Question

List- 3 exemples of change where
heat is absorbed.​

Answer 1

Answer:

Label each of the following processes as endothermic or exothermic.

   water boiling.

   gasoline burning.

   ice forming on a pond

Explanation:

Answer 2

Answer:

1)Water absorbs heat as it becomes steam at 100C. This is called the enthalpy of vaporization (2256.4kJ/kg).

2)Ice absorbs heat as it melts to become water. This is called the enthalpy of fusion (333.55kJ/kg).

3)ron rusting: In the presence of both air and water (humid air) the rusting reaction is:

4Fe + 3H2O(l) + 3O2(g) = Fe2O3•H2O + FeO•OH + Fe(OH)3

Change in Enthalpy: ΔH(20C) = -1652.0kJ (negative, so the reaction is exothermic – the iron absorbs the heat produced)

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