:

(i) nghiền củ nghệ thành bột;

(ii) ngâm bột nghệ trong ethanol nóng, lọc bỏ phần bã;

(iii) đun nhẹ phần dung dịch để làm bay bớt dung môi;

(iv) làm lạnh phần dung dịch còn lại rồi lọc lấy curcumin rắn màu vàng.

Theo cách làm trên, phương pháp được sử dụng để thu curcumin rắn từ dung dịch là:

Học thuyết Tam dân ở Trung Quốc do ai khởi xướng?

Thị trường lúa gạo, thị trường dầu mỏ, thị trường tiền tệ, thị trường chứng khoán, thị trường bất động sản,..thuộc loại thị trường nào?

Cho phương trình \(4^{x}-2 m \cdot 2^{x}+2 m+2=0\). Với \(m\) là tham số thực.

Phương trình có hai nghiệm phân biệt khi và chỉ khi:

Read the following passage about the impact of social media on mental health and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions

[I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can bu mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

Which of the following can be inferred from the passage?

 Đặc điểm lớn nhất của cuộc cách mạng khoa học- kĩ thuật sau Chiến tranh thế giới thứ hai là