Compound effect
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for grade 11 students
πŸ‘2
for grade 11 students
afbau's principle
❀1
for grade 11 students
atomic radius
for grade 10 students
for grade 10 students
for grade 10 stuent's
1. What is a homogeneous mixture?
– A) A mixture with a uniform composition throughout
– B) A mixture with distinct layers
– C) A mixture that settles over time
– D) A mixture that can be separated by filtration
Answer: A

2. Which of the following is an example of a heterogeneous mixture?
– A) Saltwater
– B) Air
– C) Salad
– D) Vinegar
Answer: C

3. What type of mixture is a solution?
– A) A homogeneous mixture
– B) A heterogeneous mixture
– C) A colloid
– D) A suspension
Answer: A

4. Which of the following best describes a colloid?
– A) A mixture where particles are evenly distributed and do not settle
– B) A mixture that can be seen and separated easily
– C) A solid that dissolves in a liquid
– D) A gas that can be compressed
Answer: A

5. Which of the following is NOT a characteristic of a suspension?
– A) Particles settle over time
– B) Particles are visible to the naked eye
– C) It has a uniform composition
– D) It can be separated by filtration
Answer: C

6. Which of the following is an example of a colloid?
– A) Sugar dissolved in water
– B) Muddy water
– C) Milk
– D) Ice cubes in soda
Answer: C

7. What type of colloid consists of liquid droplets dispersed in another liquid?
– A) Aerosol
– B) Emulsion
– C) Foam
– D) Sol
Answer: B

8. Which of the following statements about solutions is true?
– A) Solutions can have varying compositions.
– B) Solutions always contain a solid solute.
– C) Solutions are always transparent.
– D) Solutions cannot conduct electricity.
Answer: C

9. Which type of solution has a solute concentration greater than that of a saturated solution?
– A) Unsaturated solution
– B) Saturated solution
– C) Supersaturated solution
– D) Dilute solution
Answer: C

10. Which of the following is an example of a suspension?
– A) Coffee
– B) Orange juice with pulp
– C) Steel wool in water
– D) Carbonated water
for grade 11 students
1. Atomic Size
Which of the following elements has the largest atomic radius?
A) Helium
B) Lithium
C) Sodium
D) Potassium
Answer:
2. Ionization Energy
Which element has the highest first ionization energy?
A) Neon
B) Fluorine
C) Oxygen
D) Nitrogen
Answer

3. Electron Affinity
Which of the following elements has the most negative electron affinity?
A) Chlorine
B) Argon
C) Sodium
D) Magnesium
Answer:

4. Electronegativity
Which of the following elements is the most electronegative?
A) Carbon
B) Nitrogen
C) Oxygen
D) Fluorine
Answer:

5. Metallic Character
Which of the following elements exhibits the greatest metallic character?
A) Aluminum
B) Silicon
C) Phosphorus
D) Sulfur
Answer:
6. Periodic Classification
The periodic classification of elements is important because it:
A) Helps in predicting the properties of elements.
B) Groups all metals together.
C) Arranges elements in alphabetical order.
D) Eliminates the need for chemical formulas.
Answer:
7. Atomic Size Trend
As you move down a group in the periodic table, atomic size:
A) Decreases
B) Increases
C) Remains constant
D) Fluctuates unpredictably
Answer:

8. Ionization Energy Trend
Ionization energy generally:
A) Increases from left to right across a period.
B) Decreases from top to bottom in a group.
C) Both A and B are correct.
D) Neither A nor B is correct.
Answ
9. Electronegativity Trend
Electronegativity tends to:
A) Increase down a group.
B) Decrease across a period from left to right.
C) Increase across a period from left to right.
D) Remain constant across a period.
Answer:

10. Importance of Periodic Table
Which of the following statements best describes the significance of the periodic table?
A) It organizes elements based on their atomic mass only.
B) It provides a framework for understanding chemical behavior and relationships among elements.
C) It is solely based on historical discoveries in chemistry.
D) It categorizes elements without any scientific basis.
Answer:
❀2
Channel photo updated
For grade eleventh students
Here are 20 multiple-choice questions covering the specified topics related to chemical bonds:

β–ŽQuestions

1. What is the octet rule?
   – A) Atoms tend to lose electrons to achieve a full outer shell.
   – B) Atoms tend to gain, lose, or share electrons to have eight electrons in their outer shell.
   – C) Atoms can only bond with other atoms of the same element.
   – D) Atoms prefer to exist as single entities.

2. Which of the following best describes a covalent bond?
   – A) Transfer of electrons from one atom to another.
   – B) Sharing of electron pairs between atoms.
   – C) Attraction between oppositely charged ions.
   – D) A weak interaction between molecules.

3. In a Lewis structure, what do dots represent?
   – A) Electrons in the nucleus.
   – B) Valence electrons of an atom.
   – C) Bonding pairs of electrons.
   – D) Non-bonding pairs of electrons.

4. What is lattice energy?
   – A) Energy required to form a covalent bond.
   – B) Energy released when gaseous ions form an ionic solid.
   – C) Energy needed to break a covalent bond.
   – D) Energy associated with the formation of resonance structures.

5. According to the Born-Haber cycle, which factor is NOT considered in calculating lattice energy?
   – A) Ionization energy
   – B) Electron affinity
   – C) Electronegativity
   – D) Sublimation energy

6. Which of the following factors affects the formation of ionic bonds?
   – A) Ion size
   – B) Ion charge
   – C) Lattice structure
   – D) All of the above

7. Which of the following is an exception to the octet rule?
   – A) Neon
   – B) Boron
   – C) Carbon
   – D) Oxygen

8. What property is characteristic of ionic compounds?
   – A) They are typically gases at room temperature.
   – B) They have low melting and boiling points.
   – C) They conduct electricity when dissolved in water.
   – D) They are usually nonpolar.

9. Covalent bonds are formed by:
   – A) The transfer of electrons.
   – B) The sharing of electron pairs between atoms.
   – C) The attraction between ions.
   – D) The interaction of dipoles.

10. What distinguishes a coordinate covalent bond from a regular covalent bond?
    β–ͺ A) It involves only one atom donating both electrons for the bond.
    β–ͺ B) It involves sharing of electrons between two atoms equally.
    β–ͺ C) It is always weaker than a regular covalent bond.
    β–ͺ D) It can only occur between identical atoms.

11. What is a resonance structure?
    β–ͺ A) A structure that shows different ways to arrange atoms in a molecule.
    β–ͺ B) A structure that represents a single arrangement of electrons.
    β–ͺ C) A temporary state of a molecule during a reaction.
    β–ͺ D) A structure that cannot exist in reality.

12. Which of the following molecules is polar?
    β–ͺ A)  COβ‚‚
    β–ͺ B)  CHβ‚„
    β–ͺ C)  Hβ‚‚O
    β–ͺ D)  Nβ‚‚

13. What does a dipole moment indicate?
    β–ͺ A) The strength of ionic bonds in a compound.
    β–ͺ B) The presence and direction of polarity in a molecule.
    β–ͺ C) The total number of bonds in a molecule.
    β–ͺ D) The energy required to break a bond.

14. Which type of bond is formed between two nonmetals?
    β–ͺ A) Ionic bond
    β–ͺ B) Metallic bond
    β–ͺ C) Covalent bond
    β–ͺ D) Hydrogen bond

15. Which element typically forms coordinate covalent bonds?
    β–ͺ A) Helium
    β–ͺ B) Oxygen
    β–ͺ C) Nitrogen
    β–ͺ D) Boron

16. In which situation would you expect to find a high lattice energy?
    β–ͺ A) Small ions with high charges.
    β–ͺ B) Large ions with low charges.
    β–ͺ C) Ions with similar sizes and charges.
    β–ͺ D) Ions with no charge.

17. Which molecule has resonance structures?
    β–ͺ A)  Oβ‚‚
    β–ͺ B)  NO₃⁻
    β–ͺ C)  NaCl
    β–ͺ D)  Hβ‚‚

18. What type of bond is present in  HCl ?
    β–ͺ A) Ionic bond
    β–ͺ B) Nonpolar covalent bond
    β–ͺ C) Polar covalent bond
    β–ͺ D) Metallic bond

19. Which of the following statements about ionic compounds is FALSE?
❀2
For grade eleventh students
Measuring Bond Angles with X-ray Crystallography
https://www.youtube.com/watch?v=xiwDvXybfrk
Grade eleventh students
Grade eleventh chemistry
β–ŽQuestion 1

What does VSEPR stand for?
β€’ A) Valence Shell Electron Pair Repulsion
β€’ B) Valence Shell Electron Probability Repulsion
β€’ C) Valence Shell Energy Pair Repulsion
β€’ D) Valence Shell Electron Pair Reaction

Answer

---

β–ŽQuestion 2

According to VSEPR theory, the shape of a molecule is primarily determined by:
β€’ A) The number of protons in the nucleus
β€’ B) The arrangement of electrons around the central atom
β€’ C) The type of chemical bonds present
β€’ D) The molecular weight of the compound

Answer:
---

β–ŽQuestion 3

What is the molecular geometry of a molecule with the formula  ABβ‚‚  where  A  is the central atom and there are no lone pairs?
β€’ A) Linear
β€’ B) Bent
β€’ C) Tetrahedral
β€’ D) Trigonal planar

Answer:
---

β–ŽQuestion 4

Which of the following molecular geometries corresponds to a molecule with the formula  AB₃E ?
β€’ A) Tetrahedral
β€’ B) Trigonal bipyramidal
β€’ C) Trigonal planar
β€’ D) Seesaw

Answe

---

β–ŽQuestion 5

In a molecule represented as  ABβ‚‚Eβ‚‚ , what is the arrangement of electron pairs around the central atom?
β€’ A) Linear
β€’ B) Tetrahedral
β€’ C) Trigonal planar
β€’ D) Octahedral

Answer

---

β–ŽQuestion 6

For a molecule with the formula  ABβ‚„ , what is the expected molecular shape?
β€’ A) Square planar
β€’ B) Tetrahedral
β€’ C) Octahedral
β€’ D) Linear

Answer:

---

β–ŽQuestion 7

Which of the following statements is true regarding molecules with one or more lone pairs on the central atom?
β€’ A) They always have symmetrical shapes.
β€’ B) They can lead to distorted geometries.
β€’ C) They cannot participate in bonding.
β€’ D) They have no effect on molecular shape.

Answer:
---

β–ŽQuestion 8

What is the molecular geometry of  AB₃E₃ ?
β€’ A) T-shaped
β€’ B) Octahedral
β€’ C) Square planar
β€’ D) Trigonal bipyramidal

Answer:

β–ŽQuestion 9

When applying VSEPR theory, which of the following factors should be considered?
β€’ A) Electronegativity differences between atoms
β€’ B) Number of lone pairs on the central atom
β€’ C) Molecular weight of the compound
β€’ D) Bonding energy of the atoms involved

Answer:
---

β–ŽQuestion 10

In which molecular geometry do all bond angles measure approximately 109.5 degrees?
β€’ A) Tetrahedral
β€’ B) Trigonal planar
β€’ C) Linear
β€’ D) Octahedral

Answer:
❀1
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An Ethiopian Developer Who Once Failed National Exams Built a Platform to Help Others Pass

Since exam reforms in 2022, only about 4.6% of Ethiopian students have passed national entrance exams. One ed-tech startup says the problem isn’t just content, it’s structure.
January 16, 2026
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Daniel Metaferiya

Addis Ababa, Ethiopia

Entering college has become an increasingly fraught milestone for Ethiopian students in recent years. Since reforms to the national examination system in 2022, pass rates have plunged: more than 3.1 million students have sat for the exams over the past four years, and only about 4.6 percent have passed. What was once a difficult rite of passage has become, for many, a near wall.

Facing those odds at the end of high school, students are trying a range of strategies to clear the hurdle. One education-technology startup, founded by a young software engineer who failed the exam on his first attempt, is betting that better structure, not just more study materials, can make the difference.

The platform, TikuretEntrance, was founded by Dagim Wallelgne and is designed to support students from the moment they enter high school, not just in the frantic months before the test. It offers curriculum-aligned lessons, past national exam questions, mock tests, and performance-tracking tools tailored to Ethiopia’s education system. 

β€œNot all students fail because they lack materials,” Dagim told Shega. β€œMany struggle because they lack focus, structure, and regular guidance.”

TikuretEntrance is available in English, Amharic, Afan Oromo, and Tigrinya, widening access for students across regions and language backgrounds. It covers core subjects, including mathematics, natural sciences, English, and civics, combining digital notes with timed practice exams designed to mirror real testing conditions. After each assessment, students receive automated feedback and detailed explanations, helping them identify weak areas and adjust their study plans.

β€œI failed the exam first, not because of academic weakness, but because I lacked structure,” Dagim recalled. β€œThere was also little clarity about what to expect from the exam.”

Since its launch, TikuretEntrance has onboarded more than 200 active users and was part of a startup mentorship program under the Disruptor’s Den, a platform for emerging Ethiopian entrepreneurs.

Through a personalized dashboard, users can access previous entrance exams, build customized study schedules, follow guided learning paths and track progress over time. Performance analytics highlight strengths and gaps across subjects, while an exam-countdown tool helps students plan their preparation more strategically.

The platform also includes study groups and peer-support features, allowing students to revise collaboratively, alongside a growing digital library of learning resources that is updated as curricula change. Additional tools offer revision strategies, preparation tips and early access to new features.

Unlike platforms that emphasize large volumes of downloadable content, TikuretEntrance focuses on consistency and habit-building, encouraging students to study in smaller, regular intervals rather than cramming at the last minute.

To support learners outside school hours, the company offers round-the-clock assistance through WhatsApp and Telegram, where students can ask questions, report technical problems and receive academic guidance. The service is fully mobile-friendly and runs through a web interface rather than a dedicated app, a choice intended to reduce barriers for students using lower-end phones or devices with limited storage.

TikuretEntrance operates on a subscription model, charging 499 Birr for annual access, and is pursuing partnerships with secondary schools as well as referral programs to expand adoption in both public and private institutions.

For now, the platform is ce
ntered on individual learners. But the founders say they are developing tools that would allow parents and schools to monitor student progress, a sign of growing interest in data-driven approaches to exam preparation in a system where the stakes of a single test have rarely felt higher.

πŸ‘ 16

πŸ˜‚ 3

❀️ 2

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Daniel Metaferiya

Daniel Metaferiya is a writer, journalist and radio host, with a keen interest in technology. He follows developments in Ethiopia's startup ecosystem closely and is passionate about profiling unique MSMEs.

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