Lecture_Notes_090409b

Lecture_Notes_090409b - reactant molecules y Heterogeneous...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Rate Constant y k = zpe -(Ea/RT) y R = 8.3145 J/K*mol y T = Temperature in K y E a = activation energy y z = collision frequency with enough energy y p = fraction of collisions with correct orientation y k = Ae -(Ea/RT) y A = frequency factor = z and p combined
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Arrhenius Equation y Can use to get a different k at a new T if know E a or to get E a if know k at two T. Svante Arrhenius 1859 – 1927 Swedish Chemist Noble Prize 1903
Background image of page 2
Arrhenius Equation y Rate constants for the reaction: { NO 2(g) + CO (g) Æ NO (g) +CO 2(g) y are 1.3 M -1 s -1 at a temperature of 700 K and 23.0 M -1 s -1 at 800K. y What is the activation energy on kJ/mol?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Arrhenius Equation y What is the rate constant at 750 K?
Background image of page 4
Catalysis y Catalyst – a substance that speeds up a reaction; it is consume in one step and reproduced in another, it does not appear in the overall reaction y Homogeneous Catalyst – in the same phase as the
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: reactant molecules y Heterogeneous Catalyst in a different phase than the reactant molecules y Adsorption the collection of one substance on the surface of another substance y Absorption the penetration of one substance into another substance Catalysis y In the upper atmosphere, chlorofluorocarbons such as CFCl 3 absorb sunlight, and subsequent fragmentation produces Cl atoms. The Cl atoms participate in the following mechanism for the destruction of ozone: { Cl (g) + O 3 (g) ClO (g) + O 2 (g) { ClO (g) + O (g) Cl (g) + O 2 (g) y Write the chemical equation for the overall reaction. y What is the role of the Cl atoms in this reaction? y Is ClO a catalyst or a reaction intermediate? y What distinguishes a catalyst from and intermediate?...
View Full Document

Page1 / 6

Lecture_Notes_090409b - reactant molecules y Heterogeneous...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online