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CollisionTheorySE

Explore how factors like temperature, concentration, surface area, and catalysts affect reaction rates in the Collision Theory Gizmo. Observe how reactants turn into products and learn what speeds up or slows down chemical reactions.

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    Gizmos P ame: Cate: Nov 23, 2(122 Student Exploration: Collision Theory Directions: Fellow the instructions to gothrough the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: activate: complex, catalyst, chemca reaction, concentration, enzyme, half-life, molecL e, product reactant surface area Prior Knowledge Questions (Do these BEFORE usirig the Gizmo.) 1. Suppose you added a spoonful of sugar to hot water and another to ice-ccld water. Which type cf rater 'will cause the sugar to dissolve more quickly? The hot water vxxild dissolve the sugar faster. 2. Suppose you held a lighted match to a solid hunk cf wood and another match to a pile of wood shavings. VWtioh farm of wood wil catch fire mere easily? The wood shavings catch on fire mere easily. 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 Goh liscn Theory Gizmc allows you to experiment v<ith several factors tnat affect , I the rate at which reactants are transformed hto products in a chemical react on. » I * You wil reed Hue. green . and orange markers or colored pencils for the first part of this activity. ; 1. Look at the key at the bottom of the SIMJLAT1ON pane. In the space below. draw f ) the two reactants and two products of this chemical reaction. Reactants: Products: Re.* !# I B :. Click Play f » ). What do you see?

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    Reactant A co des with reactant E which is cn the right side vic-rating against ihe side. Activity A: Temperature Get the Gzmo ready: - Click Reset { Z ). • Check drat the Reactant concentration is set Io 1.0 mol'L, the Catalyst concentration is set to 0.0C moL L, and the Surface area is M i n i m u m 4* •t A A A Question: Hew does temperature affect the rate of a chemical reaction? 1. Gbsenra Select the ANIMATION tab. View the animation withNc catalyst selected. What do you see? The reactants colide and farm product A and B. W"en two reactantmolecules meet. they farm a temporary structure called anactivated complex The activated complex breaks up into the product molecules. 2. Ctiserve: Return to the CONTROLS pane. Set 1heTemperature to 0 : C and the Simulation speed to its maximum setting. QickPlay. A Cescrbe the motions of the molecules. Reactants A are moving around and colliding with reactant B. Reacting B is vibrating on the side. E. Now set tne Temperature tc 2Q0 : C. How does increasing the temperature affect tne motions of the molecules? Reactants A are moving around and colliding with reactant B. Reacting B is vibrating on the side. Reactants move faster. C. Wiat do you notice atcut the chemical reaction a: the higher temperature? Motion and rate of reaction decreases as temperature is increases 3. Imerprat: Select the GRAPH tab. Click the zoom out tuttori (-} until you can see the whole graph. Wiat does this graph show? The graph s h o w the concentration of reactants and products over time. 4. Predict How do you think temperature will affect the rate cf a chemical reaction?

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