What new inforamtion can you add the your definition of physical change?

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A physical change is one in which a substance may change its form but still retain it's original chemical composition. An example of a physical change is a phase change where a substance changes from one phase (solid, liquid, gas) to another.
Using water as an example: As water changes from water vapor to liquid and freezes to ice, the chemical formula remains the same; H2O.

Answer : option c) heat is released during the process.explanation :

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.

Carbon based or cells?