CHE101 Grundlagen der Allgemeinen Chemie

Flashcards created for key concepts discussed in the CHE101 lecture on redox reactions and their fundamental principles.

What is reduction defined as in redox reactions?

Reduction is defined as the uptake of electrons by an atomic or molecular particle.

What is oxidation defined as in redox reactions?

Oxidation is described as the release of electrons.

What are redox reactions?

Redox reactions are processes where reduction and oxidation occur simultaneously and are inseparably linked.

What is an oxidizing agent?

An oxidizing agent is a substance that accepts electrons in a redox reaction.

What is a reducing agent?

A reducing agent is a substance that donates electrons in a redox reaction.

What happens at the anode during electrolysis?

At the anode, oxidation occurs and anions migrate to it.

What happens at the cathode during electrolysis?

At the cathode, reduction occurs and cations migrate to it.

How are oxidation numbers related to redox processes?

Oxidation numbers indicate how strongly an atom in a compound is oxidized or reduced and help trace electron transfer in reactions.

What is the significance of the Nernst equation?

The Nernst equation relates the concentration of reactants and products to their electrochemical potential, allowing the determination of potentials under non-standard conditions.

What do Frost diagrams represent?

Frost diagrams are graphical representations showing the relative stability of oxidation states of an element in relation to each other.

What is disproportionation in the context of redox reactions?

Disproportionation is a redox reaction where a single species is simultaneously oxidized and reduced.

What effect does increasing the temperature have on reaction rates?

Increasing the temperature generally increases reaction rates by providing more energy to overcome the activation energy barrier.

What is a catalyst and how does it work?

A catalyst is a substance that increases the rate of a reaction without undergoing permanent changes itself by lowering the activation energy.

What is the relationship between standard potentials and spontaneity of reactions?

The difference in standard potentials (ΔE°) between two half-cells indicates the spontaneity of a redox reaction, with more positive values indicating spontaneity.

What is the role of the standard hydrogen electrode (SHE)?

The SHE is used as a reference electrode and has a defined potential of 0 V.

How do oxidation states affect the reactivity of metals in acid solutions?

Metals with a standard reduction potential lower than that of hydrogen (negative E°) will dissolve in acids, while those with a higher potential will not.