# Chemsitry 101 - Kinetics

Flashcards by jennabarnes12387, updated more than 1 year ago
 Created by jennabarnes12387 over 7 years ago
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### Description

Chemistry 101 Chemistry 101 Flashcards on Chemsitry 101 - Kinetics, created by jennabarnes12387 on 12/07/2013.

## Resource summary

 Question Answer What is the objective of chemical kinetics? To measure the rate if reactions, how factors like concentration, temperature, and catalysts effect reaction rate, and determine the microscopic steps that transform reactants into products. What are the most important questions concerning chemical reactions? Can a reaction occur? And how fast does the reaction occur? Why might a reaction seem to not occur on its own accord? It happens at such a slow rate at that it may seem to not be happening at all What is the definition of the rate of a chemical reaction? Change in concentration of a product or reactant over a unit of time e.g. Moles/L per s. What is the average rate of reaction for a specific substance over time? End concentration of a substance minus the initial concentration of a substance divided but the end time minus the initial time What is the rate of disappearance of a substance that decreases in concentration? Negative change in concentration of A divided by change in time What is the rate of a appearance (a concentration that increases) Negative change in concentration of B divided by change in time Rate of reaction simplified is? 1/x X rate of appearance or disappearance of a substance. x is the coefficient for the species in the balanced equation If you are given reaction rate fora full reaction, how to fine the rate of increase or decrease of a specific substance? 1/the coefficient x rate of appearance/disappearance equation = the given reaction rate. From here just time the given reaction rate by the species coefficient to find the species rate of reaction Why does rate of reaction decreases with time? Because the rate of reaction depends on the concentration of the reactants. As they react there concentration decreases so the reaction rate will also decrease. How do you calculate the averaged rate of reaction? The end time - initial time = negative change in concentration divided by change in time How do you find the half life of a first order reaction T1/2 = 0.693/K How do you find the time it takes for a substance to decompose to a certain percent First find the value of k for whatever order the reaction is. Then solve for t with the equation natural log of substance concentration at a certain time divided by concentration of a substance at 0 time = -k(t). Remember the concentration ratio is actually equal to what percent is left over. For example if u want to find the time for a substance to decompose 95% u sub statue 0.05 for the concentration ratio How do you calculate the time of reaction for a second order reaction? 1/final concentration - 1/initial concentration = k x t

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