| Term | Definition |
|---|
| How are rates of chemical change expressed? | amount of (reactant changing) per unit time |
| In a typical reation, as time passes, the amount of __?__ decreases and the amount of _?_increases | reactant and product |
| what does collision theory say about the energys of atoms, ions, or molecules reacting to form products when they collide? | They must have enough kinectic energy when they collide to form products |
| look on work sheet! #4 | work sheet #4 |
| (T or F) Particles lacking the necessary kinetic energy to react, bounce apart unchanged when they collide? | yup! |
| which arrangement of atoms contains the least amount of energy? | products |
| the minimum amount of energy that particles must have in order to react is called? | activation energy |
| an activated complex is the arrangement of atoms at the _?_ of the activation energy barrier. | peak |
| what term best describes the lifetime of an activated complex | 10(-13)s |
| why is an activated complex sometimes called the transiton state? | an activated complex is unstable and is likely to re-form reactants rather than products |
| changes in the rate of chemical reactions depend on conditions such as? | temperature, concentration and particle size |
| the main effect of increasing the temperature of a chemical reaction is to ___?___the number of particles that have enough kinetic energy to react when they collide | increase |
| what happens when you put more reacting particles into a fixed volume? | the concentration of reactants increases , so does the frequency, so the reaction rate increases.. |
| true or false?...the smaller the paricle size,,the larger the surface area of a given mass of particles | yup! |
| what are some way to increase the the surface area of solid reactants? | disolve the solid or grind it into a powder |
| A ____?____ is the substance that increases the the rate of reaction without being used up itself during the reaction. | Catalyst |
| What does a catalyst do? | permits reaction to proceed at lower energy than is normally required. It lowers the activation energy |
| look on worksheet | look on worksheet |
| what does the graph show about the effect of the catalyst on th rate of reaction? | the catalyst lowers the activation energy and of course the amount of energy required by the system |
| (in a chemical equation), how do you show that catalysts are not consumed or chemically altered during a reation? | it is written above the yield arrow in the equation |
| a ____?____ is a substance that interferes with the action of a catalyst? | inhibitor |
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