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Rates of Reactions: Understanding Collision Theory in Make-up Lab

Explore how to speed up or slow down chemical reactions with heat, stirring, surface area, concentration, or catalysts in this interactive lab experiment. Discover the impact of different factors on reaction rates by conducting a hydrogen fuel cell experiment, manipulating temperature, stirring, and changing concentrations of reactants.

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Rates of Reactions: Understanding Collision Theory in Make-up Lab

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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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