Tính % khối lượng từng nguyên tố trong hợp chất a) Fe 3 O 4 b) (NH 4 ) 2 SO 4

Nêu đặc điểm nhân dân chống Pháp xâm lược (1858-1884)

Một hỗn hợp khí A gồm 0,25 mol CO 2 , 5,6 lít H 2 ( đktc), 0,9.10 23 phân tử N 2 và 32 gam SO 2 . a) Tính thể tích hỗn hợp A ở đktc b) Tính khối lượng hỗn hợp khí A. PS đang giúp mn nhận điểm free ó xD

ai giúp nhanh với nhé ai làm nhanh được cho 5 sao I/ Choose the best answer (A, B, C or D) that is the same meaning with the italic sentence. ( 1điểm) 1. Alexander Graham Bell invented the telephone in 1876. A. The telephone is invented by Alexander Graham Bell in 1876. B. The telephone was invented by Alexander Graham Bell in 1876. C. The telephone in 1876 were invented by Alexander Graham Bell. D. The telephone will be invented by Alexander Graham Bell in 1876. 2. We are interested in protecting environment. Our teacher is pleased. A. Our teacher is pleased that we are interested in protecting environment. B. We are interested in protecting environment that our teacher is pleased. C. Our teacher is pleased to protect environment. D. Our teacher is pleased to be interested in protecting environment. 3. My father bought this house 2 years ago. A. This house was bought by my father 2 years ago. B. This house bought by my father 2 years ago. C. This house were bought 2 years ago. D. This house 2 years ago is bought by my father. 4. The car is very beautiful. It is made in Japan. A. The car is very beautiful made in Japan. B. The car made in Japan is very beautiful. C. The car making in Japan is very beautiful. D. The car is made beautiful in Japan.

So sánh khu thị thăng long thời trần với khu thị thời lý và nêu nhận xét

Hãy tính: a) Số mol CH 4 trong 0,3.10 23 phân tử CH 4 b) Số gam CO 2 trong 22 gam CO 2 c) Thể tích ở đktc của 64 gam khí O 2

làm giúp mình bài ba nhé ai đúng cho năm sao

Giúp mik nha ai làm đúng mik vote 5 sao I/ Read the following passage then choose the best option: (2điểm) COMPOST Compost is a wonderful natural resource that helps plants grow well. Today I am going to tell you (1)______ to start a compost heap. (2)______ we must use only household and garden matter including tea leaves and egg shells, but we must (3)______ them first. (4)______ use any meat or grain products because this attracts rats. Find a place (5)______ your garden that gets a few hours of sunlight each day. The (6)______ also needs moisture but it will get this from condensation. Cover the heap with a sheet of strong- plastic if the weather is (7)______. Keep adding to pile and after six months your compost can be (8)______ for your fields, gardens. 1.A. hot B. what C. where D. why 2.A. First B. Sencond C. Third D. Fourth 3.A. washing B. washed C. wash D. to wash 4.A. Don’t B. Do C. Not D. Did 5.A. on B. at C. for D. in 6.A. compost B. glass C. bottles D. can 7.A. wet B. warm C. cold D. hot 8.A. use B. used C. using D. to use

Giúp mik nha ai làm đúng mik vote 5 sao II/ Choose the word or phrase (A, B, C or D) which best completes each following sentence. (2điểm) 1. She _______me she didn’t know what to do. A. talked B. told C. said D. spoke 2. Would you mind if I _______a photo? A. takes B. take C. took D. taken 3. The _______festival was held in the communal house yard. A. rice- cook B. rice- cooking C. rice- cooker D. rice-cooked 4. He has worked with the computer _______this early morning. A. for B. from C. since D. until 5. It is dangerous _______in this river. A. swim B. swam C. swimming D. to swim 6. During his life, Thomas Edison made a lot of _______. A. inventions B. discoveries C. findings D. phone calls 7. Please tell me _______to get to the bus station. A. why B. which C. what D. how 8. Mary _______in a small house in the countryside. A. lives B. live C. living D. lived

Hãy viết chương trình: Nhập vào 1 xâu kí tự và kiểm tra số lần 1 kí tự t bất kì xuất hiện trong xâu vừa nhập Nhập xâu: Covid Kí tự kiểm tra: o Kết quả: 1 (Tức là có 1 kí tự o)