user-avatar
loga6969
2 năm trước
Trên bàn thí nghiệm có những chất rắn màu trắng là: `Na_2SO_3, K_2CO_3, CaCO_3, NaHCO_3, Na_2CO_3, CaSO_4.` Bạn em đã lấy một trong những chất trên bàn để làm thí nghiệm và có kết quả như sau: Thí nghiệm 1: Cho tác dụng với dung dịch HCl, thấy giải phóng khí cacbon đioxit. Thí nghiệm 2: Khi nung nóng cũng thấy giải phóng khí cacbon đioxit. Thí nghiệm 3: Chất rắn còn lại sau khi nung ở thí nghiệm 2 tác dụng với dung dịch HCl cũng thấy giải phóng khí cacbon đioxit. Thí nghiệm 4: Cho tác dụng với dung dịch `H_2SO_4`, thấy giải phóng khí sunfurơ. Thí nghiệm 5: Cho tác dụng với dung dịch `Ba(NO_3)_2`, thấy tạo kết tủa trắng. Em hãy cho biết bạn em đã lấy chất nào trên bài thí nghiệm. Viết các PTHH.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

VII. Word form 1. (know). It is said Jim has a good ___________of Vietnamese. 2. (tradition). They went to a _________ craft village last week. 3. (paint). I adore folk ____________. 4. (vary). Non Nuoc marble village in Da Nang has a wide __________of sculptures. VIII. Word form 1. (attract). Our craft village is one of the famous __________where tourists can make handicrafts by themselves. 2. (enjoy) She said the trip to that place was ________. 3. (impress). I was very __________by the way they made things. 4. (history). There are many __________places in this city. IX. Ask questions 1. He has mentioned his family. 2. Tim is doing a mini presentation next week. 3. Tim is doing a mini presentation next week. 4. We will get used to their customs. 5. Everyone has to be there before 11 a.m. 6. He will play the piano to entertain the guests. X. Transformation 1. They locked the gate in order for him not to go out. - They prevented _________________________. 2. They will destroy those sick animals. - Those _____________________________. 3. She is too weak to do hard work - She is so_____________________________. - Because ____________________________ 4. Success results from hard work . - Hard work __________________________________ XI. Word form 1. (conserve). Those ________________ have worked positively to save that endangered animals. 2. (environment). I wish there were more ____________ who can help to protect the environment. 3. (forest). We know what to do to prevent _____________ . 4. (inform). Though the book is short, it is very _____________. XII. Verb form 1. Get on well with others and you (feel) happy. 2. Jack as well as his classmates (adore) (play) tennis. 3. Neither my siblings nor I (be) excited about the coming picnic. 4. Oh, dear! I (leave) my bag on the bus. 5. I have become used to (get) up early. 6. You have lost your keys again. Why you always (lose) your key? How annoying! 7. The phone (ring) while I (sleep). 8. She will come as long as he (invite) her.

VII. Word form 1. (know). It is said Jim has a good ___________of Vietnamese. 2. (tradition). They went to a _________ craft village last week. 3. (paint). I adore folk ____________. 4. (vary). Non Nuoc marble village in Da Nang has a wide __________of sculptures. VIII. Word form 1. (attract). Our craft village is one of the famous __________where tourists can make handicrafts by themselves. 2. (enjoy) She said the trip to that place was ________. 3. (impress). I was very __________by the way they made things. 4. (history). There are many __________places in this city. IX. Ask questions 1. He has mentioned his family. 2. Tim is doing a mini presentation next week. 3. Tim is doing a mini presentation next week. 4. We will get used to their customs. 5. Everyone has to be there before 11 a.m. 6. He will play the piano to entertain the guests. X. Transformation 1. They locked the gate in order for him not to go out. - They prevented _________________________. 2. They will destroy those sick animals. - Those _____________________________. 3. She is too weak to do hard work - She is so_____________________________. - Because ____________________________ 4. Success results from hard work . - Hard work __________________________________ XI. Word form 1. (conserve). Those ________________ have worked positively to save that endangered animals. 2. (environment). I wish there were more ____________ who can help to protect the environment. 3. (forest). We know what to do to prevent _____________ . 4. (inform). Though the book is short, it is very _____________. XII. Verb form 1. Get on well with others and you (feel) happy. 2. Jack as well as his classmates (adore) (play) tennis. 3. Neither my siblings nor I (be) excited about the coming picnic. 4. Oh, dear! I (leave) my bag on the bus. 5. I have become used to (get) up early. 6. You have lost your keys again. Why you always (lose) your key? How annoying! 7. The phone (ring) while I (sleep). 8. She will come as long as he (invite) her.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team