Example of chemical change?

Burning of paper and log of wood.

Digestion of food.

Boiling an egg.

Chemical battery usage.

Electroplating a metal.

Baking a cake.

Milk going sour.

Various metabolic reactions that take place in the cells.

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Explanation:

Burning of paper and log of wood

Digestion of food

Boiling an egg

Chemical battery usage

Electroplating a metal

Baking a cake

Milk going sour

Various metabolic reactions that take place in the cells

Rotting of fruits

Decomposition of waste

The explosion of fireworks

hope it helps..

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.