viết các PTHH điều chế H2 trong PTN khi cho các kim loại Al, Mg,Mg,Fe,Zn lần lượt tác dụng với ãit Sunfuric H2SO4 với ãit clohidric HCL? a) nếu cùng 1 khối lượng kim loại bằng nhau thì trừơng hợp nào cho lượng khí hidro là nhiều nhất ? b) để điều chế lượng khí hidro bằng nhau thì lượng kim loại nào được dùng nhiều nhất?

Các câu hỏi liên quan

VI. WRITING Exercise 1. Make questions for the underlined parts in the following sentences. There is an example in the beginning. 1. She was born in 2005. When was she born? 2. I’m watching a TV show at the moment. _____________________________________________________________? 3. The children are playing in the park. _____________________________________________________________? 4. They get to school by bus every day. _____________________________________________________________? 5. We play sport because it’s good for our health. _____________________________________________________________? 6. Mr Smith teaches us English at school. _____________________________________________________________? 7. This is Tom’s bike. _____________________________________________________________? 8. There are forty students in my class. _____________________________________________________________? Exercise 2. Join these pairs of sentences in different ways, using a suitable conjunction: and, but, so, because or although. There is an example at the beginning. 1. It is raining heavily. They can’t go for a walk. => They can’t go for a walk because it is raining heavily. => It is raining heavily, so they can’t go for a walk. 2. Tom can play the guitar. He can also play the piano. => ____________________________________________________________. => ____________________________________________________________. 3. I love ice cream. I don’t eat it often. => ____________________________________________________________. => ____________________________________________________________. 4. Hoa lived in Great Britain for many years. She speaks English very well. => ____________________________________________________________. => ____________________________________________________________. 5. It rained a lot. We enjoyed the holiday. => ____________________________________________________________. => ____________________________________________________________. ai làm dc mik tích cho 5 sao cộng 1 cảm ơn