Questions on Change of State of Matter
20 Multiple-Choice Questions: Change of State of Matter
🔹 Questions
1. Which of the following is the process of a solid turning into a liquid?
A) Condensation
B) Freezing
C) Evaporation
D) Melting
E) Sublimation
2. What is the name of the process in which a liquid becomes a gas?
A) Sublimation
B) Condensation
C) Melting
D) Freezing
E) Vaporization
3. The change from gas to liquid is known as:
A) Melting
B) Sublimation
C) Condensation
D) Deposition
E) Evaporation
4. Which process describes a gas turning directly into a solid?
A) Freezing
B) Condensation
C) Deposition
D) Melting
E) Sublimation
5. Sublimation is the direct change from:
A) Liquid to gas
B) Solid to gas
C) Gas to liquid
D) Solid to liquid
E) Liquid to solid
6. Which of these is an example of sublimation?
A) Water boiling
B) Ice melting
C) Dry ice disappearing
D) Steam condensing
E) Lava solidifying
7. What happens to the energy of particles during melting?
A) It decreases
B) It stays the same
C) It increases
D) It disappears
E) It becomes kinetic only
8. What state of matter is formed when a solid is heated enough to melt?
A) Gas
B) Plasma
C) Liquid
D) Ion
E) None
9. Boiling is a type of:
A) Sublimation
B) Evaporation
C) Condensation
D) Freezing
E) Deposition
10. During freezing, the kinetic energy of particles:
A) Increases
B) Disappears
C) Stays the same
D) Decreases
E) Is converted to potential energy
11. Which of these changes involves the absorption of heat?
A) Condensation
B) Freezing
C) Deposition
D) Melting
E) Solidification
12. Which of these is an exothermic change of state?
A) Melting
B) Vaporization
C) Sublimation
D) Condensation
E) Boiling
13. The term “latent heat” refers to:
A) Heat used to increase temperature
B) Heat stored in chemical bonds
C) Heat required for temperature to fall
D) Heat required for a phase change
E) Heat used to freeze materials
14. What happens to the temperature during a phase change?
A) It rises steadily
B) It falls steadily
C) It remains constant
D) It increases exponentially
E) It oscillates
15. Which state change involves particles becoming more ordered?
A) Melting
B) Vaporization
C) Condensation
D) Sublimation
E) Ionization
16. What type of matter has a definite volume but no definite shape?
A) Solid
B) Liquid
C) Gas
D) Plasma
E) Vapor
17. What process occurs when frost forms on a cold surface?
A) Melting
B) Condensation
C) Freezing
D) Deposition
E) Sublimation
18. Which of the following is a chemical change, not a change of state?
A) Evaporation
B) Condensation
C) Freezing
D) Combustion
E) Melting
19. What is required for a substance to change from a solid to a gas without passing through the liquid state?
A) Low temperature
B) High pressure
C) Decrease in kinetic energy
D) Sublimation
E) Condensation
20. What happens to intermolecular forces during vaporization?
A) They get stronger
B) They break down
C) They are unchanged
D) They multiply
E) They form new bonds
Extended Answers and Explanations
1. D) Melting
→ Melting is the process where a solid becomes a liquid due to heat.
2. E) Vaporization
→ Vaporization includes both evaporation and boiling (liquid to gas).
3. C) Condensation
→ Condensation is the cooling of gas into a liquid.
4. C) Deposition
→ Deposition is the direct change from gas to solid (opposite of sublimation).
5. B) Solid to gas
→ Sublimation bypasses the liquid state entirely.
6. C) Dry ice disappearing
→ Dry ice (solid CO₂) sublimes directly into gas at room temperature.
7. C) It increases
→ Melting requires absorption of heat, increasing particle energy.
8. C) Liquid
→ Heating a solid enough will convert it into its liquid form.
9. B) Evaporation
→ Boiling is a form of rapid vaporization throughout the liquid.
10. D) Decreases
→ Freezing reduces particle movement and energy.
11. D) Melting
→ Melting is an endothermic process (absorbs heat).
12. D) Condensation
→ Condensation releases heat, making it exothermic.
13. D) Heat required for a phase change
→ Latent heat is absorbed or released without changing temperature.
14. C) It remains constant
→ During a phase change, temperature stays the same while the phase changes.
15. C) Condensation
→ Gas particles become more ordered when they condense into a liquid.
16. B) Liquid
→ Liquids take the shape of their container but retain volume.
17. D) Deposition
→ Frost forms when water vapor turns directly into solid ice.
18. D) Combustion
→ Combustion is a chemical reaction, not a phase change.
19. D) Sublimation
→ Sublimation skips the liquid phase entirely.
20. B) They break down
→ During vaporization, intermolecular forces must be overcome.
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