Questions and Answers
Crushed table salt at room temperature dissolves _____ rock salt.
faster than
As the temperature rises, the rate of solubility of salt in water ____________.
increases
If you stir a solute into a solvent, ________.
the solute will dissolve more quickly
Which of the following best explains why powdered KBr dissolves faster than large crystals of potassium bromide in 30°C water?
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Which of the following increases the rate of solubility of a solid sample because of the increase in temperature?
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At what temperature will Aarti's solution dissolve the fastest?
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Increasing the surface area increases the rate of solubility of a solid since:
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Why does heating a solvent have an effect on dissolving rate?
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The rate of dissolving ultimately depends on _____.
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Heating a solution increases the _____ of collisions between solute and solvent.
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Which sample will dissolve faster: 5 g of cubed sugar in 25°C water or 5 g of powdered sugar in 10°C water?
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True or false: The solubility of table salt in water will be greater in ice water.
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Study Notes
Rate of Dissolving Factors
- Crushed table salt dissolves faster than rock salt due to increased surface area exposure to solvent.
- Rising temperature enhances the solubility of substances like salt in water, making it easier to dissolve.
- Stirring a solute into a solvent accelerates the dissolving process by promoting contact between the two.
Surface Area and Dissolving
- Powdered potassium bromide dissolves quicker than large crystalline KBr because it provides a larger surface area for water interaction.
- Increasing a solid's surface area allows more molecules to interact with the solvent, thus increasing the rate of solubility.
Impact of Temperature
- Heating the solvent is a significant factor in increasing the dissolving rate.
- Higher temperatures lead to increased kinetic energy in particles, which enhances the frequency and force of collisions between solute and solvent.
Experimental Design Considerations
- In an experiment with different water temperatures (7°C, 34°C, 58°C, and 62°C), the highest dissolving rate is observed at 62°C.
Collision Dynamics
- The effectiveness of dissolving relies heavily on solute-solvent collisions; more collisions equate to a faster dissolving process.
Understanding Solubility in Context
- Heating a solution generally increases the speed of molecular interactions, thereby promoting faster dissolution of solutes.
- Solubility comparison shows that table salt dissolves less in ice water compared to warmer conditions, indicating that colder temperatures hinder solubility.
Comparison Scenarios
- When comparing two sugar samples (cubed vs. powdered, different temperatures), not enough information is provided to definitively determine which will dissolve faster without specific conditions about contact and collision rates.
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Description
Test your knowledge on the rate of dissolving in chemistry with these flashcards from Chapter 13. Explore concepts such as the effects of temperature and stirring on solubility. Perfect for reinforcing your understanding of key principles in physical chemistry.
