Multiple Choice
Which of the following factors does NOT affect the rate of a chemical reaction?
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15. Chemical Kinetics
Factors Influencing Rates
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Which of the following factors will cause a solid solute to dissolve faster in a solvent?
A
Decreasing the surface area of the solute
B
Using a solvent with lower polarity
C
Increasing the temperature of the solvent
D
Stirring the solution less frequently
Verified step by step guidance1
Understand that the rate at which a solid solute dissolves in a solvent depends on factors that increase the interaction between solute and solvent particles.
Recognize that increasing the surface area of the solute (e.g., by crushing it) exposes more solute particles to the solvent, which speeds up dissolution; therefore, decreasing surface area would slow it down.
Know that using a solvent with polarity similar to the solute generally increases solubility and dissolution rate; using a solvent with lower polarity than the solute usually decreases the rate.
Recall that increasing the temperature of the solvent typically increases the kinetic energy of molecules, leading to faster movement and more frequent collisions between solute and solvent particles, thus speeding up dissolution.
Understand that stirring the solution more frequently helps distribute solute particles throughout the solvent, increasing the rate of dissolution; stirring less frequently would slow it down.
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