Classify the following as a physical or chemical change Change
Dry ice sublimates.
Mercury oxide decomposes into mercury and oxygen
Nail polish remover evaporates
Intermolecular forces are overcome between iodine molecules
Milk is heated to 40°C
Butter softens when heated
Sugar is ground to form icing sugar
Sugar caramelises during the making of fudge
Ice melts
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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.

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