Bài 5: Viết các PTHHxảy ra khi cho: a) Oxit sắt từ + axit sunfuric loãng. b) FexOy + axit clohiđric; c) Magiê hidroxit + axit nitric; d) Canxi cacbonat + axit clohiđric; e) Kali hidroxit + axit sunfuhiđric; g) Bari nitrat + axit sunfuric; h) Bạc nitrat + axit clohiđric; i) Kim loại M + axit clohiđric. Bài 6: Hòa tan hết a gam kim loại Mg vừa hết 200 gam dd axit HCl thu được 4,48 lít khí H 2 ở đktc. a) Viết PTHH. Tính a. b) Tính nồng độ phần trăm của dd axit HCl đã dùng. c) Tính nồng độ phần trăm của dd muối thu được sau phản ứng

1/4+1/6+1/2 HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEE

Giải giùm em bài hoá này thanks

1.She ( not do) her last test well 2.I ( jeel) tired yesterday. 3. The baby (not drink) milk now. 4. My mum ( wash) her hair twice a week. 5.Ssh!They (discuss) about that problem. 6. where you (spend) your house holiday last summer ?

Làm và giải thích đúng giùm mik vs ạ

I. Transformation 1. The last time Jane talked to him was five days ago. - Jane _____________________________. 2. Jane isn’t here. - I wish _________________ 3. Jane wasn’t here yesterday. - I wish _______________________ 4. They have made great efforts to help the disabled. - Great _______________________________________ 5. Living in poverty prevents them from having proper schooling. - They live _________, _____________________ II. Verb form 1. The River Nile (be) the longest river in the world. 2. Jim is a volunteer and he (realize) that the disadvantaged (be) in need. 3. Mount Everest (conquer) in 1953. 4. What time you (do) at 8 tomorrow? 5. I never (see) such a nice bridge before I (move) to Da nang. 6. - Where the Amazon (rise)? – It (rise) in the Andes Mountains of Peru. III. How to tell the time. 5.15 - What time is it? / What’s the time? - It’s a quarter past five. / It’s a quarter after five. / It’s five fifteen a. 1.15: __________________________________________________________ b. 9.15: __________________________________________________________ c. 3.30: __________________________________________________________ d. 5.30: __________________________________________________________ e. 6.10: __________________________________________________________

tìm gtln, gtnn của biểu thức chứa căn

giúp me làm hét Nha. Nhanh lên nữa

III. Choose the correct answer. 11. The words jeans come from a kind of material that was made. Europe. A. of B. in C. by D. at 12. Mrs.Huong was tired, she helped her son with his homework. A. So B. Although C. Because 13. He went out last night with his friends, ? A. did he B. was he 14. It was too hot yesterday.. C. didn't he D. If D. wasn't he I turned on the air conditioner. A. because 15. If she rich, she would travel around the world. B. although B. is C. so C. has been A. would be 16. I've lost my key. I've_ it everywhere but I can't find it. A. looked B. looked after C. looked for 17. I wish I. a bigger house. A. have B. has C. have had 18. I want everybody to listen to Hoa's presentation. A. care B. careful C. careless D. if D. were D. looked at D. had D. carefully 19. The man A. who bike was stolen was very angry B. whose C. whom 20. "Thank you very much h^ prime prime .-^ prime prime \ A. Nothing overline C . B. You're welcome Not all D. which D. Are you worried?

BÀI 4 Tìm số tự nhiên cs 6 chữ số biết chữ số hàng đơn vị là 4 , biết rằng nếu ta chuyển số 4 lên đầu thì đc số mới gấp 4 lần số cũ