sục V lít khí CO2 (đktc) vào 2 lít dung dịch Ca(OH)2 0,05M , thu được 7,5 gam kết tủa . các phản ứng xảy ra hoàn toàn .tính giá trị của V ?

GIẢI THÍCH CHI TIẾT TỪNG CÂU ĐẤY NHÉ ...................

Tìm x thuộc Z biết |x+2015|+2016<0

Giải giúp mình với ạ.Mình cám ơn nhiều nhé

2 kho hang chua tat ca 2416 tan gao .Neu chuyen 1/5 so gao kho thu nhat sang kho thu hai thi so gao chua trong 2 kho se bang nhau. Hoi moi kho chua bao nhieu tan gao

Anh/chị hãy cảm nhận về 1 cuốn sách đắc nhân tâm mình đã đọc. Trong đó phải chủ đề, tác giả, NXB của cuốn sách ấy ( viết không vượt quá 1 trang)

Trả lời giúp em (em cho 5 sao ạ, em cảm ơn nhìu )

Vẽ anime tùy thích anime girl càng tốt nhé tại đang bí ý tưởng vẽ nên xin mọi người mấy bức tranh !

Cho hình thang vuông ABCD có góc A = góc D =90 độ:AB = 2cm:BD = 4cm:CD = 8cm a) Chứng minh tam giác ABD đồng dạng với tam giác BDC b) Tính BC

Name: Class: TEST 15’ (unit 7) I. Choose the best answer to complete each of the following sentence: 1. They suggest that we ……………….. throw trash in public places. A. don’t have to B. shouldn’t C. not to D. won’t 2. John didn’t come to the meeting yesterday, ………………. We went without him. A. consequently B. so C. therefore D. All are correct 3. Using public transports is an effective way to ……………. traffic jam and pollution. A. reduce B. increase C. continue D. gain 4. A clean, safe from of energy which comes from the sun is ……………. A. solar energy B. fossil energy C. lunar energy D. wind energy 5. A: I suggest fixing the dripping faucets. – B: ………………………….. A. Good idea B. Yes, please C. I’m afraid not D. We will 6. Television, dishwashers and refrigerators are electrical …………………… A. appliances B. things C. households D. tools 7. The energy-saving bulbs use a quarter of the electricity of standard bulbs and ……………….. eight times longer. A. use B. save C. last D. waste 8. Solar ……………… are placed on the roof of a house to get energy. A. boards B. bars C. panels D. sheets 9. We’re very …………….. about spending a lot of money on energy in our homes. A. disappointed B. worried C. pleased D. hopeless 10. He is interested in …………………… natural resources but he doesn’t know how to do. A. conserve B. conserving C. conservation D. conservationist 11. Don’t waste water or you’ll get an enormous …………….. by the end of the month. A. letter B. receipt C. bill D. paper 12. Solar energy doesn’t ………………. Pollution or waste natural resources. A. cause B. make C. stop D. reduce 13. Lighting ……………. For 20 percent of our electricity bill. A. accounts B. wastes C. makes D. uses 14. He has a good vocabulary. ………………………, he pronounces well. A. Therefore B. Besides C. However D. So 15. He is sick, …………….. he can’t come. A. therefore B. because C. however D. so II. Rewrite the following sentences without changing their meanings. 1. Why don’t we collect plastic bags?  I suggest …………………………………………………………………………………………………… 2. “Let’s keep sheets with single printed page for drafting.”  He suggested that ……………………………………………………………………………………. 3. She was very tired, so she went to bed.  She went …………………………………………………………………………………………………. 4. If we use solar energy, we can save natural resources.  By ……………………………………………………………………………………………………………. 5. To use solar energy for a number of days is possible.  It is …………………………………………………………………………………………………………..