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Rate of Dissolving. A _________ dissolves in a _________ to form a ___________. video. Allergies?. May contain traces of: Peanuts Eggs Wheat. mmm Chocolate Science. mmm Chocolate Science. 1. The chocolate ______________________ in the saliva in your mouth to form a _______________ - PowerPoint PPT Presentation
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Rate of Dissolving
A _________ dissolves in a _________ to form a ___________
video
Allergies?
• May contain traces of:• Peanuts• Eggs• Wheat
mmm Chocolate Science
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 _____________________
Factors Affecting How Fast a Solute Dissolves
1. Temperature
2. Stirring or Shaking
3. Crushing (Surface Area)
4. Pressure
1. Temperature
If we heat particles they will move faster• The solvent will carry the solute particles away faster
So…
Hotter = Dissolve Faster
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!
So…
Stir or Shake = Dissolve Faster
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!
Dissolving happens on the surface of particles
• When solute is broken up, there is more surface area where dissolving can occur
broken up
4. Pressure
Pressure forces gas particles into the spaces between the liquid particles
Pressure is used to dissolve carbon dioxide gas in liquid pop
gas
So…
More pressure = Dissolve Faster
Pressure
Altitude Sickness and Nitrogen Narcosis (“The Bends”)
Video
Heterogeneous materials - can see two parts
Matter
Homogeneous materials can see only one
thing - one set of properties
Homogeneous mixtures
They’re mixed together so well you only see one thing – it looks pure
but it isn’t
Pure substancesYou can only see one thing because there is only one kind of particle in
it.
Mechanical Mixture
Solution – made when a solute dissolves in a
solvent
- Temperature, Stirring, Particle Size and Pressure
speed this up the dissolving rate