Question

characteristics of chemical reactions

Answer 1

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

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Answer 2

*Evolution of gas
*formation of a precipitate
*Change in temperature
*Change in state
*Change in colour

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