Questions on the Dissolving Process
Multiple Choice Questions – Dissolving Process
1. What is the first step in the dissolving process of a solid in a liquid?
A) Solute particles collide with air molecules
B) Solute particles absorb heat
C) Solvent particles surround solute particles
D) Solute particles separate from each other
E) Solute reacts chemically with the solvent
2. Which of the following best describes the process of dissolution?
A) A chemical reaction that forms a new substance
B) The solute breaking down into smaller molecules
C) A physical process where solute disperses evenly in solvent
D) A change of state from solid to gas
E) The decomposition of the solute
3. What kind of force must be overcome for a solid to dissolve in a liquid?
A) Magnetic forces between solute particles
B) Ionic bonding in the solvent
C) Intermolecular forces between solute particles
D) Nuclear forces
E) Thermal energy
4. What does the solvent do during the dissolving process?
A) Provides color to the solution
B) Reacts with solute to form a precipitate
C) Surrounds and separates solute particles
D) Becomes solid
E) Changes its identity
5. Which factor increases the rate of dissolution?
A) Decreasing temperature
B) Stirring the solution
C) Increasing particle size
D) Adding more solute to a saturated solution
E) Using nonpolar solvents only
6. Why does crushing a solid solute increase its rate of dissolution?
A) It releases heat
B) It changes its chemical identity
C) It increases the surface area
D) It increases solubility
E) It makes it magnetic
7. What type of change is the dissolving of salt in water?
A) Chemical change
B) Nuclear change
C) Physical change
D) Phase change
E) Exothermic reaction
8. Which term describes the uniform mixture formed after dissolving?
A) Suspension
B) Colloid
C) Solution
D) Emulsion
E) Compound
9. What happens to solute particles during the dissolving process?
A) They vanish completely
B) They settle at the bottom
C) They dissociate and disperse evenly
D) They rise to the top
E) They change into another element
10. The energy used to separate solute particles is called:
A) Vaporization energy
B) Solvation energy
C) Lattice energy
D) Bond enthalpy
E) Cohesion energy
11. The energy released when solvent surrounds solute particles is called:
A) Solvation energy
B) Activation energy
C) Melting energy
D) Ionization energy
E) Evaporation energy
12. If the solute–solvent attraction is stronger than solute–solute or solvent–solvent attractions, the solute will:
A) Not dissolve
B) Dissolve slowly
C) Dissolve easily
D) Precipitate
E) Change color
13. When no more solute dissolves and some remains undissolved, the solution is:
A) Diluted
B) Concentrated
C) Saturated
D) Unsaturated
E) Miscible
14. Stirring a solution helps it dissolve faster because:
A) It increases the solvent temperature
B) It adds more solvent
C) It distributes solute particles evenly
D) It removes solute
E) It lowers solubility
15. In a liquid solution, as temperature increases, solubility of most solid solutes:
A) Decreases
B) Stays constant
C) Increases
D) Drops to zero
E) Causes freezing
16. Which best defines solubility?
A) The amount of solvent that evaporates
B) The speed of stirring
C) The maximum amount of solute that can dissolve in a solvent at a given condition
D) The color of the solute
E) The energy required to boil a solution
17. What happens when a solution becomes supersaturated?
A) It evaporates completely
B) All solute crystallizes
C) It holds more solute than normally possible
D) It becomes heterogeneous
E) The solvent changes phase
18. Which of these does not affect the dissolving rate?
A) Stirring
B) Particle size
C) Temperature
D) Color of solute
E) Surface area
19. Which expression best describes dissolving based on polarity?
A) Like attracts unlike
B) Like dissolves like
C) Opposites attract
D) Polar avoids polar
E) Nonpolar dissolves in water
20. In the dissolving process, what is the role of entropy?
A) It decreases with mixing
B) It resists mixing of solute and solvent
C) It encourages disorder and helps solute mix
D) It prevents dissolution
E) It causes precipitation
Answers and Explanations
1. D – The first step is that solute particles separate from each other.
2. C – Dissolution is a physical process where solute disperses in solvent.
3. C – The solute must overcome intermolecular forces that hold its particles together.
4. C – Solvent particles surround and separate solute particles.
5. B – Stirring increases the rate by moving solvent around solute particles.
6. C – Crushing increases surface area, allowing more contact with solvent.
7. C – Dissolving is a physical change; the substance retains its identity.
8. C – A solution is a homogeneous mixture of solute and solvent.
9. C – Solute particles dissociate and disperse evenly in the solvent.
10. C – Lattice energy is the energy needed to separate solute particles.
11. A – Solvation energy is released as solvent surrounds solute particles.
12. C – Stronger solute–solvent attraction means solute will dissolve easily.
13. C – When no more solute dissolves, the solution is saturated.
14. C – Stirring distributes particles and helps fresh solvent contact solute.
15. C – For most solids, solubility increases with temperature.
16. C – Solubility is the maximum solute amount that can dissolve under set conditions.
17. C – A supersaturated solution holds more solute than it normally should.
18. D – The color of the solute does not affect dissolving rate.
19. B – “Like dissolves like” explains solubility based on polarity.
20. C – Entropy increases disorder, promoting the mixing of solute and solvent.
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