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Rates of Reactions

Rates of Reactions. Make-up lab Don’t click through the animations too fast! Take your time and make sure the animation is finished before you click again. Collision Theory. Add heat Stirring/shaking Increased Surface Area Increased Concentration Catalyst.

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Rates of Reactions

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  1. Rates of Reactions Make-up lab Don’t click through the animations too fast! Take your time and make sure the animation is finished before you click again.

  2. Collision Theory

  3. Add heat Stirring/shaking Increased Surface Area Increased Concentration Catalyst So how do we speed up a reaction? On the left is a list of ways to speed up a reaction; on the right are ways to slow down a reaction. • Remove heat • Let it sit • Decrease Surface Area • Decrease Concentration • No Catalyst

  4. Heat Increasing the heat energy will make the molecules move faster = faster collisions

  5. Shaking/ Stirring • Adding mechanical energy to the reaction can also increase the speed of the molecules = faster collisions!

  6. Increasing Surface Area • More surface area = more space for collisions

  7. Change the Concentration • A ratio of the amount of one substance verses the other substance(s). Increase the concentration of one = more possible collisions. Lower Concentration Higher Concentration

  8. Catalyst • Involves using a separate substance added to the reaction to speed it up. Hydrogen Fuel Cell

  9. Experiment!

  10. 250 200 150 100 50 Control Test Alka-Seltzer Tablet Beaker with cold temperature water

  11. 250 200 150 100 50 Heat Test Alka-Seltzer Tablet Beaker with HOT temperature water

  12. 250 200 150 100 50 Stirring/Shaking Test Alka-Seltzer Tablet Beaker with cold temperature water

  13. 250 200 150 100 50 Increased Surface Area Test Alka-Seltzer Tablet Beaker with cold temperature water

  14. 250 200 150 100 50 Changed Concentration Test Alka-Seltzer Tablet Beaker with cold temperature water

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