ZnCl₂ (aq) + 2Na (s) - Zn (s) + 2NaCl(aq) CuCl,(aq) + Mg(s) → MgCl,(aq) + Cu(s) Ca(s) + ZnCl₂ (aq) → Zn (s) + CaCl₂(aq) reactants oxidized: reactants reduced: reactants oxidized: reactants reduced: reactants oxidized: reactants 0 reduced:
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.
![The image shows a series of chemical equations, each representing a redox reaction. There are boxes provided to identify which reactants are oxidized and which are reduced. Here are the detailed equations:
1. **Reaction 1:**
\[
\text{ZnCl}_2(aq) + 2\text{Na}(s) \rightarrow \text{Zn}(s) + 2\text{NaCl}(aq)
\]
- **Reactants oxidized:** [Box to fill]
- **Reactants reduced:** [Box to fill]
2. **Reaction 2:**
\[
\text{CuCl}_2(aq) + \text{Mg}(s) \rightarrow \text{MgCl}_2(aq) + \text{Cu}(s)
\]
- **Reactants oxidized:** [Box to fill]
- **Reactants reduced:** [Box to fill]
3. **Reaction 3:**
\[
\text{Ca}(s) + \text{ZnCl}_2(aq) \rightarrow \text{Zn}(s) + \text{CaCl}_2(aq)
\]
- **Reactants oxidized:** [Box to fill]
- **Reactants reduced:** [Box to fill]
On the right side of the image, there's a control box with three small icons representing different layout or display options, with an "X" button likely for closing and a circular arrow for refreshing or resetting the selection.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb516f95e-88c6-493f-82a8-a9d7f3dd16fa%2F1bc2cacb-0719-47e9-9929-53441e8d0dee%2Frng7ehu_processed.jpeg&w=3840&q=75)
When a reactant is oxidized, the oxidation number of elements in the reactant increases.
When a reactant is reduced, the oxidation number of elements in the reactant decreases.
So, first we have to find the oxidation number of each element participating in the reaction.
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