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Grade 12 STUDENTS group👀

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🔬 Remedial Chemistry – Unit 6 Part 1
📚 CALII Academy
We Learn for Others

⚖️ Chemical Equilibrium

📌A reversible reaction ♻️ is one where reactants convert into products, but the products can also revert to reactants, forming an equilibrium mixture. For example:

⚗️ H₂(g) + I₂(g) ⇌ 2HI(g)

📌Chemical equilibrium:- occurs when macroscopic properties (temperature 🌡️, pressure ⚖️, volume 📏, and concentration ⚗️) remain unchanged over time. In a closed system 🔒, both the forward and reverse reactions continue dynamically, but at equilibrium, their rates become equal ➡️⬅️, leading to no net change in concentration.

For a general reversible reaction:

aA + bB ⇌ mM + nN

Rate of forward reaction 🔄:
rf = kf [A]ᵃ [B]ᵇ

Rate of reverse reaction 🔄:
rb = kb [M]ᵐ [N]ⁿ

At equilibrium, rf = rb, leading to the equilibrium constant expression:

🧪 Kc = [M]ᵐ [N]ⁿ / [A]ᵃ [B]ᵇ

For gases, the equilibrium constant is expressed in partial pressures as Kp 🌬️.

📌 Example Calculation:

For the reaction:

2SO₂(g) + O₂(g) ⇌ 2SO₃(g)

Given equilibrium concentrations:
🔹 [SO₂] = 0.90 M
🔹 [O₂] = 0.35 M
🔹 [SO₃] = 1.1 M

The equilibrium constant is:
Kc = [SO₃]² / [SO₂]² [O₂]

📍This concept is fundamental in understanding how reactions reach stability ⚖️ and how external factors influence chemical equilibrium 🔬.

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Grade 12 STUDENTS group👀

1. Where does translation occur in a eukaryotic cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Golgi apparatus

Answer: B
Explanation: Translation, the process of protein synthesis from mRNA, occurs at ribosomes in the cytoplasm or on the rough ER.

2. What type of RNA carries amino acids to the ribosome?
A) mRNA
B) tRNA
C) rRNA
D) snRNA

Answer: B
Explanation: tRNA (transfer RNA) transports specific amino acids to the ribosome during translation, matching codons on the mRNA.

3. What is the product of transcription?
A) DNA
B) tRNA
C) mRNA
D) Protein

Answer: C
Explanation: Transcription is the process where a DNA sequence is copied into mRNA in the nucleus.

4. Which of the following molecules is NOT directly involved in protein synthesis?
A) DNA
B) mRNA
C) rRNA
D) Glucose

Answer: D
Explanation: Glucose is involved in energy metabolism, not protein synthesis.

5. What is a codon?
A) A triplet of DNA bases
B) A sugar molecule
C) A section of protein
D) A sequence of three RNA bases coding for an amino acid

Answer: D
Explanation: Codons are sequences of three RNA nucleotides that specify particular amino acids during translation.

6. What is the main product of photosynthesis in plants?
A) Protein
B) Cellulose
C) Glucose
D) ATP

Answer: C
Explanation: Plants synthesize glucose during photosynthesis, which they can use for energy or convert into starch/cellulose.

7. Which enzyme catalyzes the synthesis of starch from glucose in plants?
A) Amylase
B) Glucose oxidase
C) Starch synthase
D) Lactase

Answer: C
Explanation: Starch synthase helps build starch from glucose units in plant cells.

8. Glycogen is the storage form of carbohydrates in:
A) Plants
B) Bacteria
C) Fungi
D) Animals

Answer: D
Explanation: Animals (including humans) store excess glucose as glycogen, mainly in the liver and muscles.

9. The monomer of carbohydrates is:
A) Amino acid
B) Fatty acid
C) Monosaccharide
D) Nucleotide

Answer: C
Explanation: Carbohydrates are built from monosaccharide units like glucose, fructose, and galactose.

10. What process forms disaccharides from monosaccharides?
A) Hydrolysis
B) Oxidation
C) Dehydration synthesis
D) Photosynthesis

Answer: C
Explanation: In dehydration synthesis, a water molecule is removed to bond two sugar units together (e.g., glucose + fructose → sucrose).

11. Triglycerides are formed from glycerol and:
A) Amino acids
B) Nucleotides
C) Fatty acids
D) Sugars

Answer: C
Explanation: A triglyceride is composed of one glycerol molecule bonded to three fatty acids.

12. What type of bond forms between fatty acids and glycerol?
A) Hydrogen bond
B) Peptide bond
C) Ester bond
D) Glycosidic bond

Answer: C
Explanation: Ester bonds link fatty acids to glycerol in lipids through a condensation reaction.

13. Nucleotides are joined together by:
A) Peptide bonds
B) Glycosidic linkages
C) Phosphodiester bonds
D) Ester bonds

Answer: C
Explanation: Phosphodiester bonds connect the phosphate group of one nucleotide to the sugar of the next, forming the backbone of DNA/RNA.

14. Which component is NOT part of a nucleotide?
A) Phosphate group
B) Sugar
C) Amino acid
D) Nitrogenous base

Answer: C
Explanation: Amino acids are the building blocks of proteins, not nucleotides.

15. DNA replication is essential for:
A) Protein synthesis
B) Energy production
C) Cell division
D) Photosynthesis

Answer: C
Explanation: DNA must replicate before a cell divides to ensure each daughter cell receives a complete copy of the genetic material.


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ድርጅታችን ምንም አይነት የትምህርት ደረጃ እንዲሁም የስራ ልምድ የማይጠይቅ ሲሆን ስራ በመስራት ላይ እና በትምህርት ላይ የምትገኙ በትርፍ ጊዜያቹሁ መስራት የምትችሉበትን ዕድል አመቻችቷል ።

ከእናንተ የሚጠበቀው ድርጅታችን በአካል በመምጣት ሙሉውን መረጃ መውሰድ ይኖርባችኋል።
ክልል ላይ ያላችሁም ስራ ፈላጊዎች ካላቹህ በየከተማው ቅርንጫፎች ስላሉን የእድሉ ተጠቃሚ መሆን ትችላላችሁ ።
........Addis Abeba
.........Hawassa
......Adama
.....Mekele
እና ሌሎችም...

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Grade 12 STUDENTS group👀

💵💵ብዙዎች በቴሌግራም ብዙ ብር እየሰሩ ነው እናንተም ሰው በመጋበዝ ብቻ ብዙ ብር መስራት ትችላላችሁ።💰💰

➡️በጣም ገርሞኛል ከስንት ሙከራዎች በኋላ ነው ይሄን ትክክለኛ ቦት ያገኘሁት💯💯💯

እንዳያመልጣችሁ⬇️⬇️⬇️
/channel/+bupv9S7JgBszZWI0

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