Rate of Dissolving

A _________ dissolves in a _________ to form a ___________ video

Allergies? May contain traces of: Peanuts Eggs Wheat

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 substances You 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