أسئلة الكيمياء الصف السابع مع الحل

15 سؤالاً تدريبياً في الكيمياء – الصف السابع

1. الفصل: Glassware Used in the Chemistry Laboratory · سهل

   1. Which term matches this definition: "a gas burner used to heat substances in the laboratory"?

   • A. graduated cylinder
   • B. crucible
   • C. Bunsen burner
   • D. stirring rod
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   Answer: Bunsen burner

   Explanation: Bunsen burner: a gas burner used to heat substances in the laboratory

2. الفصل: Glassware Used in the Chemistry Laboratory · سهل

   2. Which term matches this definition: "a small curved glass disc used to cover a beaker or evaporate a few drops"?

   • A. crucible
   • B. pipette
   • C. watch glass
   • D. Erlenmeyer flask
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   Answer: watch glass

   Explanation: Watch glass: a small curved glass disc used to cover a beaker or evaporate a few drops

3. الفصل: Classification of Matter · سهل

   3. Which term matches this definition: "a mixture whose components can be seen with the naked eye or a microscope"?

   • A. periodic table
   • B. heterogeneous mixture
   • C. boiling point
   • D. atom
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   Answer: heterogeneous mixture

   Explanation: Heterogeneous mixture: a mixture whose components can be seen with the naked eye or a microscope

4. الفصل: Classification of Matter · سهل

   4. Which term matches this definition: "symbols and numbers showing the elements in a compound, such as H₂O"?

   • A. chemical formula
   • B. mixture
   • C. element
   • D. pure substance
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   Answer: chemical formula

   Explanation: Chemical formula: symbols and numbers showing the elements in a compound, such as H₂O

5. الفصل: Separation Techniques · سهل

   5. Which term matches this definition: "separating by spinning rapidly so that denser particles go to the bottom"?

   • A. centrifugation
   • B. decantation
   • C. distillation
   • D. fractional distillation
   أظهر الجواب ▾

   Answer: centrifugation

   Explanation: Centrifugation: separating by spinning rapidly so that denser particles go to the bottom

6. الفصل: Separation Techniques · سهل

   6. Which term matches this definition: "separating solid grains of different sizes with a sieve"?

   • A. sieving
   • B. evaporation
   • C. magnetic separation
   • D. filtration
   أظهر الجواب ▾

   Answer: sieving

   Explanation: Sieving: separating solid grains of different sizes with a sieve

7. الفصل: Solutions · سهل

   7. Which term matches this definition: "the mass of the solution equals the mass of solute plus the mass of solvent"?

   • A. soluble
   • B. conservation of mass in dissolving
   • C. insoluble
   • D. miscible liquids
   أظهر الجواب ▾

   Answer: conservation of mass in dissolving

   Explanation: Conservation of mass in dissolving: the mass of the solution equals the mass of solute plus the mass of solvent

8. الفصل: Solutions · سهل

   8. Which term matches this definition: "able to dissolve in a given solvent"?

   • A. dissolving
   • B. dilution
   • C. soluble
   • D. concentrated solution
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   Answer: soluble

   Explanation: Soluble: able to dissolve in a given solvent

9. الفصل: Colloids and Suspensions · سهل

   9. What is the meaning of "turbidity"?

   • A. that lets light pass through so that objects can be seen behind it
   • B. the property that decides whether a mixture is a solution, a colloid or a suspension
   • C. the cloudiness of water caused by suspended or colloidal particles
   • D. the substance that is spread out in small particles in a colloid
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   Answer: the cloudiness of water caused by suspended or colloidal particles

   Explanation: Turbidity: the cloudiness of water caused by suspended or colloidal particles

10. الفصل: Colloids and Suspensions · سهل

    10. What is the meaning of "emulsifier"?

    • A. a substance that keeps an emulsion stable, such as egg yolk in mayonnaise
    • B. the substance that is spread out in small particles in a colloid
    • C. a colloid of gas bubbles dispersed in a liquid or a solid
    • D. having the same composition and appearance everywhere
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    Answer: a substance that keeps an emulsion stable, such as egg yolk in mayonnaise

    Explanation: Emulsifier: a substance that keeps an emulsion stable, such as egg yolk in mayonnaise

11. الفصل: Reactants and Products · سهل

    11. Which term matches this definition: "the release of gas bubbles during a reaction"?

    • A. effervescence
    • B. carbon dioxide
    • C. closed system
    • D. product
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    Answer: effervescence

    Explanation: Effervescence: the release of gas bubbles during a reaction

12. الفصل: Reactants and Products · سهل

    12. What is the meaning of "iron sulfide"?

    • A. the French chemist who showed that, in a reaction, the atoms of the reactants aren't lost and no new atoms appear
    • B. a reaction of a substance with oxygen that releases heat and light
    • C. a change of state or shape that produces no new substance
    • D. the black solid formed when iron and sulfur are heated together
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    Answer: the black solid formed when iron and sulfur are heated together

    Explanation: Iron sulfide: the black solid formed when iron and sulfur are heated together

13. الفصل: Energy and Chemical Reactions · سهل

    13. Which term matches this definition: "a substance burned to release useful energy, such as wood, petrol or natural gas"?

    • A. cold pack
    • B. fuel
    • C. respiration
    • D. enzyme
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    Answer: fuel

    Explanation: Fuel: a substance burned to release useful energy, such as wood, petrol or natural gas

14. الفصل: Energy and Chemical Reactions · سهل

    14. What is the meaning of "catalyst"?

    • A. the decomposition of a substance by electrical energy
    • B. the slow exothermic reaction of glucose with oxygen in living cells that provides energy
    • C. a substance that speeds up a reaction without being used up
    • D. calcium oxide, which reacts with water in a strongly exothermic way
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    Answer: a substance that speeds up a reaction without being used up

    Explanation: Catalyst: a substance that speeds up a reaction without being used up

15. الفصل: Combustion and Pollution · سهل

    15. What is the meaning of "renewable energy"?

    • A. rain made acidic by sulfur dioxide and nitrogen oxides dissolved in it
    • B. energy from sources that do not run out, such as the sun, wind or water
    • C. burning with too little oxygen, giving carbon monoxide and soot
    • D. the three things needed for a fire: fuel, oxygen and heat
    أظهر الجواب ▾

    Answer: energy from sources that do not run out, such as the sun, wind or water

    Explanation: Renewable energy: energy from sources that do not run out, such as the sun, wind or water

المزيد من التدريب

هذه عيّنة فقط. تشمل دورة الكيمياء الكاملة للصف السابع على EduRise كل الفصول والدروس و832 الأسئلة والامتحانات المؤقّتة.

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