أسئلة تدريبية في الكيمياء – الصف الثامن – المنهج اللبناني

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سجّل على edurise.me واشترك (10 دولارات شهرياً) لتتدرّب على كل فصول الكيمياء للصف الثامن، وتقدّم الامتحانات المؤقّتة وتتابع تقدّمك.

Question 1

What is the meaning of "distilled water"?

Accepted Answer

pure water obtained by distillation, containing no dissolved salts. Distilled water: pure water obtained by distillation, containing no dissolved salts

Question 2

Which term matches this definition: "a graph of the temperature of a substance against time while it is heated"?

Accepted Answer

heating curve. Heating curve: a graph of the temperature of a substance against time while it is heated

Question 3

What is the meaning of "chemical symbol"?

Accepted Answer

one or two letters representing an element (H, O, Cl, Fe). Chemical symbol: one or two letters representing an element (H, O, Cl, Fe)

Question 4

Which term matches this definition: "the number written in front of a formula that counts molecules"?

Accepted Answer

coefficient. Coefficient: the number written in front of a formula that counts molecules

Question 5

Which term matches this definition: "the polyatomic cation NH₄⁺"?

Accepted Answer

ammonium ion. Ammonium ion: the polyatomic cation NH₄⁺

Question 6

Which term matches this definition: "a neutral solid made of cations and anions arranged in a regular network"?

Accepted Answer

ionic compound. Ionic compound: a neutral solid made of cations and anions arranged in a regular network

Question 7

Which term matches this definition: "the principle that atoms are only rearranged, never created or destroyed, in a reaction"?

Accepted Answer

conservation of atoms. Conservation of atoms: the principle that atoms are only rearranged, never created or destroyed, in a reaction

Question 8

8 g of dihydrogen react completely with 24 g of dioxygen. Mass of water formed?

Accepted Answer

32. Conservation of mass: 8 + 24 = 32 g.

Question 9

Which term matches this definition: "a reaction in which two compounds exchange their ions"?

Accepted Answer

double replacement reaction. Double replacement reaction: a reaction in which two compounds exchange their ions

Question 10

What is the meaning of "thermal decomposition"?

Accepted Answer

a decomposition caused by heating. Thermal decomposition: a decomposition caused by heating

Question 11

Which term matches this definition: "a graph of the volume of gas produced against time, used to follow a reaction"?

Accepted Answer

volume–time curve. Volume–time curve: a graph of the volume of gas produced against time, used to follow a reaction

Question 12

What is a catalyst?

Accepted Answer

a substance that speeds up a reaction without being consumed. It is recovered unchanged at the end.

Question 13

Which is more acidic: drain cleaner (sodium hydroxide) (pH 14) or milk (pH 6.5)?

Accepted Answer

milk. The lower the pH, the more acidic.

Question 14

Which term matches this definition: "the OH⁻ ion responsible for basic properties"?

Accepted Answer

hydroxide ion. Hydroxide ion: the OH⁻ ion responsible for basic properties

Question 15

What is the meaning of "insoluble salt"?

Accepted Answer

a salt that does not dissolve in water, such as calcium carbonate or silver chloride. Insoluble salt: a salt that does not dissolve in water, such as calcium carbonate or silver chloride

أسئلة الكيمياء الصف الثامن مع الحل

15 سؤالاً تدريبياً في الكيمياء – الصف الثامن

1. What is the meaning of "distilled water"?

2. Which term matches this definition: "a graph of the temperature of a substance against time while it is heated"?

3. What is the meaning of "chemical symbol"?

4. Which term matches this definition: "the number written in front of a formula that counts molecules"?

5. Which term matches this definition: "the polyatomic cation NH₄⁺"?

6. Which term matches this definition: "a neutral solid made of cations and anions arranged in a regular network"?

7. Which term matches this definition: "the principle that atoms are only rearranged, never created or destroyed, in a reaction"?

8. 8 g of dihydrogen react completely with 24 g of dioxygen. Mass of water formed?

9. Which term matches this definition: "a reaction in which two compounds exchange their ions"?

10. What is the meaning of "thermal decomposition"?

11. Which term matches this definition: "a graph of the volume of gas produced against time, used to follow a reaction"?

12. What is a catalyst?

13. Which is more acidic: drain cleaner (sodium hydroxide) (pH 14) or milk (pH 6.5)?

14. Which term matches this definition: "the OH⁻ ion responsible for basic properties"?

15. What is the meaning of "insoluble salt"?

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