1. Rate of Dissolving

2. A _________ dissolves in a _________ to form a ___________
video

3. Allergies?
May contain traces of:
Peanuts
Eggs
Wheat

4. mmm Chocolate Science

5. mmm Chocolate Science Dissolving Time NOT moving tongue or chewing
Stir with your tongue
Chewing
1. The chocolate ______________________ in the saliva in your mouth to form a _______________
2. Solutions contain two parts: ________________________ & _______________________
3. In this lab, the solute is the ________________________, and the solvent is the __________________
4. Since the chocolate dissolved in your mouth we can say it was _____________________

6. Factors Affecting How Fast a Solute Dissolves
Temperature
Stirring or Shaking
Crushing (Surface Area)
Pressure

7. 1. Temperature If we heat particles they will move faster
The solvent will carry the solute particles away faster

8. Hotter = Dissolve Faster

9. 2. Stirring or Shaking
Stirring or shaking a solution moves the solute particles around so that they are closer to water particles
the water particles can then attract them easily and carry them away!

10. Stir or Shake = Dissolve Faster

11. 3. Crushing (Surface Area)
When a sugar cube is broken into small pieces, the individual sugar particles can get closer to water particles
the water particles can then attract them easily and carry them away!

12. Dissolving happens on the surface of particles
When solute is broken up, there is more surface area where dissolving can occur
broken up

14. 4. Pressure
Pressure is used to dissolve carbon dioxide gas in liquid pop
Pressure forces gas particles into the spaces between the liquid particles
gas

15. More pressure = Dissolve Faster

16. Pressure
Altitude Sickness and Nitrogen Narcosis (“The Bends”)
Video

17. Solution – made when a solute dissolves in a solvent
Matter
Heterogeneous materials - can see two parts
Homogeneous materials can see only one thing - one set of properties
Mechanical Mixture
Homogeneous mixtures
They’re mixed together so well you only see one thing – it looks pure but it isn’t
Pure substances
You can only see one thing because there is only one kind of particle in it.
Solution – made when a solute dissolves in a solvent
- Temperature, Stirring, Particle Size and Pressure speed this up the dissolving rate