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Determine which choice(s) is/are correct?

I. Stirring slows down (decreases) rate of dissolution.
II. Grinding solids increases their surface area of contact.
III. Heating slows down (decreases) rate of dissolution.
IV. Grinding solids speeds up their rate of dissolution.
Responses
A I, II, and IIII, II, and III
B II and IVII and IV
C I and IIII and III
D III and IV

1 answer

To analyze the statements:

I. Stirring slows down (decreases) rate of dissolution.

  • This statement is incorrect; stirring typically increases the rate of dissolution by allowing solute particles to disperse more quickly in the solvent.

II. Grinding solids increases their surface area of contact.

  • This statement is correct; grinding particles into smaller sizes increases the surface area available for dissolution.

III. Heating slows down (decreases) rate of dissolution.

  • This statement is incorrect; generally, heating increases the rate of dissolution by providing energy to the particles, allowing them to break apart more easily.

IV. Grinding solids speeds up their rate of dissolution.

  • This statement is correct; by increasing the surface area, grinding allows more solute to come in contact with the solvent, facilitating a quicker dissolution.

Based on the analysis:

  • Statement II is correct.
  • Statement IV is correct.
  • Statements I and III are incorrect.

The correct response is B: II and IV.