Electrochemistry. (Chapter 6)

Сентябрь 6, 2022

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Electrochemistry. (Chapter 6)

Содержание

2. Oxidation-Reduction Reactions Electron transfer reactions are called oxidation-reduction or redox reactions. Charges of elements are zero.
3. Chapter 6 Oxidation-Reduction Reactions Na → Na+1 + 1e- oxidation Cl2 + 2e- → 2Cl-1 reduction
4. Chapter 6 Oxidation-Reduction Reactions Example 1 Mg and O2 react to form MgO. What are the
5. Chapter 6 Oxidation-Reduction Reactions Oxidation States Oxidation states of the elements must be known to balance
6. Chapter 6 Oxidation-Reduction Reactions Example 2 Find the oxidation state of metals in the following species.
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Слайд 2

Oxidation-Reduction Reactions
Electron transfer reactions are called oxidation-reduction or
redox reactions.
Charges

of elements are zero.
Sum of charges of elements in a compound is equal to zero.
Oxidation is loss of electrons. ( losing e )
Reduction is gain of electrons. ( taking e )
Oxidizing agent is Oxidizes other element. (take electron)
Reducing agent is Reduces other element.(loses electron)

Слайд 3

Chapter 6
Oxidation-Reduction Reactions
Na → Na+1 + 1e- oxidation
Cl2 + 2e- → 2Cl-1 reduction
Here,

Na is reducing agent, while Cl2 is oxidizing agent.

Слайд 4

Chapter 6
Oxidation-Reduction Reactions
Example 1
Mg and O2 react to form MgO. What

are the oxidizing and reducing agents?

Solution
2Mg + O2 → 2MgO
Mg undergoes oxidation process, it is called reducing agent.
O2 undergoes reduction process, it is called oxidizing agent.

Слайд 5

Chapter 6
Oxidation-Reduction Reactions
Oxidation States
Oxidation states of the elements must be known

to
balance redox reactions.
Oxidation states of elements in most stable form is zero,
like Fe, Cu, Ag, O2, H2, P, S, P4…etc
Group IA have +1, and Group IIA have +2 and Group IIIA
have +3, Halogens have -1 oxidation states.
Hydrogen in metal hydrates has -1 oxidation state.
Sum of the oxidation states in compounds is zero, in ions
is equal to charge of ion.

Слайд 6

Chapter 6
Oxidation-Reduction Reactions
Example 2
Find the oxidation state of metals in the

following species.
A. FeO B. KMnO4 C. Na2Cr2O7 D. HgOH

Solution
x + -2 = 0 → x = +2
+1 + x + 4(-2) = 0 → x = +7
2(+1) + 2x + 7(-2) = 0 → x = +6
x + (-2) + 1 = 0 → x = + 1

Electrochemistry. (Chapter 6)

Содержание

Oxidation-Reduction ReactionsElectron transfer reactions are called oxidation-reduction or redox reactions. Charges

Chapter 6Oxidation-Reduction Reactions Na → Na+1 + 1e- oxidation Cl2 + 2e- → 2Cl-1 reductionHere,

Chapter 6Oxidation-Reduction ReactionsExample 1Mg and O2 react to form MgO. What

Chapter 6Oxidation-Reduction ReactionsOxidation StatesOxidation states of the elements must be known

Chapter 6Oxidation-Reduction ReactionsExample 2Find the oxidation state of metals in the

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Oxidation-Reduction Reactions
Electron transfer reactions are called oxidation-reduction or
redox reactions.
Charges

Chapter 6
Oxidation-Reduction Reactions
Na → Na+1 + 1e- oxidation
Cl2 + 2e- → 2Cl-1 reduction
Here,

Chapter 6
Oxidation-Reduction Reactions
Example 1
Mg and O2 react to form MgO. What

Chapter 6
Oxidation-Reduction Reactions
Oxidation States
Oxidation states of the elements must be known

Chapter 6
Oxidation-Reduction Reactions
Example 2
Find the oxidation state of metals in the