Có hỗn hợp A gồm hai muối Na2CO3 và CaCO3 cho vào 1 lít dung dịch Ba(HCO3)2 khuấy đều thu được dung dịch B và 13,97 gam kết tủa. Dung dịch B tác dụng vừa đủ với 60 ml dung dịch HCl 1M và giải phóng 0,896 lít khí
(đktc). Tính nồng độ mol dung dịch Ba(HCO3)2 và phần trăm khối lượng CaCO3 trong hỗn hợp A.

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

For the following, determine the type of reaction and then give products.

Which statement are accurate about snow flakes