State the characteristics of a chemical reaction with one example of each.
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Please find below the solution for your asked query:
The characteristics of the chemical the reaction are as follows:
H2 (g) + O 2 (g) → H 2 O (l)
As shown above, reactants are gases but the product is liquid.
2. Change in color - In some cases, the color of starting solution is changed after the end of the chemical change reaction.
CuSO 4 (Blue) + Fe → FeSO 4 (green) + CuS
The color of the solution change from blue to green.
3. Evolution of gas - Some chemical change show the evolution of gas
Cu +H 2 SO 4 → CuSO4+H2↑
Hydrogen is released as gas in the above-mentioned reaction.
4. Change in energy - Energy is either absorbed or released during chemical a chemical change. When energy is released in a chemical reaction it is called exothermic. When energy is absorbed in the reaction it is called an endothermic reaction.
(i)C+O 2 →CO2+ energy...........exothermic reaction
(ii) CaCO 3 + energy → CaO+CO 2 ...........endothermic reaction.
5. Formation of a precipitate - In some chemical change there is the formation of an insoluble precipitate.
BaCl2 (aq.) + Na 2 SO 4 (aq.) → BaSO 4 ↓ +2NaCl(aq.)
BaSO4 comes out as precipitate from the reaction.
Hope this helps!
Regards
Please find below the solution for your asked query:
The characteristics of the chemical the reaction are as follows:
1. Change in state- Some of the chemical change is followed by the change of state of starting material.
As shown above, reactants are gases but the product is liquid.
2. Change in color - In some cases, the color of starting solution is changed after the end of the chemical change reaction.
CuSO 4 (Blue) + Fe → FeSO 4 (green) + CuS
The color of the solution change from blue to green.
3. Evolution of gas - Some chemical change show the evolution of gas
Cu +H 2 SO 4 → CuSO4+H2↑
Hydrogen is released as gas in the above-mentioned reaction.
4. Change in energy - Energy is either absorbed or released during chemical a chemical change. When energy is released in a chemical reaction it is called exothermic. When energy is absorbed in the reaction it is called an endothermic reaction.
(i)C+O 2 →CO2+ energy...........exothermic reaction
(ii) CaCO 3 + energy → CaO+CO 2 ...........endothermic reaction.
5. Formation of a precipitate - In some chemical change there is the formation of an insoluble precipitate.
BaCl2 (aq.) + Na 2 SO 4 (aq.) → BaSO 4 ↓ +2NaCl(aq.)
BaSO4 comes out as precipitate from the reaction.
Hope this helps!
Regards
