Important questions for board preparation 9th class Chemistry.
1. Fundamentals of Chemistry
Definition
1. Matter
2. Atom
3. Molecules
4. Substance
5. Elements
6. Valency
7. Compound
8. Mixture
9. Relatinve Atomic Masss
10. Empirical formula and a molecular formula
11. Atomic number and atomic mass number
12. Molecular mass and Formula mass
13. Ions, Molecular ions, and Free Redials.
14. Mole and Avogadro number.
15. Gram Atomic mass
16. Gram Molecular mass
17. Gram Formula mass
Difference Between:
1. Atom and Ions.
2. Molecules and Molecular ions.
3. Ions and Free Redials.
Numerical.
⦁ Mole.
⦁ Avogadro number.
Questions.
1. Define Chemistry
2. Define branches of chemistry?
3. Write down the application of Chemistry in daily life
4. Write down the chemical empirical formula and a molecular formula of the following?
⦁ Sulpher, Carbon dioxide, glucose, and Benzene.
2. Atomic structure
1. Describe the discharge tube cathode rays experiment of the discovery of electrons?
2. Define the properties of cathode rays and electrons also Explain how cathode rays are produced?
3. Define the discovery of protons
4. Define the properties of protons/Canal Rays.
5. Define the discovery of Neutrons
6. Define the properties of Neutrons
7. Define Rutherford's atomic model and explain the Limitations of its model? Discuss the gold metal foil experiment in the light of the structure of an atom?
8. Define Rutherford's Postulates?
9. Define Neil bother's atomic model and explain the Limitations of Neil boher's atomic model. Explain how the bohar atomic model is different from Rutherford's?
10. Describe the modern theories of Atomic structure.
11. Describe the Modern theory De Broglie is related to Eastian and Plank's equation?
12. Describe Schrodinger's atomic model.
13. Describe the Electronic Configuration and Electric Configuration.
14. Difference between shells and Sub Shell.
15. Write the names of Sub atom particles and their masses in a.m.u with their unit charges?
16. What isotopes explain the application of isotopes in daily life?
17. Describe E P N in an atom? How they are present in the following?
I. Fe
II. O
III. Cl
IV. U
V. C
⦁ Define
i. Atomic number (Z)
ii. Mass number(A)
3. Periodic table and Periodicity of Properties.
1. Explain the Modern Periodic Table?
2. Discuss the Mendelvee periodic law provider base for Modern Periodic Table?
3. discuss in detail long from the periodic table? Describe periods in the periodic table?
4. define noble gases' Representative elements
5. Describe Electronegativity within groups and periods with the help of examples?
6. explain the similarity of chemical and physical properties of elements in the same family?
7. Identify which heterogeneous exist as a gas, liquid, and solid?
8. Why does alkaline earth metal show in regular melting and boiling points?
9. Why are Ionization energy, electron affinity, and electronegativity the same trend in period and Groups?
10. Explain how the shielding effect influenced periodic trends?
11. Identify the electron configuration of the following elements? (Na.Ca, F, Si).
12. Periodicity of properties depending on the number of protons in an atom?
⦁ Define
I. Atomic size
II. Atomic radius
III. Electron affinity
IV. Shielding effect
a. Difference between periods and Groups.
4. Chemical bonding
1. DefineChemical Boud?
2. What are valence electons?
3. Define Formation of Chemical Boud and it's types?
4. Ionic Bound?
5. Covelent Bound and thier types?
⦁ Singel Bound
⦁ Formation of Cholorine Molecules
⦁ Double Bound
⦁ Formation of Oxygen Molecules
⦁ Triple Bound
⦁ Formation of NitrogenMolecules
6. Define Ionic Compound?Discuss formaion of NaCl
7. Define concept of Donor and Acceptor
8. Define Metalic bound.How arMetalice bound formed?
9. Define properties Polar Non-Polar compound?
⦁ Define
⦁ Polar .
⦁ Non-Polar.
⦁ Metallic Bound
⦁ Intermolecular Forces
⦁ Dipole -Dipole Interaction
⦁ Hyrogen Bounding
⦁ Covelent Compound
⦁ Polar-Non-Polar Compound
⦁ Metals
⦁ Co-ordinate Bound or dativeBound
