Question

Name Desk Date _Laboratory Instructor 30 Pre-lab Questions Rates of Chemical Reactions II: Rate and Order of H2O2 Decomposition Before beginning this experiment in the laboratory, you should be able to answer the following questions. 1. What four factors may influence the rate of a reaction? 2. Assume that the rate law for a reaction is rate=AB. a) What is the overall order of the reaction? (b) If the concentration of both A and B are doubled, how will this affect the rate of the reaction? (c) What name is given to K? (d) How will doubling the concentration of A, while the concentration of B is kept constant, affect the value of k (assume that temperature does not change)? How is the rate affected? 3. Define the term catalyst. 4. Write the chemical equation for the iodide-catalyzed decomposition of H202

Answer 1

Factors that could affect sale of reaction is i) Temprature ii) concentration of reactant iri) Catalyst iv) Type of reactant Generally with increasing temp the rate of an elimentary reaction increases because of more no. of activated molecule that can jump the energy beirries to reach to the transition state. Tis. Fa = activ energy Reactant Lepat Reaction condinates At higher temp more molecules will be having eneigh energy to cross the bursier. 11) concentration of reacting-a we know Rate & [A]n ne order of the reaction. A) = conc of reactant- ili) Catalyst - Catalyst alter the path of the reaction there by increasing / decreasing the activation energy to decrease/ nereare

the sake of reaction. iv) Type of Reactant: consider a vypothetical reaction CD + AB - Arct B-D So in order to get the pat the bonds between A-B and c-D needs to be broken. If they are weak and can easily be broken, then the reaction is faster and the reverse is also true. HES a Rate = K[t] (Bj 2 The ovena order of the reaction is equals to Sum of the powers of concentration teams, order = 1+2 3 6 when cone of A and B are doubled Rate = k 2A] (26] ² = 8K (1) [1]2 4. Rate Rate - 8 Rate = 8 so the rate increases by 8 times @k is called as rate constant which can be desired as date of reaction et unit concent.