Student Exploration: Collision Theory
Vocabulary: activated complex, catalyst, chemical reaction, concentration, enzyme, half-life, molecule, product, reactant, surface area
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Suppose you added a spoonful of sugar to hot water and another to ice-cold water. Which type of water will cause the sugar to dissolve more quickly?
2.Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?
A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction. The Collision Theory Gizmo™ allows you to experiment with several factors that affect the rate at which reactants are transformed into products in a chemical reaction.
You will need blue, green, and orange markers or colored pencils for the first part of this activity.
1. Click Play (). What do you see?
Question: How does temperature affect the rate of a chemical reaction?
1. Observe: Select the ANIMATION tab. View the animation with No catalyst selected. What do you see?
When two reactant molecules meet, they form a temporary structure called an activated complex. The activated complex breaks up into the product molecules
2.Observe: Return to the CONTROLS pane. Set the Temperature to 0 °C and the Simulation speed to its maximum setting. Click Play.