1. គណនាចំនួនអុកស៊ីតកម្ម នៃស្ពាន់ធ័រ ដែលមានប្រភេទគីមី ដូចជា:
S²- , SO2 , S2O8^2- , H2SO4 , Na2S  ។
2. សរសេរសមីការតុល្យការ តាងប្រតិកម្មកើតឯងរវាងគូរេដុក ខាងក្រោម ក្នុងមជ្ឈដ្ឋានអាស៊ីត :
ក. Fe³+/Fe²+ E= 0,77V និង Cr2O7^2-/Cr³ E°= 1.33V
ខ. MnO4^-/Mn²+ E°= 15.1V និង Br2/Br- E°= 1.06V ។
3. ចូរសរសេររូបមន្តនៃសមាសធាតុ :
ក. អាសុីត2-មេទីលប្រូព្យូនិច
ខ. អាសុីតបង់សូអុិច
គ. 2-មេទីលប៉ង់តាន-3-អូន
ឃ. 2-ក្លរ៉ូ-3-អេទីល- 2-មេទីលអុិចសាណាល់
ង. អុីសូប្រូពីលប៉ង់ទីលសេតូន
ច. 3-ផេនីលអិចសាណាល់ ។
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Let's address each of your questions step by step.

### 1. Calculation of Oxidation Numbers for Various Sulfur Compounds
To find the oxidation number of sulfur in the given compounds, we apply standard rules for oxidation numbers:

- **S²-**: The oxidation number of sulfur in \(S^{2-}\) is \(-2\).
- **SO₂**: The oxidation number of sulfur in \(SO_2\) is \(+4\).
- **S₂O_8^{2-}**: In \(S_2O_8^{2-}\) (peroxydisulfate ion), the oxidation number of each sulfur atom is \(+6\).
- **H₂SO₄**: In \(H_2SO_4\) (sulfuric acid), the oxidation number of sulfur is \(+6\).
- **Na₂S**: In \(Na_2S\), the oxidation number of sulfur is \(-2\).

### 2. Writing Balanced Redox Equations in Acidic Medium

#### a. **Fe³+/Fe²+** and **Cr₂O₇²⁻/Cr³⁺**:
Given:
- \(E^\circ\) for \(Fe^{3+}/Fe^{2+}\) = 0.77 V
- \(E^\circ\) for \(Cr_2O_7^{2-}/Cr^{3+}\) = 1.33 V

The balanced redox reaction in acidic medium is:

\[ Cr_2O_7^{2-} + 14H^+ + 6Fe^{2+} \rightarrow 2Cr^{3+} + 7H_2O + 6Fe^{3+} \]

#### b. **MnO₄⁻/Mn²⁺** and **Br₂/Br⁻**:
Given:
- \(E^\circ\) for \(MnO_4^-/Mn^{2+}\) = 1.51 V
- \(E^\circ\) for \(Br_2/Br^-\) = 1.06 V

The balanced redox reaction in acidic medium is:

\[ 2MnO_4^- + 16H^+ + 10Br^- \rightarrow 2Mn^{2+} + 8H_2O + 5Br_2 \]

### 3. Writing Molecular Formulas for the Given Organic Compounds

#### a. **2-Methylpropionic Acid**:
The formula for 2-methylpropionic acid is \(CH_3CH(CH_3)COOH\).

#### b. **Benzoic Acid**:
The formula for benzoic acid is \(C_6H_5COOH\).

#### c. **2-Methylpentan-3-one**:
The formula for 2-methylpentan-3-one is \(CH_3CH_2COCH(CH_3)CH_3\).

#### d. **2-Chloro-3-ethyl-2-methyloxirane**:
The formula for 2-chloro-3-ethyl-2-methyloxirane is \(C_2H_5C(Cl)C(CH_3)O\).

#### e. **Isopropylbenzyl Ketone**:
The formula for isopropylbenzyl ketone is \(C_6H_5COCH_2CH(CH_3)_2\).

#### f. **3-Phenylpropanal**:
The formula for 3-phenylpropanal is \(C_6H_5CH_2CH_2CHO\).

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### Additional Questions:
1. What are the steps to balance redox reactions in basic medium?
2. How can you determine the oxidation number in complex ions?
3. What is the significance of the electrode potential in redox reactions?
4. Can you explain the IUPAC naming rules for organic compounds?
5. How do you identify the reducing and oxidizing agents in a redox reaction?
6. What is the difference between oxidation states and formal charges?
7. How does the presence of substituents affect the physical properties of organic compounds?
8. What is the role of acid and base catalysis in organic reactions?

**Tip:** To remember oxidation states, start with common elements like oxygen and hydrogen, and then assign states to other elements based on known compounds.

Explore how to calculate oxidation numbers of sulfur compounds, write balanced redox equations, and name organic compounds. This guide covers key concepts in chemistry, suitable for high school students and chemistry enthusiasts.

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