Biết phản ứng đốt cháy khí carbon monoxide (CO) như sau:

CO (g) + O2 (g) ⟶ CO2 (g)                     \({\Delta _r}H_{298}^0 = - 283,0kJ\)      

Ở điều kiện chuẩn, nếu đốt cháy hoàn toàn 2,479 L khí CO thì nhiệt lượng toả ra là bao nhiêu?

Đầu ra của hệ thống kĩ thuật có:

Cho các yêu cầu xây dựng chuồng nuôi cần đảm bảo dưới đây:

(1) Vị trí cao ráo, thoáng mát, thoát nước tốt, xa khu dân cư, chợ, trường học,… 

(2) Tính toán phù hợp với quy mô chăn nuôi.

(3) Đầy đủ, phù hợp với đối tượng vật nuôi và từng giai đoạn.

(4) Cao 3 – 4 m để đảm bảo thông thoáng.

(5) Đảm bảo đủ diện tích cho từng con vật nuôi.

Trong các yêu cầu xây dựng chuồng nuôi trên, những yêu cầu xây dựng chuồng nuôi nào cần đảm bảo về mặt bằng xây dựng?

Cấp độ tổ chức sống nào sau đây được xem là cấp độ tổ chức sống cơ bản nhất?

Công việc của kiến trúc sư xây dựng là gì?

Read the following passage about managing change 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. 

Growing up in Athens, Greece, Lydia Borsi remembers feeling tested when she tried to deal with mental health issues. Borsi says she had been seeing a therapist for anxiety. But she notes that people in Greece do not openly discuss mental health issues, which also get little attention in general healthcare services. “It was a lot more secretive. And people thought that I was a lot more unique,” Borsi said.

That all changed in 2017 when she moved to the United States to study at the University of Rochester in Rochester, New York. “When I came here, I really liked that people were not afraid to speak up about mental health and say that it’s important,” she said. The university was very supportive of her needs and offered plenty of information. She also became involved with a school group called Active Minds that helps students deal with mental health issues. [A]

Then due to the spread of the novel coronavirus, the University of Rochester had to move all its classes and some of its mental health resources online. Luckily, Borsi was able to connect with a mental health expert outside the school, in the local community. [B]

But as many of her American friends returned home, Borsi was stuck. Greece had succeeded in limiting the spread of the virus within its borders, but flights there from the U.S. are barred until July. Also, the health crisis has put her plans to seek admission to medical school in Britain on hold. [C] And she is not alone.

[D] In April, Active Minds launched a survey of over 2,000 students at U.S. colleges and universities. The study found that over 80 percent of those asked said the coronavirus crisis had negatively affected their mental health. One in five said it has affected them severely.

Laura Horne, chief program officer at Active Minds, says the findings are especially troubling given that the crisis is only going to make it harder for colleges and universities to help these students. “Colleges and universities had to pivot rather quickly to respond to COVID-19 and figure out all facets of university life, including mental health services. Now they have to figure out how to communicate with students,” Horne said.

Frank Chen is a Houston, Texas-based psychiatrist who has worked with college-age young adults. He points out that individuals at that age are in an important stage of their mental development. And college can be a difficult experience for students with or without mental health issues, as they balance work, studies, and personal relationships. Adding a major world event, like the spread of the coronavirus, makes it very difficult to predict what the long-term psychological effects might be. “I don’t think that there’s another event in the history of the people who are alive now that can really measure up to this,” said Chen.

The word ‘they’ in paragraph 6 refers to

Khi thực hiện khảo sát dao động của con lắc đơn, một học sinh đo được kết quả vào biểu diễn trên đồ thị hình vẽ. Tuy nhiên, do sơ suất nên lại không kí hiệu các đại lượng lên trên trục tọa độ. Hãy xác định các đại lượng trên trục Ox và Oy.

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?

Tiến hành mạ bạc cho một huy chương bằng kim loại đồng (copper) theo sơ đồ minh họa bên.

Phát biểu đúng là:

Trường hợp nào sau đây là hành vi cạnh tranh không lành mạnh?

Read the following leaflet 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 7 to 12.

STAY SAFE: UNDERSTANDING SCAMS AND HOW TO PREVENT THEM

What is a scam?

A scam is a deceptive scheme delivered through digital communications with the intent to steal money or personal information. These schemes take many forms, including online fraud, phishing emails, and fake lotteries. In (7) _____ words, scams are tricks that prey on your trust and can lead to significant financial loss.

Common types of scams

-          Phishing: fraudulent emails or messages that appear to be from legitimate sources, tricking you into (8) _____ personal information.

-          Lottery scams: notifications claiming you’ve won a (9) _____, requiring you to pay a fee to claim it.

-          Other scams: these can include fake charities, advance-fee scams, and online auction fraud, each designed to exploit individuals in different ways.

Tips to prevent scams

-          Verify sources: always check the (10) ____ of requestions for personal information.

-          Root out suspicious communications: don’t engage with unknown contacts and report any suspicious emails or calls to the authorities (11) _____ potential scams.

-          Protect your information: use strong passwords and enable two-factor authentication on your accounts to add an extra (12) ______ of security.

Thể tích công tác càng lớn thì công suất của động cơ:

Khi phân tích một hợp chất, người ta phát hiện thấy hợp chất này có 6 nguyên tử carbon và tỉ lệ các nguyên tử carbon, hydrogen, oxygen là 1 : 2 : 1.

Vì sao cần tiêu dùng hợp lí, có kế hoạch?

Nguyên nhân chủ yếu dẫn đến hai cuộc chiến tranh thế giới trong thế kỉ XX là do

Cơ cấu vốn đầu tư vào Đông Dương trong cuộc khai thác thuộc địa lần thứ nhất, thành phần kinh tế nào chiếm tỉ trọng lớn nhất?

Read the passage carefully. Choose an option (A, B, C, or D) that best answers each question from 41 to 45.

1. It is estimated that about 40 per cent of the world's population use social media, and many of these billions of social media users look up to influencers to help them decide what to buy and what trends to follow. An influencer is a person who can influence the decisions of his or her followers because of his or her knowledge or special knowledge in a particular area, e.g. fashion, travel, or technology. Influencers are now seen by many companies as a direct way to customers' hearts. Brands are now asking powerful influencers to market their products. With some influencers charging up to $25,000 for one social media post, it is no surprise that more and more people are keen to become influencers, too. If you are one of them, then here are five tips on how to do it.

2. Choose your niche: What is the area that you know most about? What do you feel most excited talking about? Find the specific area that you are most interested in and develop it.

3. Choose your medium and write an interesting bio: Most influencers these days are bloggers and micro-bloggers. Decide which medium – such as your own online blog, Instagram or Snapchat – is the best way to connect with your followers and chat about your niche area. When you have done that, write an attention-grabbing bio that describes you and your speciality area in an interesting and unique way. Make sure that people who read your bio will want to follow you.

4. Post regularly and consistently: Many influencers post daily on their social media accounts. The more you post, the more likely people will follow you. Also, make sure that your posts are consistent and possibly follow a theme.

5. Tell an interesting story: Whether it is a photo or a comment that you are posting, use it to tell a story that will catch the attention of your followers and help them connectwith you.

6. Make sure people can easily find your content: Publicize your posts on a variety of social media by hashtags and catchy titles to make sure that they can be easily found. There is no point writing the most exciting blogposts or posting the most attractive photographs if no one is going to see them.

7. Most importantly, if you want to become a social media influencer, you need to have patience. Keep posting and your following will gradually increase. Good luck!

What can be inferred from paragraph 3?

Yếu tố tự nhiên tác động tới điều gì?

Một người đạp xe quãng đường 2 km từ nhà đến siêu thị trong 10 phút, rồi từ siêu thị đến hiệu sách cách đó 3 km trong 18 phút. Tốc độ trung bình của người đó trên cả quãng đường là

Trong chất nào dưới đây, các phân tử có khoảng cách gần nhất?