Rate Law Main Concept The rate law shows
- Slides: 16
Rate Law Main Concept: The rate law shows how the rate depends on reactant concentrations.
Rate Law Defined Reaction Orders How to Determine Graphical Representations
- rate law: expresses rate of reaction as proportional to concentration of each reactant raised to a power - power of each reactant in rate law is order of reaction with respect to that reactant - sum of powers of reactant concentrations in rate law is overall order of reaction
- When rate is independent of concentration for a reactant, reaction is zeroth order for that reactant, since raising reactant concentration to power zero is equal to the reactant concentration being absent from rate law
- In cases where concentration of any other reactants remain essentially constant during reaction, the order of a reaction with respect to a reactant concentration can be inferred from plots of concentration of reactant versus time
Zeroth Order Reaction Negatively sloped straight line with [A]
First Order Reaction Negatively sloped straight line with ln [A]
Second Order Reaction Positively sloped straight line with 1/[A]
Zeroth Order First Order Second Order
Question: Looking at the “Kinetics” section of the reference pages available to you, what order are these two equations that are given to you? What might they allow you to do?
These are presented on your reference page in this order, so… [A]t – [A]0 = – kt 1 st order 0 th order 2 nd order
- method of initial rates is useful for developing conceptual understanding of what a rate law represents - Investigation of data for initial rates enables prediction of how concentration will vary as reaction progresses
Rate Constant Main Concept: The magnitude and temperature dependence of the rate of reaction is contained quantitatively in the rate constant.
- proportionality constant in rate law = rate constant, k - rate constant is a measurable quantity that characterizes a chemical reaction - Rate constants vary over many orders of magnitude because reaction rates vary widely
- temperature dependence of reaction rates is contained in temperature dependence of rate constant - For first-order reactions, half-life is often used as a representation for rate constant because they are inversely proportional, and half-life is independent of concentration. For example, radioactive decay processes
*** Half-life equation doesn’t work for zero or second order reactions Zero Order First Order Second Order
- When god shows up he shows off
- Future going to
- Tell more about the main idea
- Void main int main
- Hình ảnh bộ gõ cơ thể búng tay
- Slidetodoc
- Bổ thể
- Tỉ lệ cơ thể trẻ em
- Voi kéo gỗ như thế nào
- Tư thế worm breton là gì
- Chúa yêu trần thế alleluia
- Các môn thể thao bắt đầu bằng tiếng chạy
- Thế nào là hệ số cao nhất
- Các châu lục và đại dương trên thế giới
- Công thức tiính động năng
- Trời xanh đây là của chúng ta thể thơ
- Mật thư anh em như thể tay chân