Trong hợp chất hữu cơ ý ạ, nếu có cả liên kết đôi, liên kết ba, mạch nhánh, nhóm chức thì gọi tên như nào ạ? Ưu tiên đánh số mạch cacbon chính từ phía nào trước?

Làm sao để đặt câu hỏi nhạc Vẽ mầm thắc mắc (nhớ có tâm)

Giúp mình với ạ, mình cảm ơn nhìuu

II. Read the text carefully then answer the questions. Community service is work done by a person or group of people that benefits others. It is often done near the area where you live, so your own community gets the benefits of your work. You do not get paid to perform community service, but get to learn a lot. Community service can help many different groups of people, even animals and the environment. Community service is often organized through a local group, such as a place of worship, school, or non-profit organization, or you can start your own community service projects. Community service can even involve raising funds by donating used goods or selling used goods like clothing. Many people participate in community service because they enjoy helping others and improving their community. 1. What is community service? 2. Where is community service often done? 3. Is community service a paying job? 4. What groups of people can community service help? 5. Is donation of used goods a community service example? 6. Why do many people take part in community service?

rút gọn các biểu thức sau: a, 81^2nhân32^7/2^32 và 27^9 b, 729^2nhân1024^2/6^18nhân2^2

Cho 31,7 gam hỗn hợp gồm C2h5oh,C6H5oh,Ch3cooh tác dụng với Na thu được 0,225 mol H2 mặt khác 31,7 gam hỗn hợp trên cần dùng dùng 300 ml dung dịch NaOH 1M tính phần trăm khối lượng mỗi chất trong hỗn hợp

Giúp mk 2 bài này vs ạ Cảm ơn mn nhiều

Trắc nghiệm ạ Nhanh giúp mk vs Camon

I. Fill In each blank with a word from the box. Many people (1) ___________ in their communities. Some people work with children or the elderly (2) ___________ others clean city parks. Some student clubs require their members to participate in a certain number of hours of community (3) ___________ every month. One way that communities work (4) ___________ is by raising funds for those in need. A community might raise (5) ___________ for a school to buy new equipment or uniforms by selling baked goods or holding a yard sale. Many communities provide places for people in need to receive food, (6)___________, or shelter. Volunteering can help people feel like they are giving something (7) ___________ to their communities. Sometimes a person may need help at one time (8) _________ be able to help others later

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