Answer:
Heterogeneous
Explanation:
The catalyst, Pt, is not in the same phase as the reactants, i.e. it is solid, whilst the hydrogen peroxide is aqueous.
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Answer:

Explanation:
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In this case, since these calorimetry problems are characterized by the fact that the calorimeter absorbs the heat released by the combustion of the substance, we can write:

Thus, given the temperature change and the total heat capacity, we obtain the following total heat of reaction:

Now, by dividing by the moles in 1.04 g of cyclopropane (42.09 g/mol) we obtain the enthalpy of combustion of this fuel:

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Answer:
Elements in which the d-sublevel is being filled have the properties of metals