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Theo đề bài ta có
Số mol của NaOH hòa tan trong 250 ml dd NaOH 0,5M là
nNaOH=CM.V=0,5.0,25=0,125 mol
⇒⇒ Thể tích dung dịch NaOH 2M trong đó có chứa 0,125 mol NaOH là
\(v=\frac{n}{CM}=\frac{0,125}{2}=0,0625l=6,25ml\)
very day you hear or read many new English words. You also find them in your dictionary when you are translating from your own language. You can’t possibly learn all these new words, so your first problem is to decide which ones to concentrate on. Here are some suggestions:
How to learn words
Once you have chosen which words to learn, you next have to decide how you are going to learn them. Here are a few ideas:
Some students put a k or cross in their dictionary next to every word they look up. The next time they turn to a page with a marked word, they quickly check to see if they remember the meaning of that word.
In all of the above ways, you are doing something with the words. It’s usually not enough to just read through a list of words with their definitions or translations and try to remember them. Most students find that they memorise words better if they do something with them. Even better is to try and learn the word in a typical combination with other words. Learning that to apologize means to say sorry is a good start, but it's much better to learn a whole expression containing the word, e.g. He apologized for being late. Not only is this often easier to remember, but you are also learning some very important information on how the word is used.
Learning for vocabulary tests
The previous section on this page gives general advice on how to learn the words that you have chosen as important for you. Often, however, you will be given a set of words by your teacher and told to learn them for a vocabulary test. In this case you need to be sure exactly how you will be tested, because this will influence how you learn the words. There are several ways that the teacher might test your vocabulary learning, but the ways are broadly divided into two categories:
If you do a vocabulary test from the second group above, then in most cases you will need to learn the exact spelling of the word and will lose marks if you misspell it. As with all tests, be sure to ask the teacher exactly how you will be tested and exactly how you will be graded. You will then avoid wasting time studying something that you will be not be tested on.
Learning vocabulary by reading
The way you learned very many of the words in your own language was by meeting them in the books and magazines you read. The context of a new word in a sentence or story was often enough for you to guess the meaning. Meeting the word again and again in your reading helped you learn it for use in your own speaking and writing. Doing lots of extra reading for pleasure - both fiction and non-fiction - is an excellent way to learn new English words, too. But choose books that you find quite easy to read. Difficult stories or texts that you struggle to understand will not help you to develop your vocabulary the natural way. But remember: to learn new words from reading you have to read A LOT!
More on the importance of reading.
More information about learning words
The vocabulary you know can be divided into two groups - passive vocabulary and active vocabulary. Passive vocabulary contains all the words that you understand when you read or listen, but which you do not use (or cannot remember) in your own writing and speaking. Active vocabulary is all the words you understand, plus all the words that you can use yourself. Your active vocabulary, in English and your own language, is probably much smaller than your passive vocabulary.
The more you work on learning a word, as suggested above, the more ly it is that it will become part of your active vocabulary.
Things to know about the words you learn
Usually the first things you learn about a new English word are what it means and its translation in your own language. But there are other things you need to find out before you can say that you know a word a native speaker does. For example, you have to learn:
Native speakers learn these things about words by hearing them and reading them again and again. This is the best way for you to learn them, too.
Go to this site's vocabulary files
Read a Japanese translation of this page.
"Most students find that they memorise words better if they do something with them. Even better is to try and learn the word in a typical combination with other words."
The internet is really important for learning English
tk cho mk nha
Nowadays, it is an important question whether we should let our young children play computer games or the games should be banned. While some people think it is fine for their children to play, others believe it is unacceptable. As far as I am concerned, the disadvantages of video games outweigh the advantages.
First of all, the possible benefits of computer games should be mentioned. There are a wide range of games created for educational purposes, especially for the very young children. This allows kids to learn how to use modern computers as well as some new information from the educational game. Additionally, for youngsters, games can keep them from bad companies. They can simply sit home communicating with their friends and having fun instead.
However, the number of drawbacks also takes place. Modern games are expensive and usually involve further purchases while the game is being played. Another aspect is the amount of time children spend on computer games. Instead of education and learning, kids waste hours online even without breaks, thereby influencing the condition of their health. The most considerable disadvantage in video games is cruelty. Although there are age limits, parents still buy such games for their infants. As we know, there have been a few cases when children took guns and shoot innocent people on the street. The computer games have the negative effects on health and psychology as well. Young students who are addicted to games often perform poorly on academic studies.
To sum up, although there are fun and educational games, the most of modern video games are violent and cruel, and this may have dreadful consequences. Therefore, I believe there are more drawbacks than benefits.
Viết lại câu sao cho nghĩa không thay đổi
1_Mary hasn't returned my book yet
=> My book hasn't been returned by Mary yet
2_ Her house is bigger than mine
=> My house is smaller than her one
3_ To find a job at my age is diffcult
=> It's diffcult to find a job at my age
4_It's important for me to learn English.
=> I find important to learn English.
5_We will do all homework before going to class
=> All homework will be done by us before going to class
6_"Please be quiet" the teacher said
=> The teacher told me to be quiet
7_ Playing sports is very necessary for teenagers
=> It's very necessary for teenagers to Play sports
8_ My mother often cooks the meals
=> The meals are often cooked by my mother
Bn len GOOGLE DICH maf SUFT nha !!
you and I are two mysterious people who together overcome nardship,difficulties have never stepped back.I will always love you only,even if the next life wishes we will remain
dịch:
Bạn và tôi là hai người bí ẩn cùng nhau vượt qua khó khăn, khó khăn chưa bao giờ lùi bước. Tôi sẽ luôn chỉ yêu bạn, ngay cả khi kiếp sau chúng ta sẽ vẫn còn