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Sách giáo khoaa cần cải cách vấn đề này, chứ dạy học sinh theo sách mà đáp án lại ra theo thí nghiệm thì căn cứ ở đâu mà chấm? Hồi đó tỉnh em cũng bị cái này :v trong sgk bảo màu vàng :v nhưng thi ra lại là màu nâu đất :v mọi người đều nói là lấy sgk làm căn cứ :))) nhưng người ra đề lấy thực tế và học sinh đều bị trừ câu đó 0,25 đ (trừ mấy người làm sai ^_^). 0,25 đ :))) đủ khiến một vài ai đó rớt tốt nghiệp cấp II và tuyển sinh lớp 10 :v
nói tóm tác vấn đề của cô giáo đã nói :
| muối tạo bởi | bazơ mạnh | bazơ yếu |
| axit mạnh | không đổi màu quì tím | đổi màu quì tím sang màu đỏ |
| axit yếu | đổi màu quì tím sang màu xanh | trường hợp này thì chưa chắc được và độ pH của nó gần bằng 7 |
5. You can speak English fluently, __________?
A. could you | B. can’t you | C. can you | D. couldn’t you |
6. On average, _________Moon is 384.400 km from ___________ Earth.
A. the-the | B. x-the | C. a-an | D. a-the |
7. _________ my opinion, he is the best football player in our team.
A. On | B. At | C. In | D. From |
8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best wishes from their relatives and friends.
A. give | B. send | C. have | D. receive |
9. The driver stopped ______ a coffee because he felt sleepy.
A. have | B. to have | C. having | D. had |
10. I wish I ______ play football well.
A. can | B. could | C. am | D. did |
11. If I ________ you, I would join this English Speaking Contest.
A. were | B. am | C. would be | D. will be |
12. _______ there is a lot of noise in the city, I living there.
A. Because | B. Despite | C. In spite of | D. Although |
13. I suggest ________ a shotcut through the field . It will take much less time.
A. take | B. taking | C. to take | D. takes |
14. She has a lot of ___________ while she’s studying English.
A. difficult | B. difficulties | C. difficile | D. diffident |
15. He finds the way to a place easily. He was a very good sense of ___________
A. direction | B. humor | C. style | D. responsibility |
16. There are lots of people who _____ work in remote and mountainous areas nowadays.
A. volunteers | B. voluntary | C. voluntarily | D. volunteer |
17. If you want to _____ the other students in your class, you’ll have to work very hard.
A. catch up with | B. learn on | C. catch up | D. hurry up |
TRẢ LỜI:
CO - Cacbon monoxit
CO2 - Cacbon đioxit
HNO3 - Axit nitric
Cl2O - Điclo monoxit
B2H6 - Điboran
PH3 - Photphin
PH5 - Photphoran
C6H12 - Xiclohexan
CO : cacbon oxit
\(CO_2\): cacbon đioxit
\(HNO_3\): axit nitric
\(Cl_2O\): điclo monooxxit
\(B_2H_6\): điboran
\(PH_3\): photphin
\(PH_5\): ??? làm g có
\(C_6H_{12}\): xiclohexan
Bài số 1
Mid-Autumn Festival is under the full moon day of the lunar calendar every year in August, over 4,000 years ago. This is the day children’s festival, also known as the “Festival looks Moon”. Children are expected Tet is because adults are often donated toys, usually light. His star, mask, light pull troops … and pies, cakes plas. Besides the Tet Holiday, Mid-Autumn festival is one of the most famous festivals and it is a traditional celebration for Vietnamese children.
In this new year, we organized presentation deck, looks moon. Everywhere is fallen in the active and colorful air. Children are provided with many nice lanterns – star lanterns, flower lanterns and diverse funny masks for special performance in the evening of the full moon. In some areas, people also held dragon dance, lion dance to the children happy. The main point of the Mid-Autumn is that children use the beautiful lanterns, wear funny masks, perform fantas lion dances and sing folklore songs in the house’s grounds or on the streets when the moon is rising.
In Vietnam, Moon cakes are the specific cakes and are only on this festival. Moon cakes, which are made from flavor, dried fruit, meat, egg, pumpkin’s seed, peanut, are so sweet and good tasting. Moon cakes symbolize Luck, Happiness, Health and Wealth on the Mid-Autumn day.
Mid-Autumn celebration is also an opportunity for members of the family to get together and share everything in their year. The young generation express their gratitude to the old generation. The parents show their love for their children. For others, because the traditional time to have this festival is usually after harvesting the crops, it is as the congratulation for the full harvest.
Apart from moon cakes and lanterns, the other most visible tradition related to Mid-Autumn festival is the lion dance. On the nights leading up to the holiday, groups of children parade through the streets – some of the children maintain a martial beat on drums, while others control an extravagantly decorated ‘lion’ crafted from molds and paper.
The children approach homes and businesses and ask the owners for their permission to perform. If they agree, the children put on a show that is believed to bring a blessing of luck and fortune. Afterwards the host gives the children lucky money as a sign of gratitude.
Bài số 2
The Mid-Autumn festival dates back to the Rice Civilization of the Red River delta, over 4,000 years ago. It is held on the 15th day on the 8th lunar month (often in late September or early October) in the middle of autumn and it is celebrated for a whole day. Besides the Tet Holiday, Mid-Autumn festival is one of the most famous festivals and it is a traditional celebration for Vietnamese children.
Children are provided with many nice lanterns - star lanterns, flower lanterns and diverse funny masks for special performance in the evening of the full moon. Everywhere is fallen in the active and colorful air. The main point of the Mid-Autumn is that children use the beautiful lanterns, wear funny masks, perform fantas lion dances and sing folklore songs in the house's grounds or on the streets when the moon is rising.
Moon cakes are the specific cakes and are only on this festival. Moon cakes, which are made from flavor, meat, egg, dried fruit, pumpkin's seed, peanut, are so sweet and good tasting. Moon cakes symbolize Luck, Happiness, Health and Wealth on the Mid-Autumn day.
Apart from moon cakes and lanterns, the other most visible tradition related to Mid-Autumn festival is the lion dance. On the nights leading up to the holiday, groups of children parade through the streets – some of the children maintain a martial beat on drums, while others control an extravagantly decorated 'lion' crafted from molds and paper.
The children approach homes and businesses and ask the owners for their permission to perform. If they agree, the children put on a show that is believed to bring a blessing of luck and fortune. Afterwards the host gives the children lucky money as a sign of gratitude.
Mid-Autumn celebration is also an opportunity for members of the family to get together and share everything in their year. The young generation express their gratitude to the old generation. The parents show their love for their children. For others, because the traditional time to have this festival is usually after harvesting the crops, it is as the congratulation for the full harvest.
- Dòng chứa tất cả các axit là dòng D.
- Tên các axit đó là
- \(H_3BO_3\) - Axit boric
- \(H_2SO_4\) - Axit sunfuric
- \(H_2SO_3\) - Axit sunfurơ
- \(HCl\) - Axit clohydric
- \(HNO_3\) - Axit nitric
Vừa qua nó bị lỗi dòng, cô gửi lại nhé:
Dòng chứa tất cả các chất axit là dòng D.
\(H_3BO_3-\text{Axit boric}\)
\(H_2SO_4-\text{Axit sunfuric}\)
\(H_2SO_3-\text{Axit sunfurơ}\)
\(HCl-\text{Axit clohiđric}\)
\(HNO_3-\text{Axit nitric}\)
Outside of class, students also have to spend a lot of time self-studying and reviewing at home to be able to absorb and remember knowledge most effectively. Self-study is a modern form of learning widely applied because of the efficiency and convenience it brings. On the other hand, self-study also brings many challenges to learners because this form of learning requires a very high level of discipline and self-discipline. So why does self-study bring any benefits and what is an effective self-study method?
Each student has a different learning method to suit your personality. There are students who feel more focused when studying and listening to music, but there are also students who prefer a quiet study space. In addition, you can choose diverse learning methods that suit you such as drawing mind maps, learning through images, videos,... when spending time studying on your own. Not only that, students can study at an appropriate pace, spending time learning deeply about the issues they care about.When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
Building a suitable self-study schedule for yourself will be the foundation for building a good habit for students. When studying on their own, students will be trained to be proactive and develop problem-solving skills because they need to proactively explore learning materials as well as find solutions to their questions. In addition, self-study means that students need to proactively arrange their time appropriately, this will help them form habits as well as self-discipline in learning.
Self-study requires high self-awareness and perhaps for many of you, this is the biggest challenge to overcome. Therefore, students should build a timetable suitable to their personal schedule, dividing time for studying, entertainment and time for other work. Note, you should allocate appropriate time so that your body does not fall into a state of fatigue and exhaustion, as well as choose the time when you feel you can concentrate best to study.
After having a suitable timetable, students should avoid the habit of procrastination and adhere exactly to the timetable they set to achieve the best results.
Outside of class, students also have to spend a lot of time self-studying and reviewing at home to be able to absorb and remember knowledge most effectively. Self-study is a modern form of learning widely applied because of the efficiency and convenience it brings. On the other hand, self-study also brings many challenges to learners because this form of learning requires a very high level of discipline and self-discipline. So why does self-study bring any benefits and what is an effective self-study method?
Each student has a different learning method to suit your personality. There are students who feel more focused when studying and listening to music, but there are also students who prefer a quiet study space. In addition, you can choose diverse learning methods that suit you such as drawing mind maps, learning through images, videos,... when spending time studying on your own. Not only that, students can study at an appropriate pace, spending time learning deeply about the issues they care about.When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
When studying on their own, students are completely proactive in choosing study times that suit their schedules and personal habits. For example, there are students who feel they concentrate better in the evening, but on the contrary, there are also students who feel that morning is the right time to study. In addition, each student has a different free time budget and students are completely proactive in choosing self-study time that suits their personal needs.
Building a suitable self-study schedule for yourself will be the foundation for building a good habit for students. When studying on their own, students will be trained to be proactive and develop problem-solving skills because they need to proactively explore learning materials as well as find solutions to their questions. In addition, self-study means that students need to proactively arrange their time appropriately, this will help them form habits as well as self-discipline in learning.
Self-study requires high self-awareness and perhaps for many of you, this is the biggest challenge to overcome. Therefore, students should build a timetable suitable to their personal schedule, dividing time for studying, entertainment and time for other work. Note, you should allocate appropriate time so that your body does not fall into a state of fatigue and exhaustion, as well as choose the time when you feel you can concentrate best to study.
After having a suitable timetable, students should avoid the habit of procrastination and adhere exactly to the timetable they set to achieve the best results.
1. Hand-written homework.
=> It can prevent students from copying the answer from Internet but it is also inconvenient and time-consuming. Especially, students that have bad hand-writing can get bad mark just because teacher cannot understand what they wrote. Therefore, I don't want to preserve it.
2. Playing traditional games hide and seek, elas-band jumping, skipping and catch the chickens.
=> I want to preserve it because it's also a good physical activity for children that helps them to be healthier and shape.
3. Obeying your parents/teachers without talking back.
=> I don't want it to be preserved. Sometimes, children should be allowed to speak up, to give their opinions so that parents can understand their children more.
tham khảo
Lấy mẫu các dung dịch rồi tiến hành đun nóng
- Xuất hiện kết tủa trắng, có bọt khí => Mg(HCO3)2 hoặc Ba(HCO3)2 (nhóm I)
Mg(HCO3)2 to→to→ MgCO3↓↓ + H2O + CO2↑↑
Ba(HCO3)2 to→to→ BaCO3↓↓ + H2O + CO2↑↑
- Xuất hiện bọt khí => KHCO3
2KHCO3 to→to→ K2CO3↓↓ + H2O + CO2↑↑
- Ko xảy ra hiện tượng gì => NaHSO4 hoặc Na2CO3 (nhóm II)
Làn lượt cho các chất ở nhóm I tác dụng với nhóm II
Ở thí nghiệm vừa tạo kết tủa và khí => chất ở nhóm I là Ba(HCO3)2, chất ở nhóm II là NaHSO4
Ba(HCO3)2 + NaHSO4 -> BaSO4↓↓ + CO2↑↑ + H2O + Na2CO3
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