Select all that is true for thermochemical equations. A. If the coefficients in a balanced equation are multiplied by 2, the enthalpy change must also be multiplied by 2. B. If a reaction is endothermic and the equation for the reaction is reversed, the enthalpy change becomes positive. C. If there is 1 mole H2O(l) on the reactant side of the equation and there is 1 mole H2O(g) on the product side, they are canceled from the equation. D. There are two ways to express thermochemical equations--one with the heat on the reactant or product side of the equation and one with delta H equals the heat change.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Select all that is true for thermochemical equations.
| A. |
If the coefficients in a balanced equation are multiplied by 2, the enthalpy change must also be multiplied by 2. |
|
| B. |
If a reaction is endothermic and the equation for the reaction is reversed, the enthalpy change becomes positive. |
|
| C. |
If there is 1 mole H2O(l) on the reactant side of the equation and there is 1 mole H2O(g) on the product side, they are canceled from the equation. |
|
| D. |
There are two ways to express thermochemical equations--one with the heat on the reactant or product side of the equation and one with delta H equals the heat change. |
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