Oxidation and Reduction Concepts

This video is the second part of a series on oxidation-reduction reactions, focusing on electron exchange. It redefines oxidation as the loss of electrons and reduction as the gain of electrons, using the mnemonic OIL RIG. The video provides examples, such as lithium and mercury reactions, and discusses the oxidation of hemoglobin and transition metals. It also covers the redox reaction between chromium and manganese, explaining the concept of half equations.

What is the mnemonic that helps remember the concept of oxidation and reduction?

• OIL RIG

• ELECTRON EXCHANGE

• RED OX

• GAIN LOSS

In the context of electron exchange, what happens to an element when it gains electrons?

• It becomes more negative

• It remains neutral

• It loses mass

• It becomes more positive

In the reaction between lithium and mercury, what happens to lithium?

• It remains unchanged

• It forms a gas

• It loses electrons

• It gains electrons

What is the charge of mercury after it collects two electrons?

• Negative

• Positive

• Double positive

• Neutral

What happens to iron in hemoglobin when it takes up oxygen?

• It is reduced

• It is oxidized

• It remains the same

• It forms a new compound

What is the oxidation state change for iron in hemoglobin when it binds oxygen?

• From 2+ to 3+

• From 0 to 2+

• From 3+ to 2+

• From 2+ to 0

Which metal is reduced in the reaction between chromium and manganese?

• Chromium

• Manganese

• Lithium

• Iron

What role does manganese play in the reaction with chromium?

• Inhibitor

• Catalyst

• Reductant

• Oxidant

What is the stable oxidation state of chromium after it reacts with manganese?

• 0

• 2+

• 3+

• 6+

In a real reaction, what makes it difficult to see what is being oxidized and reduced?

• The presence of gases

• The involvement of compounds

• The color change

• The temperature change