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“Reaction Rates”

This review explores the concept of reaction rates as defined by the collision theory, highlighting how reactions vary in speed from very fast, like firecrackers, to very slow, such as coal formation. The rate of a reaction is influenced by factors such as temperature, surface area, concentration, and pressure. Additionally, the role of catalysts and inhibitors in speeding up or slowing down reactions is discussed. Identifying evidence of chemical reactions such as color and temperature changes, gas production, and solid formation is also covered.

nigel-tillman
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“Reaction Rates”

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  1. “Reaction Rates” Review of Alka Seltzer Lab

  2. Collision Theory • Reactions can occur: • Very fast – such as a firecracker • Very slow – such as the time it took for dead plants to make coal • A “rate” is a measure of the speed of any change that occurs within an interval of time

  3. Collision Model • Key Idea: Molecules must collide to react.

  4. Factors Affecting Rate • Temperature • Increasing temperature always increases the rate of a reaction. • Surface Area • Increasing surface area increases the rate of a reaction • Concentration • Increasing concentration USUALLY increases the rate of a reaction • Presence of Catalysts: • Pressure Increasing the pressure increases the rate of the reaction.

  5. Catalysts • Catalyst: A substance that speeds up a reaction, without being consumed itself in the reaction • Inhibitors – interfere with the action of a catalyst; reactions slow or even stop

  6. Evidence of a Chemical Reaction:color changeodor changetemperature changebubbles or gas productionsolid formation

  7. http://player.discoveryeducation.com/index.cfm?guidAssetId=E73FFA0F-977F-4574-8688-DC1CB551ECD9&blnFromSearch=1&productcode=UShttp://player.discoveryeducation.com/index.cfm?guidAssetId=E73FFA0F-977F-4574-8688-DC1CB551ECD9&blnFromSearch=1&productcode=US

  8. http://player.discoveryeducation.com/index.cfm?guidAssetId=373BFC67-1589-46B0-9E45-8E6EA5304C91&blnFromSearch=1&productcode=UShttp://player.discoveryeducation.com/index.cfm?guidAssetId=373BFC67-1589-46B0-9E45-8E6EA5304C91&blnFromSearch=1&productcode=US

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