Khử hoàn toàn23,2g môt oxit kim loại bằng CO ở nhiệt độ cao thành kim loại. Dẫn toàn bộ khí sinh ra vào bình đựng 250 ml dd BA(OH)2 1M thấy tạo ra 19.7 g kết tủa. Nếu cho lượng kim loại sinh ra hòa tan hết vào dung dịch HCL dư thì thu được 6,72 lít khí (ở đktc) Xác định oxit kim lolo đó

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?