2 Answers

In general, an increase in temperature increases the solubility of…

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CHEMISTRY

In general, an increase in temperature increases the solubility of a solute in water because

A. more solute molecules collide with each other

B. most solutes dissolve with the evolution of heat

C. more solute molecules dissociate at higher temperatures

D. most solutes dissolve with absorption of heat.

QUICK ANSWER…

C

DETAILS…  

At higher temperature, more solute particles tend to dissociate in solvents, this is because as temperature increases, the solvent molecules acquire more kinetic energy to force apart intermolecular attractions between the solute particles.

Now for the right answer to the above question:

  1. Option A is incorrect. collision of solute particles with each other has no relation with their solubility in another compound. Besides, collision mostly result in chemical changes and not just dissolution.
  2. Option B is incorrect. oil pollution does not desalinate waters. Unreasonable option.
  3. C is correct.
  4. D is not the correct answer. Mere restatement of question.
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KEY-POINTS…

You may please note these/this:

  • The key word here is “dissociate” and not just dissolve. At higher temperatures, solutes are empowered to firstly dissociate before dissolving.
  • Solute particles acquire more energy to dissociate, while the solution acquires more kinetic energy to force apart bonds in solutes.

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/ culled from 2015 JAMB-UTME Chemistry past question 18 /

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