أسئلة الكيمياء الصف التاسع مع الحل

15 سؤالاً تدريبياً في الكيمياء – الصف التاسع

1. الفصل: The Atom · سهل

   1. Which particle carries a positive charge?

   • A. the electron
   • B. the proton
   • C. the neutron
   • D. the nucleon
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   Answer: the proton

   Explanation: Protons are positive, electrons negative, neutrons neutral.

2. الفصل: The Atom · سهل

   2. Which term matches this definition: "an energy level around the nucleus that can hold a limited number of electrons"?

   • A. electron shell
   • B. proton
   • C. cation
   • D. nucleon
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   Answer: electron shell

   Explanation: Electron shell: an energy level around the nucleus that can hold a limited number of electrons

3. الفصل: Chemical Bonds · سهل

   3. Which term matches this definition: "a covalent bond made of three shared pairs of electrons"?

   • A. lone pair
   • B. triple bond
   • C. covalence
   • D. metallic bond
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   Answer: triple bond

   Explanation: Triple bond: a covalent bond made of three shared pairs of electrons

4. الفصل: Chemical Bonds · سهل

   4. What is the meaning of "covalence"?

   • A. a neutral group of atoms held together by covalent bonds
   • B. the regular three-dimensional arrangement of ions in an ionic solid
   • C. the number of covalent bonds an atom usually forms
   • D. the electrostatic attraction between a cation and an anion after an electron transfer
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   Answer: the number of covalent bonds an atom usually forms

   Explanation: Covalence: the number of covalent bonds an atom usually forms

5. الفصل: Oxidation and Reduction · سهل

   5. Which term matches this definition: "the equation of one couple showing the electrons exchanged"?

   • A. metal extraction
   • B. galvanization
   • C. corrosion
   • D. half-equation
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   Answer: half-equation

   Explanation: Half-equation: the equation of one couple showing the electrons exchanged

6. الفصل: Oxidation and Reduction · سهل

   6. What is the meaning of "reducing agent"?

   • A. the reduction of a metal ore (oxide) to obtain the free metal
   • B. a species that captures electrons and is reduced
   • C. a metal such as gold or silver that is very hard to oxidize
   • D. a species that gives electrons and is oxidized
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   Answer: a species that gives electrons and is oxidized

   Explanation: Reducing agent: a species that gives electrons and is oxidized

7. الفصل: Cells and Batteries · سهل

   7. Which term matches this definition: "a cell made of a zinc half-cell and a copper half-cell joined by a salt bridge"?

   • A. electrolyte
   • B. standard potential
   • C. Daniell cell
   • D. anode of a cell
   أظهر الجواب ▾

   Answer: Daniell cell

   Explanation: Daniell cell: a cell made of a zinc half-cell and a copper half-cell joined by a salt bridge

8. الفصل: Cells and Batteries · سهل

   8. Which term matches this definition: "the potential of a redox couple measured against the hydrogen electrode"?

   • A. electrolyte
   • B. half-cell
   • C. standard potential
   • D. salt bridge
   أظهر الجواب ▾

   Answer: standard potential

   Explanation: Standard potential: the potential of a redox couple measured against the hydrogen electrode

9. الفصل: Electrolysis · سهل

   9. In a Hoffman voltameter, 10 cm³ of dioxygen are collected. What volume of dihydrogen is collected at the same time?

   • A. 10
   • B. 20
   • C. 5
   • D. 40
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   Answer: 20

   Explanation: V(H₂) = 2 × V(O₂) = 20 cm³.

10. الفصل: Electrolysis · سهل

    10. Electrolysis converts…

    • A. electrical energy into chemical energy
    • B. heat into light
    • C. chemical energy into electrical energy
    • D. mechanical energy into heat
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    Answer: electrical energy into chemical energy

    Explanation: The reverse of a cell.

11. الفصل: Organic and Inorganic Compounds · سهل

    11. How would you classify calcium carbonate CaCO₃?

    • A. organic (it contains a carbon chain)
    • B. inorganic
    • C. a hydrocarbon
    • D. an alcohol
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    Answer: inorganic

    Explanation: CaCO₃ has no carbon chain: inorganic.

12. الفصل: Organic and Inorganic Compounds · سهل

    12. Which term matches this definition: "an organic compound carrying the hydroxyl group –OH on a carbon chain"?

    • A. molecular formula
    • B. functional group
    • C. isomers
    • D. alcohol
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    Answer: alcohol

    Explanation: Alcohol: an organic compound carrying the hydroxyl group –OH on a carbon chain

13. الفصل: Hydrocarbons · سهل

    13. What is the meaning of "cyclic hydrocarbon"?

    • A. a saturated hydrocarbon of general formula CₙH₂ₙ₊₂ with only single bonds
    • B. a family of compounds with the same general formula whose members differ by CH₂
    • C. a hydrocarbon whose carbon chain is closed into a ring
    • D. an unsaturated hydrocarbon of general formula CₙH₂ₙ₋₂ containing one C≡C triple bond
    أظهر الجواب ▾

    Answer: a hydrocarbon whose carbon chain is closed into a ring

    Explanation: Cyclic hydrocarbon: a hydrocarbon whose carbon chain is closed into a ring

14. الفصل: Hydrocarbons · سهل

    14. Which term matches this definition: "a saturated hydrocarbon of general formula CₙH₂ₙ₊₂ with only single bonds"?

    • A. alkane
    • B. ethene (ethylene)
    • C. alkene
    • D. saturated hydrocarbon
    أظهر الجواب ▾

    Answer: alkane

    Explanation: Alkane: a saturated hydrocarbon of general formula CₙH₂ₙ₊₂ with only single bonds

15. الفصل: Properties of Hydrocarbons · سهل

    15. Which term matches this definition: "a substance burnt to release energy"?

    • A. polyethylene
    • B. hydrogenation
    • C. fuel
    • D. substitution reaction
    أظهر الجواب ▾

    Answer: fuel

    Explanation: Fuel: a substance burnt to release energy

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