Cho 5,6 g Fe vào 100ml dung dịch NaNO3 NaNO3 2M. Thêm tiếp vào hổn hợp 500ml dung dịch HCl 1M. Khuấy đều cho phản ứng xảy ra hoàn toàn thấy sinh ra một khí duy nhất. Nồng độ H+ trong dung dịch sau phản ứng là

tìm x y z biết a)x^2+3y^2+2z^2-2x+12y+4z+15=0 b)3x^2+y^2+z^2+2X-2y+2xy=0 c)x^4-2x^3+10x^2-20x=0 d)x^2(x-2)+8X-8x-2x^2=0

Giải bài toán thực tế sau: Bóng của 1 cột cờ vuông góc với mặt đất dài 12m , góc nhìn của mặt trời so với phương nằm ngang của mặt đất là 35' . Tính chiều cao của cột cờ.(làm tròn số đo độ dài đến chữ số thập phân thứ nhất)

TEST 2 A.LISTENING (2POINTS) I. Listen to the interview with an ironman. Tick (v) the problems he had as a child. 1. headache 2. stomachache 3. toothache 4. allergy 5. sick 6. running nose 7. weak 8. sunburn II. Listen to the interview with an ironman again and decide the following sentence true (T) or false (F). 1. He wanted to do sports because of his friends 2. Taking up sports was easy 3. He did more exercise. 4. In this even, you swim, run and climb. 5. This even uses more than 6000 calories B. VOCABULARY AND STRUCTURES : (4 POINTS) I. Phonetics : Odd one out (1 point) 1. A. guess B. big C. sign D. again 2. A. again B. allergy C. organization D. gardening 3. A. burn B. singer C. away D. colour 4. A. cupboard B. fisherman C. carrot D. bird II. Complete the sentences with appropriate hobbies. (1 point) 1. If you have a lot of bottles, dolls or stamps, your hobby is……………….. 2. If you spend time watching birds in nature, your hobby is ……………….. 3. If you spend most of your free time making vases or bowls from clay, your hobby is ……………….. 4. If you enjoy moving your body to music, your hobby is ……………….. III. Complete the sentences with the words given : (1point) and but or so 1.I feel tired, ………………..I feel week. 2. The Japanese eat healthily, ……………..They live for a long time. 3. I want to eat ice-cream ,…………..….I have a sore throat 4. You should eat less fast food ,…………..…….you can put on weight . III. Supply the correct tenses of the verbs in brackets : (1point) 1. I enjoy (fish) ................................. because it (be) ……….… relaxing. 2. Jane will play chess after she (finish) …………………………. school. 3. What …………………… your mother often (do) ………………………at weekends? C. READING : (2 POINTS) Each country has many people who voluntarily take care of others. Many students in the USA often spend many hours as volunteers in hospitals, orphanages or nursing homes. They read books to the people in these places. Sometimes the students just visit them , play games with them or listen to their problems . For boys who no longer have fathers, there is a voluntary organization called Big Brothers. Students take these boys to baseball games and help them to get to know things that boys usually learn from their fathers . Some other students take part in helping disabled children . They give care and comfort to them to help them to overcome their difficulties. During summer vacations , they volunteer to work in remote or mountainous areas to provide education for children Volunteers believe that some of the happiest people in the word are those who help to bring happiness to others. 1.What do volunteers do for the people in hospitals , orphanages and nursing homes? A. do their shopping B. read books , play games or listen to their problems C. clean up their houses 2. Big Brothers is A. the name of a club B. a home for children C. an organization for boys who no longer have fathers. 3. Volunteer believe that A. they are unhappy B. the happiest people are those who are young and healthy C. bringing hapiness to others makes them the happiest people 4. Which sentence is not True A. Volunteers don’t provide classes for children B. Volunteers help disabled children to overcome their difficulities. C. Volunteers help the elderly in nursing homes. D. WRITING : (2POINTS) I. Rewrite the sentences, so that their meaning stays the same ,using the beginning (1point) 1. Her hobby is collecting dolls → She enjoys……………………………………………………………………….. 2. Because it’s not good for her health, Ngoc hates fast food. → …………………………….., so ………………………………………… II. Make sentences using the words and phrases given. (1point) 1. Getting / plenty/ rest / really/ important/. ………………………………………………………………………….. 2. It / easy / get/ flu /. / we / should/ try / keep/ clean/ more. ………………………………………………………………………….. Làm hộ e vs ạk

Nêu tên các đới cảnh quan tự nhiên Châu Á và cho biết tại sao các đới cảnh quan tự nhiên Châu Á lại có nhiều đới cảnh quan như vậy

Cho hỗn hợp A gồm Na, Al vào nước dư. Sau khi p/ư kết thúc thu đc 4.48l H2 (dktc), dd A và 1 chất rắn k tan. Cho chất rắn k tan p/ư vừa đủ vs dd H2SO4 loãng đc dd B và 3,36 l khí H2(dktc). Lấy dd A xửa lí = CO2, lấy dd B xử lí = NH3 đều thu đc 1 loại kết tủa. Nung kết tủa thu đc 1 chất rắn a. Viết PTHH b. Tính khối lượng các chất trong hỗn hợp ban đầu

a,√(2x+3) ²=4 b, √9x-5 √x=6-4√x giúp em với ạ mai em kt một tiết

Hãy nêu một số việc làm thể hiện tình hữu nghị với bạn bè và người nước ngoài trong cuộc sống hằng ngày p/s: ko chép mạng

Trả lời giúp e vs ạk Name : …………………………. THE FIRST FORTY-FIVE MINUTE TEST Class : Subject : English A.Phonetic.(1 marks) Write 2 words with each letters as examples. 1./ɜː/ : hurt ;………........................................ 2./ə/ : common ;…………................................ 3./f/ : fat ;.......................................................... 4./v/ : vase ;…………….................................... B. VOCABULARY AND STRUCTURES : (3,5POINTS) I. Phonetics : Odd one out (0,75point) 1. A . calorie B. musical C. cinema D. community 2. A. again B. allergy C. organization D. gardening 3. A.burn B. singer C. away D. colour II. Use the correct word or phrase for each description , begin with the given letter: (0,75point) Description Word / Phrase 1. A thing you like doing and you spend a lot of time on it. H…………………… 2. Give things to help people in need D…………………… 3. People living in an area C…………………… II. Complete the sentences with the words given : (1point) and because but or 1.Don’t read in bed ………………..….it is harmful for your eyes. 2. The Japanese eat a lot of rice ,………..…they eat lots of fish ,too 3. I want to eat ice-cream ,…………..….I have a sore throat 4. You should eat less fast food ,…………..…….you can put on weight . III. Supply the correct tenses of the verbs in brackets : (1point) 1. My brother( collect)…………………………… stamp when he was a child . 2. I enjoy fishing because it (be )……..…………interesting. 3. …………………..you ( finish)…………………your homework yet ? 4. Don’t worry we (go ) …………………..swimming with you tomorrow . C. READING : (2,5POINTS) I. Match the health problems with its tip : (1,5 points) Health problem Tip Answers 1. I’m so tired a. Spend less time playing computer games. 1……. 2. I have spots b. Wash your hands regularly 2…… 3. My eyes are dry c. Keep your body warm and eat a lot of garlic 3……. 4. I feel weak and sick d. Go to bed and rest 4…… 5. It’s easy to get flu . What should I do? e. Eat more and get more exercises too 5….. 6. I want to stay in shape. What will I do? f. Eat less junk food , and exercise more 6……. II. Read the passage and choose the best option (A, B or C):(1point) Each country has many people who voluntarily take care of others. Many students in the USA often spend many hours as volunteers in hospitals, orphanages or nursing homes. They read books to the people in these places. Sometimes the students just visit them , play games with them or listen to their problems . For boys who no longer have fathers, there is a voluntary organization called Big Brothers. Students take these boys to baseball games and help them to get to know things that boys usually learn from their fathers . Some other students take part in helping disabled children . They give care and comfort to them to help them to overcome their difficulties. During summer vacations , they volunteer to work in remote or mountainous areas to provide education for children Volunteers believe that some of the happiest people in the word are those who help to bring happiness to others. 1.What do volunteers do for the people in hospitals , orphanages and nursing homes? A. do their shopping B. read books , play games or listen to their problems C. clean up their houses 2. Big Brothers is A. the name of a club B. a home for children C. an organization for boys who no longer have fathers. 3. Volunteer believe that A. they are unhappy B. the happiest people are those who are young and healthy C. bringing hapiness to others makes them the happiest people 4. Which sentence is not True A. Volunteers don’t provide classes for children B. Volunteers help disabled children to overcome their difficulities. C. Volunteers help the elderly in nursing homes. D. WRITING : (3POINTS) I. Rewrite the sentences, so that their meaning stays the same ,using the beginning (1point) 1. Her hobby is raising money for the poor → She enjoys…………………………………………………………………………………….. 2. Because he was tired , he went to bed early → He ……………………………….., so ………………………………………… II. Write full sentences using the suggested words and phrases given : (1point ) 1. They / visited / Ha Long Bay / many times . ……………………………………………………………………………………….. 2. My brother / not like / ice-skating / because he thinks / it/ dangerous . ………………………………………………………………………………….. III.Writing (1pt) :Rearrange the words to form the sentences about healthy living. 1. apple/keeps/An/day/doctor/ a/ the/ away……………… …..………………. 2. sleep/ are/ the/ cures/ A/ good/ and/ best/ laugh/ a/ long.………… ……… ………… 3.eat/ not/ live/ Eat/ to / live/ to/,/…………………………………………. 4.thirds/ health/ Hygiene/ two/ of/ is.…………………………………… ………………. 5.good/ eat/ cheerfully/ To/ health/ :/ lightly/ ensure/and/ laugh.…… ………………

Tổng hai số lẻ liên tiếp bằng 180.tìm hai số đó