Cho 0,12 mol ancol etylic tác dụng với 0,15 mol axit axetic ( có xúc tác). Biết hiệu suất pư là 60% , khối lượng este thu được là: A 7,92g. B 6,33g C 10,56g. D 14,25

Đặt 6 câu với cấu trúc so sánh more,less,fewer giúp em với có thể xong trước 3:30 được không ạ 🥺

cos (2x+3)= 1phần 2 Mn giúp e giải pt vs ạ💙

tìm x thỏa mãn :x-2/3=4/5 làm nhanh hộ mk nhá mình vote cho 5 sao đó

Part 1: (10 points). Use the word in brackets; complete the second sentence so that it has a similar meaning to the first one. DO NOT change the word given. 1. A heavy fall of snow prevented them from getting home that night. (ABLE) They _________________________________home that night because of a heavy fall of snow. 2. I went to the dentist's because I couldn't stand the toothache any longer. (UP) I couldn't ___________________________the toothache any longer, so I went to the dentist's. 3. I would like to be able to speak French. (HAD) I wish __________________________________________________ speak French. 4. Nadia's friend arrived just as she was about to leave the restaurant. (POINT) Nadia was just________________________________the restaurant when her friend arrived. 5. I can't understand Doris and what she has done. (SENSE) I can't ____________________________________________ Doris and what she has done.

Powering the future Despite modern society’s heavy dependence on fossil fuels for energy, most people are aware that the supply of these fuels is finite. As oil, in particular, becomes more costly and difficult to find, researchers are looking at alternative energy sources, including solar, wind, and even nuclear power. Solar panels catch energy directly from the sun and convert it into electricity. One of the world’s largest solar power stations is located near Leipzig, Germany, where more than 33,000 solar panels have capacity to generate enough energy to power about 1,800 homes. But unlike the burning oil of fossil fuels, the process used to create all the solar energy produces no emission. Today, however, solar provides less than one percent of the world’s energy, primarily because the cost of the panels is still very high. And the price is only one issue. Clouds and darkness also cause solar panels to produce less energy, which requires one to have additional power sources (such as batteries) available. Some scientists think the solution to this problem can be found in space – which they say is the ideal place to gather energy from the sun. With no clouds and no nighttime, a space-based solar power station could operate constantly. These stations would send the power back to the Earth, which could then be turned into electricity for consumption. Wind – the fastest growing alternative energy source – is another way of collecting energy from the sun. Wind is caused by the sun’s heat rather than its light, and therefore, unlike solar power, it works well even on cloudy days. Despite its success, some oppose wind-power development, saying the turbines are both noisy and ugly. Just outside England’s Lake District, a protected national park, twenty-seven wind towers are planned. Many locals are protesting. “This is a high – quality landscape,” says one local homeowner. “They shouldn’t be putting those things in here.” There are other challenges, too. If the wind doesn’t blow, the turbines are not able to produce adequate energy. As a result, other power sources are needed. In contrast, a strong wind can create too much power. In case like this, the energy company must sell the extra power at a much-reduced rate, which is not good for business. What’s needed for both wind and solar is a way to store a large energy surplus. In the 1970s, nuclear was seen as the main energy alternative. Nuclear power produces vast amounts of electricity more cheaply than gas or coal, with no carbon emissions. For a number of years in the 1980s and 1990s, however, use of nuclear declined due to accidents, concerns about nuclear waste storage and disposal, and high construction costs. Today, times are changing. Worldwide, about 432 plants now generate 13 percent of the planet’s electric power, and some countries have invested heavily in nuclear energy. France, for instance, gets three quarter of its electricity from nuclear power, the highest of any countries. China has started to build one or two new plants a year, and India has also begun to utilize nuclear energy on a large scale. In the end, is any of these sources alone the answer to our current energy problems? The short answer is no, but used in some combination – along with other sources – we may find ways to reduce and eventually eliminate our dependence on fossil fuels. 1 What is the passage mainly about? A Possible replacements for fossil fuels for energy. B The various causes of the energy crisis in the world. C The benefits of solar power over other alternative energy sources. D Problems caused by our overdependence on fossil fuels. • The word “emission” in paragraph 2 is closest meaning to ________. • panels B. electricity C. pollution D. accidents • Which of these statements about solar energy is stated in the passage? • Solar energy is currently the biggest contributor to the world’s energy. • Solar energy is cheap to produce due to low price of solar panels. • Solar space stations could be the solution to the energy crisis. • Solar energy can have a harmful effect on the environment. • What is NOT mentioned as a disadvantage of wind power? • Strong winds produce too much power. • Strong winds can damage the turbines. • The turbines create of a lot of noise. • The turbines are seen as ugly. • Which of these statements is true about nuclear energy according to the passage? • It is more expensive form of energy than coal or gas. • It produces a lot of carbon waste. • Safety concerns made nuclear energy unpopular for several decades. • Nuclear energy is becoming less popular than other energy sources. • Which country gets most of its power from nuclear power? • France B. Germany C. India D. China

Enjoy the benefits of stress! Are you looking forward to another busy week? You should be according (1) _________some experts. They argue that the stress encountered in our daily (2) __________ is not only good for us but essential to survival! They say that the response to stress, which creates a chemical called adrenalin, helps the mind and body to act quickly (3) ___________ emergencies. Animals and human beings use it to meet the hostile conditions which exist on the planet. Whilst nobody denies the pressures of everyday life, what is surprising is that we are yet to develop successful ways of dealing (4) ________________ them. Even the experts consider the current strategies to (5) ______________inadequate and often dangerous. They believe that (6) __________ of trying to manage our response to (7) _____________ with drugs or relaxation techniques, we must exploit it. Apparenly, research shows that people (8) __________ create conditions of stress for themselves by doing exciting and risky sports or looking for challenges, cope much better with life's problems. Activities of this type (9) ____________been shown to create a lot of emotion; people may actually cry or feel extremely uncomfortable. But there is a point (10) ___________which they realise they have succeeded and know it was a positive experience. Your answers: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Smart shoes Smart shoes that adjust their size throughout the day could soon be available. A prototype of such a shoe has already been produced and a commercial (1) ___________may be in production within a few years. The shoe contains sensors that constantly (2) ___________ the amount of (3) ___________ left in it. If the foot has become too large, a tiny valve opens and the shoe (4) _________ slightly. The entire control system is about 5 mm square and is (5) _______ inside the shoe. This radical shoe (6)______ a need because the volume of the (7) __________ foot can change by as much as 8% during the course of the day. The system is able to learn about the wearer's feet and (8) __________ up a picture of the size of his or her feet throughout the day. It will allow the shoes to change in size by up to 8% so that they always fit (9) _________. They are obviously more comfortable and less likely to cause blisters. From an athlete's point (10) __________view, the shoes can help improve (11) _______ a little, and that is why the first (12) ________ for the system is likely to be in a sports shoe. Eventually, this system will find a (13) _________ in other household items, from beds that automatically change to fit the person sleeping in them to power tools that (14) _________ themselves to the user's hand for better grip. There is no reason why the system couldn't be (15) ________ for use in hundreds of consumer goods. 1. A. assortment B. version C. style D. variety 2. A. prove B. confirm C. inspect D. check 3. A. room B. gap C. area D. emptiness 4. A. emplifies B. develops C. expands D. increases 5. A. located B. sited C. established D. laid 6. A. detects B. finds C. meets D. faces 7. A. average B. general C. usual D. medium 8. A. build B. pick C. grow D. set 9. A. exactly B. absolutely C. completely D. totally 10. A. in B. by C. for D. of 11. A. achievement B. performance C. success D. winning 12. A. purpose B. exercise C. use D. operation 13. A. function B. part C. way D. place 14. A. shape B. change C. respond D. convert 15. A adapt B. adapting C. adapted D. to adapt Your answers: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Part 2: (12 points).Read the following text and choose the best phrase from the list A-I given below to fill in each of the spaces. Each correct phrase may be only used once. There are some extra phrases. Write your answers in ‘Your answers’ part. The problems of public speaking For most people, one of the biggest fears in life is having to make a speech, whether at school, at a wedding, or in our business lives. There are several good reasons for this, not least amongst them the fear that no-one will have the slightest interest in what you are saying. If you are on stage, as is often the case with speeches, there's no problem. (1) _____________ you to see the audience, because the lights blind you the moment you step up. The only area of the stage that may have no light whatsoever is the lectern where you put your notes - it will be in total darkness.(2) __________ you probably realise that you have left your glasses at home. (3) __________, you now have to improvise a 40-minute speech based on those few words of your notes you can actually see. It's then that the technical faults start to come into play. First, if you need any, your slides and illustrations won't work. (4) _____________, you'll accidentally push the wrong button and show everything upside down. (5) ________________ , they will show the wrong picture at the wrong time, and even jump a couple! If you're lucky, the lights will fail at this point and the speech will have to be abandoned. (6) ______________ the technical support is excellent, which allows you to make a good and lasting impression. It's important to start well. To fight nerves, it's a good idea to grip the lectern with both hands, but not too tightly, because they have been known to collapse! A. It's at about this time that B. If professionals are in charge C. It's always a good thing D. If it's in your hands E. Fortunately, it is not possible for F. There are times, however, when G. However, if it isn't the case H. Despite having spent ages preparing it I. With this in mind

Vì sao cách mạng Công nghiệp ở Pháp diễn ra muộn mà lại phát triển nhanh?

Part 2: (10 points). Read the text below and look carefully at each line. Some of the lines are correct, and some have a word which should not be there. If a line is correct, put a tick (√) by the number. If a line has a word which should not be there, write it in ‘Your answers’ part. CARIBBEAN PARADISE Line St Lucia has always been on one of my all-time favourite holiday destinations. I first discovered its dramatic scenery on my honeymoon before twelve years ago and have been back many times since. I generally stay in the north of the island at where there are many well- equipped villas situated in acres of private tropical grounds along stretches of a white sandy beaches. The food is excellent too, combining traditional local cooking with European sophistication. During the day there is plenty to do, including watersports such like as windsurfing and snorkelling and beach games like volleyball. Entertainment is also being provided at night with steel bands and limbo dancing. However, you can spend on many hours just sitting up outside looking at the spectacular sunsets and listening to the gentle lapping of the waves on the shore. This is real island paradise. 0…on….…. 00….√….… 1……….... 2……….... 3……….... 4……….... 5……….... 6……….... 7……….... 8………... 9……….... 10………....