Cho các cặp chất sau: H2SO4 và KHCO3; K2CO3 và Na2CO3; MgCO3 và HCl; MgCO3 và NaCl. Những cặp chất nào có thể tác dụng được với nhau? Viết PTHH.

Ex1. Complete the sentences with and, but, so, or, because 1. Olivia was very happy.............she passed her examination 2. He didn't study...............he failed the history exam 3. My mother usually gets home at 5o'clock...........then she cooks dinner 4. I was late for class tills morning.............the bus was late 5. We went to Jane's house............she was out 6. We can go to the pool............we can go hores-riding, whichever you perfect 7. She is studying very hard...........she wants to be a doctor 8. Carol studied hard for the maths test...........she couldn't get good mark 9. The floor was wet and slippery..............Mason almost fell 10. Mike ate healthy food...............did regular execises to keep fit Ex2. Fill each blank with a suitable prepossition 1. Tom Holden worked.............a volunteer at a charity in 2010 2. They provied housing and othe supports..................homeless people 3. Some volunteer enjoy helping elderly people living...............nursing homes 4. She donated thousands of pounds.....................children's charities 5. The benefits...............volunteering are enormous to you, and your community 6. You can volunteer to help cook and serve a meal............a homeless shelter 7. UNICEF has launched a campaign to help children..............need 8.They provided street children............food and books

Tổng số hạt proton ,số notron ,số electron trong nguyên tử là 28 . trong đó số hạt ko mang điện sấp sỉ 37,715 % .tính số hạt mỗi loại

Change the notes into cooking steps to show a foreign visitors how to make yellow sticky rice Đừng sao chép ở đâu, tự làm nha!!!!!

1.Fred loves _____ websites about famous people A. looking at B. look at C. looked at D. looking 2. Every friday, jack goes________with his mother. He likes__ nreakfast at home A. shopping/having B. to shop/have C. shopping/have D. shop/having 3. I ______ colectting paper dolls when i was 6 years old A. takes B. took C. take up D. took up 4. My siser preers____ to __________ A. cook/knit B. to cook/knitting C. cooking/knitting 5. Getting_____ rest is really important to your health A. a lot B. plenty C. plenty of. D. lots 6. The_______ are people who don't have their own house to live in A. young children B. street children C. rich children D. weak children

tìm số tự nhiên x biết : x : 24 , x : 16 và 45 < x < 90

viết đoạn văn ngắn nêu cảm nghĩ của em về Em bé thông minh

viết mở bài về loài cây em yêu(cây bàng trong sân trường) không copy cảm ơn mn ạ

Bản đồ là gì, công thức tính tỉ lệ bản đồ

Chức năng của hồng cầu ,đặc điểm nào giúp hồng cầu thực hiện chức năng đó?