Thành phần chính của thạch cao là CaSO4.Tên của hợp chất này là
Câu hỏi liên quan
Choose the word(s) OPPOSITE in meaning to the underlined word(s).
Many women prefer to use cosmetics to enhance their beauty and make them look younger.
Trong các câu sau, có bao nhiêu câu là mệnh đề?
(1): Số là một số chẵn.
(2): .
(3): Các em hãy cố gắng làm bài thi cho tốt.
(4): .
Cá rô phi nuôi ở Việt Nam có giới hạn sinh thái về nhiệt độ từ 5,6°C đến 42°C. Nhiệt độ 5,6°C gọi là
Read the following passage about the Science in Service of Humanity 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.
Science has come out of its shell in laboratories to become a powerful force for human advancement. Modern scientific endeavors increasingly focus on addressing real-world challenges affecting communities globally. From developing vaccines that save millions to creating technologies connecting people across continents, science serves humanity in countless ways. This shift represents a fundamental evolution in how we perceive scientific progress—not merely academic pursuit but a practical tool for improving lives and solving pressing problems.
[I] Medical breakthroughs exemplify how science directly benefits humanity. [II] For instance, gene therapy offers hope for those with inherited conditions, while artificial intelligence helps diagnose diseases earlier and more accurately. [III] These advancements didn't happen overnight; scientists had to burn the midnight oil for years before achieving success. [IV] Their perseverance demonstrates that when science targets humanitarian goals, results can transform society profoundly.
Environmental science has emerged as another crucial domain where laboratory work translates into human welfare. Climate scientists provide data informing policy decisions affecting billions. Conservation biologists develop strategies to protect biodiversity, ensuring future generations benefit from natural resources. Agricultural researchers create drought-resistant crops helping communities withstand changing climate conditions. Despite these contributions, environmental science faces challenges including funding limitations, political resistance, and urgency of addressing accelerating climate change. Nevertheless, dedicated scientists continue their work, recognizing environmental health directly impacts human wellbeing.
The future of science in service of humanity looks increasingly collaborative and inclusive. Modern approaches incorporate diverse perspectives, including indigenous knowledge and community participation. Citizen science projects engage non-professionals in data collection, democratizing the scientific process. Open-access publishing makes research findings available to anyone with internet access, not just wealthy institutions. These developments suggest science's greatest potential lies in becoming more accessible and responsive to human needs. As we face complex global challenges, from pandemics to climate change, science serving humanity offers our best hope for a sustainable future.
Which of the following is TRUE according to the passage?
Để nhận biết quá trình thoát hơi nước ở lá, chúng ta cần sử dụng loại giấy có tẩm hóa chất nào dưới đây?
Cho hình chóp \(S. A B C\) với \(M, N, P\) lần lượt là trung điểm các cạnh \(B C, A C, A B\) và thỏa mãn: \(S M=N P, S N=M P, S P=M N\).
Mặt phẳng \((\alpha)\) chứa \(M N\) và đi qua trung điểm của \(S P\), cắt \(S A, S B\) lần lượt tại \(E\) và \(F\). Tỉ số \(\frac{M F}{N E}\) bằng
Hợp chất hữu cơ X là thành phần không thể thiếu trong cấu trúc và hoạt động của mọi tế bào sống. X có mặt trong tất cả các tế bào sống và đóng vai trò quan trọng trong các chức năng sinh hóa, điều hòa chức năng các mô cơ quan trong cơ thể. Hợp chất hữu cơ X là
a. Sleep is essential for mental and physical well-being, providing numerous benefits to our health.
b. People who do not get enough sleep may suffer from issues such as irritability, poor concentration, and weakened immune function.
c. By allowing the body to rest and the mind to refresh, sleep plays a key role in daily functioning, helping us stay focused and productive.
d. Additionally, insufficient sleep can lead to weight gain and increase the risk of chronic diseases such as heart disease and diabetes.
e. Therefore, ensuring sufficient sleep is vital for improving productivity, mood, and overall quality of life.
Biết rằng mùi tanh của cá (đặc biệt là cá mè) là hỗn hợp các amine và một số chất khác. Để khử mùi tanh của các trước khi nấu chúng ta có thể sử dụng dung dịch chất nào dưới đây?
Một sóng âm truyền từ không khí vào nước thì
Hoạt động tạo ra sản phẩm vật chất và tinh thần quyết định tạo ra sản phẩm vật chất và tinh thần quyết định sự tồn tại phát triển của con người và xã hội gọi là gì?
Cho tứ diện ABCD. Gọi G là trọng tâm tam giác ABD. Trên cạnh BC lấy điểm M sao cho MB = 2MC. Chọn khẳng định đúng:
Một chiếc thuyền xuôi dòng sông từ A đến B hết 2 giờ 30 phút. Khi quay ngược dòng từ B đến A mất 3 giờ. Vận tốc của nước so với bờ sông và vận tốc của thuyền so với nước là không đổi. Tính thời gian để một khúc gỗ tự trôi từ A đến B là bao nhiêu?.
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
[I] A newborn baby can see, hear and feel. By the age of five, a child can talk, ride a bike and invent imaginary friends. How does this development happen? [II]We don't understand the way language, thinking and planning develop very well. [III]Now scientists are using new technology to ‘see’ into children's brains. And they are discovering new information about the way a baby's brain develops. [IV]
A study in 2010 showed that children who were afforded more focus often gained an edge in IQ. The brain of a newborn infant contains nearly a hundred billion neurons. This number is comparable to that of an adult's brain. As they mature, an infant assimilates information through the sensory modalities of sight, hearing, smell, taste, and touch. This information fosters intricate connections between different regions of the brain. By the age of three, there are approximately a hundred trillion synaptic connections.
One experiment looked at images of babies' brains while they were listening to different sounds. The sounds were in different sequences. For example, one sequence was mu-ba-ba. This is the pattern ‘A-B-B’. Another sequence was mu-ba-ge. This is the pattern ‘A-B-C’. The images showed that the part of the brain responsible for speech was more active during ‘A-B-B’ patterns. This shows that babies can tell the difference between different patterns. This experiment is interesting because sequences of words are important to grammar and meaning. Compare two sentences with the same words in a different order: ‘John killed the bear’ is very different from ‘The bear killed John.’ So babies are starting to learn grammatical rules from the beginning of life.
Researchers also know that babies need to hear a lot of language in order to understand grammar rules. But there is a big difference between listening to television, audiobooks or the internet, and interacting with people. One study compared two groups of nine-month-old American babies. One group watched videos of Mandarin Chinese sounds. In the other group, people spoke the same sounds to the babies. The test results showed that the second group could recognize different sounds, however, the first group learned nothing. The scientist, Patricia Kuhl, said this result was very surprising. It suggests that social experience is essential to successful brain development in babies.
According to paragraph 3, which of the following is NOT a finding of the sound sequence experiment?
Hình thức hô hấp chủ yếu ở thực vật là
Ngành dịch vụ ở nước ta hiện nay
Nguyên tố nào sau đây không thuộc nhóm halogen?
Cho mạch logic như hình sau:
Read the following passage about love and mark the letter A, B, C, or D to indicate the best answer to each of the following questions from 23 to 30.
Love in 36 questions
Although couples will rarely believe it, scientific factors have a lot to do with falling in love. Research has shown that scent plays an important role in choosing a mate. Other experiments have demonstrated that love is caused by combinations of chemicals in the brain. Furthermore, New York psychologist Arthur Aron applied the principles of science to demonstrate that the process of falling in love could be speeded up to just 45 minutes!
Some scientists claim that we take between 90 seconds and four minutes to determine if we’re attracted to someone. However, the leap from being attracted to someone to falling in love with them is a big one, and Aron wanted to find out if the closeness associated with feelings of being in love could be created artificially.
Aron produced a paper that included 36 questions designed to encourage intimacy if couples answered them together. The questions came in three sets with each set covering increasingly intimate ground. They covered many personal opinions and experiences; for example, “Would you like to be famous?”, “What does friendship mean to you?” and “When did you last cry in front of another person?”. After answering the questions together, the couples were directed to stare into each other’s eyes for four minutes without saying anything.
Aron tested his questions on pairs of strangers and then asked them to stare at each other. All of the participants reported feeling close to their partners and many of them swapped contact details after the experiment. So if you’re keen on someone and would like to get closer to them, it would seem that Aron’s questions could help you to achieve your objective.
Which of the following is NOT true according to the passage?
a. Mark: Yeah, I really needed to relax after such a stressful week at work.
b. Alice: Did you do anything fun this weekend, Mark?
c. Alice: I’m glad to hear that! What did you do?
d. Mark: I went hiking in the mountains. The fresh air was amazing.
e. Alice: That sounds like a perfect way to unwind!
