IB Chem Oxidation Reduction

Oxidation is

• gain of electrons

• loss of electrons

• gain of protons

• loss of protons

Tags

NGSS.HS-PS1-1

Reduction is

• gain of electrons

• loss of electrons

• gain of protons

• loss of protons

An oxidizing agent is the substance that is

• oxidized

• reduced

• not changed

A reducing agent is the substance that is

• oxidized

• reduced

• not changed

How is an oxidation state written?

• sign given before the number (+2)

• sign given after the number (2+)

Which element(s) have variable oxidation numbers?

• Most transition metals

• Most main-group non-metals

• Most main-group metals

• All elements

The activity series ranks metals according to the ease with which they undergo

• oxidation

• reduction

• neutralization

• combustion

What is BOD?

• biological oxygen demand

• biological oxidation directive

• binary open distruption

• biological oxygen direction

Tags

NGSS.HS-LS1-7

What method is used to measure BOD?

• The Winkler Method

• Manganate(VII) Method

• Iodine-thiosulfate Method

• Oxidation Method

The equivalence point of the redox reaction between MnO₄^- and Fe²⁺ ions is completed when the color changes from

• deep purple to colorless

• colorless to deep purple