Question

what are the characteristics of chemical reactions​

Answer 1

The characteristics of a chemical reaction are :

Evolution of gas.

Formation of a precipitate.

Change in color.

Change in temperature.

Change in state.

Formation of new substances.

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Answer 2

Answer:-

The characteristics of chemical reactions are :

1) Change of colour - When citric acid is added to Potassium permangenate then the purple colour starts discharging .

2)Change of state - When hydrogen(gas) reacts with oxygen(gas) , they form water a liquid

3)Evolution of a gas - When lead nitrate is heated the it decomposes to lead oxide , nitrogen dioxide with oxygen .

4) Formation of a precipitate - When lead nitrate reacts with potassium iodide , it forms a yellow precipitate Lead iodide and potassium nitrate .

5)Change in temperature -

- Exothermic reaction - reaction in which heat is released

When quick lime reacts with water to form slaked lime , it releases a lot of energy .

- Endothermic reaction - reaction in which heat is absorbed

When hydrogen reacts with iodine to form hydrogen iodide , it absorbs a lot of energy....✌️❣️