Ch. 20. Oxidation-Reduction Reactions. Types of Reactions. There are many different types of reactions: Redox Acid-Base Precipitation. 20.1 Oxidation and Reduction. Oxidation- Reduction Reaction : reaction in which electrons are transferred from one atom to another AKA- Redox Reaction.
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The, very rusty, Iron hammer is also being oxidized by the Oxygen in the air, but at a much slower rate than the burning wood.
Ionic charge is written with the sign AFTER the number. (3+ , 2-)
Chlorine bleach whitens clothes by oxidizing dyes, stains, and other materials that discolor clothes.
OxiClean contains Hydrogen peroxide which is a strong oxidizing substance which will "bleach" the stains away.
The oxidation number of an uncombined element is zero.
Includes diatomic molecules, subscripts don’t matter.
The oxidation number of a monatomic ion is equal to the charge on the ion.
Oxidation number of Al3+ is +3.
Oxidation number of Ca2+is+2.
The oxidation number of the more electronegative atom in a molecule or complex ion is the same as the charge it would have if it were an ion.
The oxidation number of fluorine (F) is always -1
The sum of the oxidation numbers of all atoms in a polyatomic ion = the charge on the polyatomic ion (look on polyatomic sheet).
Let's start with Carbon Dioxide, CO2.
1. Neutral compound charge = 0
2. Oxygen gets its standard charge of -2 for each oxygen atom.
3. In order to tally to zero, we MUST assign Carbon the oxidation number of +4.
2. Chlorine is the most electronegative element charge of -1 for each Chlorine atom.
3. both Hydrogen atoms are given an oxidation number of +1.
4. In order to tally to zero, we MUST assign Carbon the oxidation number of 0.
-2 for each oxygen atom.