Lime(calcium oxide)is produced by heating limestone (calcium carbonate) in a hot kiln. Carbondioxide gas is given off as a waste product.is this chemical reaction endothermic or exothermic?
Answers
Answer:
It is an exothermic reaction.
Explanation:
When heated, limestone (known chemically as calcium carbonate) is converted into two new substances, lime (calcium oxide) and carbon dioxide, that have very different properties from those of limestone.
It is an exothermic reaction.
When heated, limestone (chemically known as calcium carbonate) is converted into two new substances, lime (calcium oxide) and carbon dioxide, which have very different properties than limestone.
Thus, in an exothermic reaction, energy is transferred to the surroundings rather than taking energy from the surroundings as in an endothermic reaction. In an exothermic reaction, the enthalpy change (ΔH) will be negative.
However, it is extremely difficult to measure or even calculate the absolute total energy in a given chemical system. Therefore, the energy change (or enthalpy change, denoted ΔH) is measured instead. The relationship between the value of ΔH and the binding energies of the reaction can be given by the following equation.
ΔH = (energy used in forming the bond that gives the products) – (energy released in breaking the bonds of the reactants)
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