no reaction/no change
The reaction which forms potassium hydrogen carbonate from potassium carbonate, K2CO3 + H2O + CO2 --> KHCO3 is difficult to perform in a laboratory; the same goes for the decomposition. Hence instead of simply using a calorimeter or similar apparatus, it is necessary to use another reaction route and a Hess Cycle using two reactions such as: reaction A: K2CO3 + 2HCl --> 2KCL + H2O +CO2 reaction B: KHCO3 + 2HCl --> KCl + H2O +CO2 The enthalpy change of the decomposition of potassium hydrogen carbonate will be twice the enthalpy change for reaction B, minus the enthalpy change for reaction A.
There is no chemical reaction between potassium nitrate and water. Potassium nitrate dissolves in water, which is a physical change.
This reaction involves the decolourisation of the potassium permanganate - colour change from purple to colourless. This is unique alkenes on account of their double bonds.
it is because potassium hydroxide will react with carbon dioxide to form potassium carbonate and water. but potassium carbonate is soluble, so there will be no visible change to see if there is carbon dioxide emitted
The reaction between magnesium nitrate and potassium chromate is a chemical change. 2KOH(aq) + Mg(NO3)2(aq) --> 2KNO2(aq) + Mg(OH)2(s)
The reaction is:CaCO3==heating=====>CaO + CO2
Sodium and potassium reacting violently with water is a chemical reaction, causing a chemical change.
Once potassium bicarbonate reaches a temperature of about 100 to 120 degrees Celsius it undergoes a decomposition reaction: 2(KHCO3) = K2CO3 + H2O + CO2. This is a chemical change.