In the following reactions, decide which reactant is...

In the following reactions, decide which reactant is oxidized and which is reduced. Designate the oxidizing agent and the reducing agent. (a) $\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\ell)$ (b) $\mathrm{Si}(\mathrm{s})+2 \mathrm{Cl}_{2}(\mathrm{g}) \rightarrow \mathrm{SiCl}_{4}(\ell)$

In the following reactions, decide which reactant is oxidized and which is reduced. Designate the oxidizing agent and the reducing agent.
(a) $\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\ell)$
(b) $\mathrm{Si}(\mathrm{s})+2 \mathrm{Cl}_{2}(\mathrm{g}) \rightarrow \mathrm{SiCl}_{4}(\ell)$

Key Concepts

Reducing Agent

A reducing agent is a substance that donates electrons to another species, thereby causing that species to be reduced while itself becoming oxidized. Identifying the reducing agent in a reaction helps in understanding the electron transfer dynamics and the energetics involved in the redox process.

Oxidizing Agent

An oxidizing agent is a substance that causes another species to oxidize by accepting electrons from it. In the process, the oxidizing agent itself is reduced. This concept is critical for predicting the direction of electron flow in a reaction and for understanding the roles played by the reactants.

Redox Reactions

Redox reactions are chemical reactions that involve the transfer of electrons between species, resulting in changes in oxidation states. The species that loses electrons is oxidized, while the species that gains electrons is reduced. Understanding redox reactions is crucial for balancing chemical equations and gaining insight into reaction mechanisms.

Oxidation

Oxidation is the process in which a species loses electrons, which typically leads to an increase in its oxidation state. It can occur by several pathways such as the loss of electrons, gain of oxygen, or loss of hydrogen, and is fundamental to many chemical reactions in both industrial and biological systems.

Reduction

Reduction is the process in which a species gains electrons, resulting in a decrease in its oxidation state. This process can also be identified by the gain of hydrogen or the loss of oxygen. Recognizing reduction is essential for comprehending the overall electron transfer in redox reactions.

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