HESI A2 Chemistry Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Explain what a redox reaction is.

A reaction where heat is absorbed

A reaction involving the transfer of electrons between two species

A redox reaction, short for reduction-oxidation reaction, is characterized by the transfer of electrons between two species. In these reactions, one species undergoes oxidation, losing electrons, while another species is reduced, gaining those electrons. This transfer of electrons is fundamental to many chemical and biological processes, as it allows for changes in oxidation states and the formation of new compounds.

The core concept behind redox reactions is that they inherently involve changes in the electrical charge of the involved elements. For example, in the combustion of hydrocarbons, carbon is oxidized to carbon dioxide, while oxygen is reduced, illustrating this electron transfer process clearly. Understanding redox reactions is crucial for comprehending various chemical reactions, including those occurring in batteries, metabolic pathways, and corrosion.

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A reaction focused on the exchange of protons

A reaction that does not involve any energy transfer

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