Collision_theory_gizmo.docx - Student Exploration Collision...

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Student Exploration: Collision Theory Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. 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? The type of water that will cause the sugar to dissolve more quickly is hot. 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? The form of wood that will catch fire more easily is wood shavings. Gizmo Warm-up 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. Look at the key at the bottom of the SIMULATION pane. In the space below, draw ( ) the two reactants and two products of this chemical reaction. Reactants: Products: 2. Click Play ( ). What do you see? I see reactants merging and shifting around to form the products. Activity A: Temperature Get the Gizmo ready : Click Reset ( ). Check that the Reactant concentration is set to 1.0 mol/L, the Catalyst concentration is set to 0.00 mol/L, and the Surface area is Minimum . 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? I see two merge together, transfer the central atom and detach. 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 . A. Describe the motions of the molecules. In reactant A the molecules shift around but they don’t merge with reactant B.
B. Now set the Temperature to 200 °C. How does increasing the temperature affect the motions of the molecules?

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