Ice melting as endothermic process
Delta H reaction (ΔH) is the amount of heat change between the system and its environment
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
The value of ° H ° can be calculated from the change in enthalpy of standard formation:
In the matter of a substance, there is a process of change.
2 changes occur in the mater, namely: physical changes and chemical changes
Classification uses the principle of the initial and final state of the substance.
Physical changes are changes in the matter which in the process do not cause new substances. So the properties of the particles remain the same.
Generally, the physical changes that occur are changes in shape and size, changes due to heating, or changes in volume
Chemical changes are changes in the process of producing new substances that are different from the initial / forming substances. Chemical changes are usually known as chemical reactions. So there are products / reactions and reactants
ice melting is one of the physical changes, because the nature of water is the same both in solid form as ice and after melting and also does not form new substances. This event will require heat energy because the change in form from water to ice and vice versa occurs at the point 0 C. The temperature of the ice below 0 will begin to melt above O by absorbing heat, which is an endothermic process
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