CHEM 1A03 Lecture Notes - Lecture 1: Arrhenius Equation, Collision Theory, Activation Energy

If a solution is 3% H_2O_2 by mass calculate its molarity. Assume the density is 1 g/mL. How does this molarity compare with the molarity of H_2O_2 determined in this experiment? A balloon is filled with a ratio of 2:1 of H_1 and O_2 gas. If left undisturbed no reaction takes place. A small flame or spark will cause a loud explosion, burning H_2 to produce H_2 O. a) Write the balanced equation for this reaction. b) Draw a reaction coordinate diagram showing the energy of the reactants, the products and the transition state. Clearly label the axis. C) Is the reaction exothermic or endothermic? d) Why do we need a spark or flame to get this reaction to go? The exponential factor, f = e^E_y/RT, in the Arrhenius equation, represents the fraction of collisions with sufficient kinetic energy to react. If the activation energy, E_y, for a reaction is 40 kJ/mol, calculate the fraction of collisions with sufficient energy to react at a) 25 degree C b) 65 degree C