Phản ứng chuyển hoá giữa hai dạng đơn chất của phosphorus (P):

P (s, đỏ) ⟶ P (s, trắng)          \({\Delta _r}H_{298}^o = 17,6kJ\)      

Điều này chứng tỏ phản ứng:

Biểu hiện của bệnh giun đũa lợn là gì?

Giá trị của giới hạn \(\underset{x\to 1}{\mathop{\lim }}\,\frac{x-{{x}^{3}}}{\left( 2x-1 \right)\left( {{x}^{4}}-3 \right)}\) là

Cơ chế thị trường có những ưu điểm gì?

Cho tập hợp P = {1; 3} và tập hợp Q = {3; x}. Giá trị của x để P = Q là:

Đường tròn nào sau đây có tâm là \(I( - 3;5)\) và có bán kính là \(R = 4\)?

Nhược điểm của hình thức đẻ con so với đẻ trứng là gì?

Hiện tượng ứ giọt ở mép lá xảy ra trong điều kiện gì?

Sulfuric acid (\(H_2SO_4\)) là hoá chất quan trọng, được sản xuất trong công nghiệp bằng phương pháp tiếp xúc qua ba giai đoạn:

(a)  S(s) + O\(_2\)(g) \(\rightarrow\) SO\(_2\)(g)

\((b) \ 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)\) \(\Delta_rH_{298}^\circ=-197,6 \text{ kJ}\)

(c) nSO\(_3\)(g) + H\(_2\)SO\(_4\)(aq) \(\rightarrow\) H\(_2\)SO\(_4\)\(\cdot\)nSO\(_3\)(l)

Cho các phát biểu sau:

(1) Ở giai đoạn (b), cần dùng xúc tác để cân bằng chuyển dịch sang phải, giảm lượng \(SO_2\) trong khí thải.

(2) Ở giai đoạn (b), khi giảm nhiệt độ thì cân bằng dịch chuyển về phía tạo thành \(SO_3\).

(3) Nhiệt độ ở giai đoạn (b) không được quá thấp vì ảnh hưởng đến tốc độ phản ứng.

(4) Sử dụng nhiên liệu hoá thạch để cung cấp năng lượng cho quá trình sản xuất \(H_2SO_4\) có thể gây ô nhiễm môi trường.

(5) Ở giai đoạn (c), người ta dùng nước cất hấp thụ trực tiếp \(SO_3\) để thu được dung dịch \(H_2SO_4\) loãng.

Liệt kê phát biểu đúng theo kí hiệu số.

Ý nào đúng: Đâu là mặt hàng nhập khẩu chủ yếu của các nước đang phát triển?

Read the following passage 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.

A New Capital

When Pakistan was established as a new state in 1947, Karachi initially served as its capital. However, maintaining Karachi as the capital proved to be a challenge due to several disadvantages, such as its climate and the condition of the existing infrastructure. Rather than attempting to improve these issues, the government opted to create a completely new capital city. In 1959, a commission was formed to explore potential locations for this new capital. Dr. Doxiadis, a renowned architect and city planner, was appointed as the chief advisor to the commission.

Dr. Doxiadis and his team explored several possible sites for the new capital, considering both geographical and environmental factors. After a thorough evaluation, they narrowed the options down to two locations: one just outside Karachi and the other located north of Rawalpindi. Both sites had their own sets of advantages and drawbacks, making the decision a complex one.

The final choice was made after carefully considering a range of factors such as transportation, water availability, economic implications, and national interests. Ultimately, the area north of Rawalpindi was selected. On February 24, 1960, the new capital city was named Islamabad, and a comprehensive master plan for its development was created. The plan divided the area into three distinct sections: Islamabad itself, neighboring Rawalpindi, and a national park.

Each section was designed to serve a specific purpose. (I) Islamabad would function as the country’s political and cultural center, meeting the administrative needs of the nation. (II) Rawalpindi, located nearby, would continue as the regional hub for industry and commerce. (III) The national park area was intended to provide space for education, recreation, and agriculture, enhancing the quality of life for residents. (IV)

Today, Islamabad is a vibrant city with a population of around 1 million people. Known for its clean and healthy environment, it offers a pollution-free atmosphere, abundant water resources, and ample green spaces. Tree-lined streets, elegant public buildings, and well-planned shopping centers make the city a model of successful urban planning. With its efficient design and flourishing urban life, Islamabad stands as a prime example of well-executed city planning and growth.

Which of the following is NOT a factor considered when choosing the new capital city?

Trong bài thuyết trình về một vấn đề xã hội, người nói cần sử dụng lí lẽ và bằng chứng như thế nào?

Hãy chọn điều kiện cần để tạo được liên kết bảng?

Trong các cấp tổ chức của thế giới sống, cấp tổ chức cơ bản là:

(1) sinh quyển.             (2) cơ thể.                   (3) quần xã.                   (4) cơ quan.

(5) tế bào.                   (6) quần thể.                (7) hệ sinh thái.             (8) bào quan.

Một trong những trách nhiệm của các chủ thể sản xuất là gì?

There are many different ways that family members show their love for one other.

Thiết bị nào dưới đây có khả năng diệt khuẩn, tiệt trùng các dụng cụ trong phòng thí nghiệm?

Tìm phần bù của \([ - 1;5)\) trong \(\mathbb{R}\)?

Read the following passage 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 23 to 30.

Vietnamese Women’s Achievements

Women have always played an important role in Vietnam’s history. Some fight for their country, some inspire others, and some make positive changes to society. Their contributions have shaped the nation in various ways, leaving a lasting impact on culture, politics, and the arts.

Trưng Trắc and Trưng Nhị are famous examples of women who fought for their country’s freedom. Known in Vietnamese as “Hai Bà Trưng,” the Trưng sisters successfully led their people in a rebellion against foreign invaders in 40 A.D. After their victory, they ruled the country for three years, demonstrating remarkable leadership and bravery. As the first female rulers of Vietnam, the Trưng sisters have become symbols of patriotism and resilience. Their significance is even greater considering that Vietnamese women at the time had very limited access to education and politics. Their story continues to inspire generations.

Sương Nguyệt Anh is another example of an influential Vietnamese woman. As the daughter of the patriotic poet Nguyễn Đình Chiểu, she mastered literature from a young age. She worked as a teacher before becoming the editor-in-chief of Nữ Giới Chung, the first women’s newspaper in Sài Gòn, in 1918. As the first female editor in Vietnam, she made significant contributions to the press, feminism, and poetry. Through her work, she promoted women’s rights and encouraged female empowerment.

A third example is Điềm Phùng Thị. She graduated from Hà Nội Medical University in 1946 and earned a PhD in dentistry in France in 1954. However, she later pursued a career in sculpture, creating artworks that reflected her love for Vietnam. She exhibited her work throughout Europe and became the first female Vietnamese member of the European Academy of Arts and Sciences in 1992. Her name was later recorded in the Larousse Dictionary of Painters, recognizing her as a remarkable artist.

The word lasting in paragraph 1 could best be replaced by: