Physical and Chemical Changes Quiz - ICSE Class 8 Science

Free practice quiz: Physical and Chemical Changes (ICSE Class 8 Science). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 48 multiple-choice questions on Physical and Chemical Changes, and 48 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is an example of a physical change?

   1. Burning of wood
   2. Rusting of iron
   3. Melting of ice
   4. Digestion of food
   Show answer

   Answer: C. Melting of ice

   A physical change alters the form or appearance of a substance but not its chemical composition. Melting of ice is a change of state from solid to liquid, where water molecules remain H2O. Burning wood, rusting of iron, and digestion of food involve the formation of new substances, hence they are chemical changes.

2. Which of the following is an example of a chemical reaction that produces heat (exothermic)?

   1. Melting of ice
   2. Dissolving sugar in water
   3. Burning of fuel
   4. Evaporation of water
   Show answer

   Answer: C. Burning of fuel

   Burning of fuel, such as wood or natural gas, releases a significant amount of heat and light, indicating an exothermic chemical reaction. Melting, dissolving, and evaporation are typically processes that absorb heat (endothermic) or are neutral.

3. Which of the following processes releases energy (exothermic)?

   1. Melting of ice
   2. Photosynthesis
   3. Respiration
   4. Evaporation of water
   Show answer

   Answer: C. Respiration

   Respiration is the process by which organisms break down glucose to release energy for their life processes. This is an exothermic chemical reaction. Photosynthesis absorbs energy. Melting and evaporation absorb energy.

4. When a candle burns, wax is consumed, producing light, heat, carbon dioxide, and water vapor. This is:

   1. A physical change
   2. A reversible physical change
   3. A chemical change
   4. A change of state only
   Show answer

   Answer: C. A chemical change

   Burning of a candle is combustion, a chemical reaction where wax reacts with oxygen to form new substances like carbon dioxide and water vapor, releasing energy. This is an irreversible chemical change.

5. Which of the following is a characteristic of a chemical change?

   1. No new substance is formed.
   2. The change is usually reversible.
   3. Energy is absorbed or released.
   4. The physical state may change but chemical composition remains the same.
   Show answer

   Answer: C. Energy is absorbed or released.

   A key characteristic of chemical changes is the absorption or release of energy (heat, light, etc.) as bonds are broken and formed. New substances are formed, and the changes are typically irreversible.

More questions in this quiz

Answers and explanations are in the full quiz.

1. When iron reacts with oxygen and moisture, it forms rust. This is an example of:
2. Which of these processes involves the formation of a new substance?
3. A substance that can be easily reversed to its original state after a change is usually undergoing a:
4. Photosynthesis in plants is a process that results in:
5. Which of the following is NOT a characteristic of a chemical change?
6. Consider the process of making popcorn. The popping sound and the transformation of a hard kernel into a fluffy snack are indicative of:
7. When silver jewelry is exposed to air, it tarnishes and turns black. This is due to:
8. The process of evaporation of water is:
9. When an acid is mixed with a base, a neutralization reaction occurs, often producing salt and water. This is:
10. Breaking a glass into pieces is an example of:
11. Which of the following processes involves the formation of a precipitate?
12. Rusting of iron is accelerated by:
13. Which of the following is an example of a chemical change involving gas evolution?
14. The process of digestion of food in our stomach is:
15. When coal burns, it produces ash and gases. This is:
16. Which of the following is a change of state that is NOT considered a physical change?
17. When dough is baked, it changes color, texture, and becomes firm. This is an example of:
18. The change in an egg when it is boiled is best described as:
19. Which of the following observations would indicate a chemical change has occurred?
20. When wood is chopped into smaller pieces, this is:
21. Which of the following describes a substance that undergoes sublimation?
22. The process of ripening of fruits involves:
23. Which of the following is an example of a reversible chemical change?
24. The formation of clouds from water vapor is an example of:
25. Which of these processes involves the absorption of energy (endothermic)?
26. The process of electrolysis of water, where water is broken down into hydrogen and oxygen gases, is:
27. Which of the following is an example of a change that alters the composition of the substance?
28. When a strip of magnesium ribbon is heated in air, it burns with a bright white light, forming a white powder (magnesium oxide). This is:
29. Which of the following processes does NOT involve the formation of new substances?
30. The process of freezing water into ice is:
31. When iron reacts with dilute sulfuric acid, hydrogen gas is produced. This is:
32. Which of the following is an example of a change that is difficult to reverse?
33. The process of photosynthesis in plants is essential for life on Earth because it:
34. When water is heated to 100°C at standard atmospheric pressure, it boils and turns into steam. This is:
35. The rusting of iron is an electrochemical process that involves the reaction of iron with oxygen in the presence of water. This process results in the formation of:
36. When solid iodine is heated, it turns directly into a purple vapor without melting. Upon cooling, the vapor turns back into solid iodine. This process is called:
37. Which of the following is NOT a type of chemical change?
38. When a firecracker explodes, there is a loud sound, bright light, and the formation of smoke and ash. This is a clear example of:
39. The process of tarnishing of copper by reacting with moist carbon dioxide and oxygen in the air to form a green layer (copper carbonate) is:
40. Which of the following is an example of physical weathering?
41. The change that occurs when iron is magnetized is considered:
42. When food spoils, it changes color, smell, and taste. This indicates:
43. The process of dissolving salt in water is often accompanied by a slight decrease in temperature. This means the process is:

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