It's a chemical change because it's changing the object's property.
Answer: The bulk of liquids separate from the standard substance through crystallization, creating a crystalline block.
Freezing is almost often an exothermic mechanism which ensures that heat is emitted when liquid transforms into concrete.
The energy emitted after freezing, known as the fusion enthalpy, is a latent heat, which is precisely the same as the energy used to melt the same volume of solid.
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Given that
Mass of water = 65.34 g
Amount of heat = mass of water * specific heat (temperature change
)
= 65.34 g * 4.184 J / g-C ( 21.75-18.43 )C
= 907.63 J
= 0.908 KJ
And
1 cal = 4.186798 J
907.63 J * 1 cal / 4.186798 J =216.78 cal
Or0.218 kcal
