Đun nóng 20 g một chất béo với dung dịch chứa 10 g NaOH. Sau khi phản ứng xà phòng hoá xảy ra hoàn toàn, phải dùng hết 100 g dung dịch HCl 6,57% để trung hòa lượng NaOH dư a) Tính khối lượng NaOH cần dùng để tham gia phản ứng xà phòng hoá 1 tấn chất béo nói trên. b) Tính khối lượng glixerol và khối lượng xà phòng chứa 72% muối natri của axit béo từ 1 tấn chất béo nói trên.

Talk about your dream school ( have main idea and supporting idea )

Hòa tan 16g oxit của kim loại R hóa trị IV cần dùng 109,5g dung dịch HCl 20%. Xác định R Mn giúp em với ạ =))

___________ are very demanding. They want products that are both cheap and of good quality.(consume) * consumers consumer consuming consumption His wife said, “ Let’s have dinner after the theater.” His wife suggested that __________________. * we should have dinner after the theater. having dinner after the theater. they have dinner after the theater he should have dinner after the theater. To keep the air unpolluted, people ought to use ____________ energy to create electricity. ( sun ) * sunny solar sunshine sunlight I suggest putting garbage at one place behind the house. * Sorry. I’m too busy today How luxurious I don’t need your idea any more. Let’s do that. What time should Eric start to work ? “ I suggest __________________here about 7.30” * that he should be that he will be him to be him being Why don’t you ask her yourself ? __________ * I suggest asking her. I suggest you should ask her. Why don't we ask her? Let's ask her. Let’s not tell anyone until we are certain that the report is true,” said Tom. Tom suggested that _____________. not tell anyone until we are certain that the report is true not to tell anyone until we are certain that the report is true we should not tell anyone until we are certain that the report is true he should not tell anyone until we are certain that the report is true A______________ is a person who installs and repairs things such as water pipes , toilets, etc.(plumbing) * plumber plumbers plumps plumb If you want to save money, you should ________________the amount of water your family uses. * increase reduce adapt repair Lighting accounts ____________________10 percent to 15 percent of the electric bill. * for on to about – Mom, I’ve passed the exam! ______________________my son. * Good job! Try harder! I love you so much. What gift do you want? Electricity and water are considered the _______________ of modern life. * necessities needs necessity necessary Remember to turn ___________the light before leaving. * on of off down - Shall we go to school by bus tomorrow? ______________ * a. That’s a good idea. b. Why? How come? c. I don’t mind. d. Using public buses can avoid traffic jams. Water is going all over the floor because of the ______________ faucet. ( drip ) * driping drip dripping to drip ______________ take the train instead of the bus ? It’s faster. * Why not How about Let’s why don't – Mom, I failed the exam! ______________________, my son. * Good job! Try harder! I love you so much. What gift do you want? Mary’s eyes are weak . _______________________, she has to wear glasses. * but and however therefore Why don’t you repair the electric fan, Ba?” She suggested _____________ * we should repair the electric fan. that he shouldn't repair the electric fan. that he should repair the electric fan. repairing the electric fan. He had an accident since he was careless. Because of ............ * his careless, he had an accident. he was careless,he had an accident. being careless, he had an accident. he had an accident,he was careless.

Cần giúp câu 20,21 , giải chi tiết mình cần gấp

Tìm tập hợp số nguyên x biết -25 phần 5 lớn hơn x và bé hơn -6 phần 3

Câu 1. Mục đích chủ yếu của việc xây dựng các khu công nghiệp tập trung ở các nước đang phát triển là. Một lựa chọn. A. sản xuất phục vụ xuất khẩu. B. thu hút vốn đầu tư nước ngoài. C. đẩy mạnh chuyên môn hóa sản xuất. D. tạo sự hợp tác sản xuất giữa các xí nghiệp.

câu 1 : cho các tổ hợp từ sau :giọt sương ,mây trắng ,nằm im ,tan biến ,tuyệt vời,hót hay ,khát vọng.Tổ hợp nào là từ ghép?Tổ hợp từ nào là từ đơn?

'the most recognisable' là gì ạ?

cho các số 0,1,2,3,4,5 .lập được bao nhiêu chữ số có bốn chữ số khác nhau .tròng đó phải luôn có mặt số 0 và số 1