Một nguyên tố R có Z = 16. Có bao nhiêu phát biểu đúng về R trong các phát biểu sau:
(1) Công thức oxit cao nhất có dạng RO3
(2)Nguyên tử R có 4 electron ở lớp ngoài cùng
(3) R là nguyên tố họ p
(4) R là kim loai
Đề thi giữa HK1 môn Hóa học 10 CTST năm 2022-2023 được biên soạn và tổng hợp những kiến thức cơ bản đã học nhằm giúp học sinh củng cố kiến thức, đánh giá năng lực, và chuẩn bị tốt hơn cho các kỳ thi quan trọng sắp tới.
Câu hỏi liên quan
Giá trị nội dung của văn bản Hê-ra-clet đi tìm táo vàng là gì?
Giá trị lớn nhất của hàm số \(y=3\text{sin}x\) trên tập xác định \(\mathbb{R}\) là
Choose A, B, C or D to complete each sentence.
Employees should _________ the company's long-term goals when planning their career development.
Nội dung nào sau đây không phải là hình thức để học tập và tìm hiểu lịch sử?
Tập hợp C={21;61;121;201;301} viết bằng cách chỉ ra tính chất đặc trưng của phần tử là
Một trong những di sản văn hóa phi vật thể tiêu biểu của Việt Nam là:
Which of the following best restates each of the given sentences?
The researchers are conclusively confident that their findings will revolutionize the field.
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 from 31 to 40.
[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 enhance mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).
According to paragraph 2, which of the following is NOT an effect of social media on mental health?
Thế nào là E-Govermment?
Read the following passage about urbanisation and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.
URBANISATION: A GROWING PHENOMENON
Urbanisation is the process through which cities grow, and higher populations begin to inhabit urban areas. This phenomenon has accelerated significantly over the past few decades due to various factors. One of the primary drivers is the search for better employment opportunities. In rural areas, job prospects are often limited to agriculture and small-scale industries, which might not provide sufficient income. Consequently, people migrate to cities seeking better livelihoods and living standards.
Additionally, urban areas offer more advanced educational facilities and healthcare services compared to rural regions. Many families move to cities to provide their children with higher-quality education and greater future opportunities. Access to hospitals and specialized medical services also attracts people to urban centers, especially in countries where rural healthcare is underdeveloped.
However, rapid urbanisation brings about several challenges. Overcrowding in cities can lead to inadequate housing, strained infrastructure, and increased pollution. The expansion of urban areas often results in the loss of green spaces and agricultural land, impacting food production and the environment. Governments and city planners must address these issues to ensure sustainable urban growth.
Despite these challenges, urbanisation has several positive aspects. Cities are often cultural melting pots, where diverse groups of people interact, leading to vibrant communities and innovation. The concentration of resources and talents in urban areas can drive economic growth and technological advancements.
Which of the following best paraphrases the underlined sentence in paragraph 2?
Trong các hoạt động kinh tế cơ bản không bao gồm hoạt động nào sau đây?
Phát biểu nào phù hợp nhất về khái niệm bit?
Phương án nào sau đây mô tả đúng nhất bản chất của việc số hóa hình ảnh?
Loại phần mềm độc hại nào sau đây tạo ra các thông báo ngoài ý muốn của người dùng?
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions.
The Amazon rainforest is home to more than a third of all the world's species of plants, birds and animals. Twenty per cent of all the birds in the world live in the rainforest. Scientists have discovered thousands of types of plants and animals that can only be found there. There are thousands - probably millions more that we haven't discovered yet. There are at least 2.5 million species of insects there. Imagine what would happen if they all lost their home? It couldn't happen, could it? Unfortunately, it's happening right now. Yet, the rainforest is big. But it's getting smaller. The problem is that people are cutting down the trees, mainly to make room for cows. These provide meat and make money for their owners. This process of cutting down trees is called ‘deforestation'.
The good news is that it is slowing down. In 2004, for example, more than 27,000 square kilometres were cut down. That's an area bigger than Wales. In 2006, because of all the campaigns to save rainforest, it dropped to just over 13,000 square kilometres. The bad news is that it's not enough. Scientists predict that by 2030, the rainforest will have become smaller by 40%. It's possible that by the end of the 21st century, the rainforest will have completely disappeared. With deforestation, thousands of the animals, birds, fish and plants that live in the Amazon rainforest lose their home, their natural habitat. Some of them move to other areas, but most of them die. Many species have already become extinct, and many more will if deforestation continues. That will change the balance of life in the rainforest and could cause enormous problems to the region's ecosystem.
There's another problem too. Trees and plants are a vital source of oxygen. If we cut them down, we lose that oxygen. But it's worse than just that. With deforestation, the trees and plants are burnt. This sends gases into the Earth's atmosphere, which stops some of the Earth's heat escaping. That then leads to the temperature here on the ground going up. This increase in the world's temperature is called 'global warming', and most scientists believe it's a very serious issue. If they stopped deforestation, it might help prevent global warming
Which title best summarises the main idea of the passage?
Một trong những mục đích chính của thực dân Pháp trong quá trình thực hiện cuộc khai thác thuộc địa lần thứ hai ở Đông Dương (1919-1929) là
Phương pháp cơ bản của số hóa âm thanh là gì?
Cao nguyên Trung tâm ở Cộng hòa Nam Phi có độ cao khoảng bao nhiêu?
Khi gọi hàm, dữ liệu được truyền vào hàm được gọi là gì?
Mĩ đã triển khai “Kế hoạch Mác san” nhằm mục đích gì?
