CHEM 135 1st Edition Lecture 12 Outline of Last Lecture I Integrated Rate Law a Graphs b Equations c Examples II Half life a Equations b Examples Outline of Current Lecture I Factors affecting the rate of a reaction a Concentration b Temperature c Surface area II Demo observations a Glow sticks b Blue solution c Corn starch Current Lecture Factors affecting the rate of a reaction 1 Concentration If there is an increase in the concentration there is an increase in the frequency of collisions 2 Temperature If there is an increase in temperature the frequency of collisions also increase 3 Surface area These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Among the colliding molecules only effective collisions i e collisions in right orientation and with right energy can lead to product formation Frequent collisions raise the rate of the reaction Collisions need sufficient energy to break reactant bonds DEMO Glow stick Has two chemicals separate at first when the glow stick is bent the chemicals react resulting in the glow One glow stick is placed into an ice bath the other is placed into hot water After a certain amount of time the glow sticks are observed o Ice bath glow stick has a low intensity glow o Hot water glow stick has a high intensity glow Blue solution There are four beakers containing a blue solution o Control beaker 5mL bleach at room temperature 25mL bleach at room temperature 5mL bleach less than room temperature 25mL of bleach causes the blue color to dissipate Higher temperature and 5mL of bleach causes for the color to disappear 5mL room temperature has color for the longest Cornstarch Cornstarch in petri dish and was held under flame did not catch fire Cornstarch was placed into a turkey baster and released in front of a propane torch resulted in a LARGE flame
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