Unit 5 lecture 2 Factors that affect Dissolving
- Slides: 7
Unit 5 lecture 2 Factors that affect Dissolving • If I want to make a substance dissolve in a liquid what could I do?
Unit 5 lecture 2 Factors that affect Dissolving • 4 main factors: Temperature, surface area, stirring, and pressure
Temperature: • At higher temperatures, the molecules move faster • solids/liquids dissolve FASTER (direct relationship) • gases dissolve slower (inverse relationship). • Example: cold soda is more fizzy than warm soda.
Surface Area • The smaller the pieces are, the more surface area is exposed. • Dissolving occurs at the surface of the substance. • As surface area increases, the rate of dissolving increases.
Stirring • Stirring brings solute particles into contact with solvent particles more often • As stirring increases, dissolving increases
Pressure • Pressure effects solubility of gases • As pressure increases, so does solubility. • This is because there are MORE collisions so more chances to dissolve
Tasty solution demonstration • Take three candies from the bag. Do NOT eat yet!!!! • Put ONE candy in your mouth. Do not move your tongue. Record how long it takes for the candy to dissolve. • Put the second candy in your mouth. This time, move your tongue around. Record how long it takes for the candy to dissolve. • Put the third candy in your mouth. This time, chew the candy. Record how long it takes for the candy to dissolve.
