Hình vẽ thể hiện nhiệt kế đo nhiệt độ t1(0C) và t2(0C) của một dung dịch trước và sau khi đun. Hãy xác định và ghi kết quả độ tăng nhiệt độ t của dung dịch này.
Hình vẽ thể hiện nhiệt kế đo nhiệt độ t1(0C) và t2(0C) của một dung dịch trước và sau khi đun. Hãy xác định và ghi kết quả độ tăng nhiệt độ t của dung dịch này.
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- Nhiệt kế 1 (trước khi đun): $t_1 = 27,0 ^0C$
- Nhiệt kế 2 (sau khi đun): $t_2 = 71,0 ^0C$
$t = t_2 - t_1 = 71,0 - 27,0 = 44,0 ^0C$
ĐCNN (độ chia nhỏ nhất) của nhiệt kế là $1,0 ^0C$, do đó sai số dụng cụ là $\pm 1,0 ^0C$.
Vậy kết quả đo là: $t = 44,0 \pm 1,0 ^0C$
Câu hỏi liên quan
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Đáp án nào dưới đây là cách viết khác với mệnh đề đã cho?
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d. Eric: I just wish I had more privacy.
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Khi cho dung dịch sodium choride bão hoà đến dư vào dung dịch copper(II) sulfate loãng, chỉ thấy dấu hiệu nhạt màu, không thấy dấu hiệu dung dịch chuyển sang màu khác.
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Khi một vật đặt ở độ cao h so với mặt đất thì sẽ lưu trữ năng lượng dưới dạng thế năng.
Trình tự nào sau đây thể hiện đúng tiến trình nghiên cứu môn Sinh học?
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a. Finally, difficulties in communication and forming genuine connections due to social media and technology dependence are common among teens.
b. Additionally, cyberbullying and online harassment present significant challenges in the digital age.
c. Teens often face various social challenges.
d. Firstly, peer pressure can lead to risky behaviors such as substance abuse, smoking, or involvement in harmful activities.
e. Moreover, mental health issues, including anxiety and depression, are prevalent among teenagers due to academic stress or social pressures.
Đối với xã hội hiện nay, môn Địa lí có vai trò nào sau đây?
Read the following passage about endangered languages 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.
AVICII’S LIFE AFTER REHAB
Once he completed his month in rehab, Avicii seemed to have a new outlook on life. He was meditating regularly, reading about the collective unconscious, and got a puppy. After not performing for a long period of time, he returned to the stage in 2016 at Miami’s Ultra Music Festival. It was announced a few days after this gig that he would not be performing live anymore. Avicii chose to not perform so that he could focus on bettering his mental health.
Despite appearing to have new-found stability, Avicii still struggled to deal with his mental health issues. While continuing to suppress the anxiety and depression that he frequently felt, Avicii also started to become disinterested in his music career. During this time, he was smoking and drinking on occasion which may have resulted in a resurgence of his disassociation feelings.
He told Tereza Kacerova, his girlfriend at the time, “What if everyone around me is just a projection in my mind? Sometimes I just think these things. About how nothing really matters.”
Avicii started to focus heavily on meditation which he found to be helpful in clearing the “nonsense” from his mind. He believed that a deep form of meditation taught by Maharishi Mahesh Yogi was a way to exercise his brain which he had decided would lead to his happiness. Despite this form of meditation typically being done in 20 minutes increments, Avicii would sometimes spend full days meditating in an attempt to reach enlightenment faster.
The word suppress in paragraph 2 is closest in meaning to
Các phát biểu dưới đây là đúng hay sai khi nói về vai trò của sinh học?
Với x thuộc tập hợp nào dưới đây thì đa thức \(f(x) = x^2 – 6x + 8\) không dương?
Một xe tải chạy với tốc độ 45 km/h và vượt qua một xe máy đang chạy với tốc độ 38 km/h. Vận tốc của xe máy so với xe tải bằng bao nhiêu?
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 best paraphrases the underlined sentence in paragraph 4?
Ở khoai lang, cây con được sinh ra từ cơ quan nào?
Read the following passage about powering 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.
As we continue to face the impacts of climate change, having a green environment has become increasingly important to the future of our society. To achieve this, the world is shifting towards green energy, and two particular types of energy at the centre of this movement are solar power and wind power.
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Wind power, on the other hand, involves converting the energy of the wind into electricity using large turbines. Wind power doesn’t produce any greenhouse gases, but it is not ideal for private use since turbines require consistent care. However, wind farms can be installed on a large scale and are able to produce electricity continuously regardless of the time of day. This means that if there were more investments in wind power, it could be a viable way to provide energy for major cities and even for whole regions.
Wind and solar power contribute significantly to a green environment by reducing our reliance on fossil fuels, helping us cut down on pollution and slow climate change. Additionally, using renewable energy sources helps promote spending on sustainable development by creating new career opportunities in the green energy sector.
For now, the biggest challenge of adopting green energy is the costs associated with installation and infrastructure, but the benefits unquestionably outweigh the downsides. If we want to stop the climate crisis and create a better and more sustainable future, green energy sources will undoubtedly be the key.
The phrase shift towards in paragraph 1 could best be replaced by ______.