Lab 5.1 Making a solution.

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Presentation transcript:

Lab 5.1 Making a solution

Solute and Solvent http://www.chem4kids.com/files/art/matter_solu_2.jpg

Hot Chocolate Cocoa powder is mixed with hot milk. Which is the solvent? Cocoa powder OR Hot milk

Hot Chocolate Hot milk Cocoa powder is mixed with hot milk. Which is the solvent? Hot milk

Before Dissolving Sugar Particles are Strongly attracted to each other (held in fixed positions) Sugar surrounds sugar

After Dissolving Sugar Particles are now attracted to water particles (s-s attractions were broken) Water surrounds sugar

Energy and Dissolving It takes WORK to break the strong attractions sugar molecules have for each other. ENERGY TRANSFER = WORK DONE Water particles are moving around and have KE. When they collide with the sugar cube they transfer KE to the sugar particles. If the collision is hard enough, some sugar molecules break away. More KE = more collisions and harder collisions = more energy transferred = attractions are broken quicker = dissolves faster